Answer:
I think the answer is D.
Step-by-step explanation:
[tex] \frac{ {5y}^{3} }{ {(5y)}^{ - 2} } \\ = \frac{ {5y}^{3} }{ {(\frac{1}{5y})}^{2} } \\ = {5y}^{3} \times {25y}^{2} \\ = 125 {y}^{5} [/tex]
A statistics student at a small liberal arts college who is curious about the relationship between the amount of time students at his college spend on social networking sites and their performance at school decides to conduct a survey. Four research strategies for collecting data are described below. In each, name the sampling method proposed and any bias you might expect. Strategy 1: He obtains a list of the 1500 students at the college. He chooses a random number k between 1 and 15 and then samples that person and every kth person on the list. He emails the survey to each of the people in the sample and asks them to complete it by next Friday
1. What is the sampling method?
A. Simple random sampling
B. Convenience sampling
C. Cluster sampling
D. Systematic sampling
E. Stratified sampling
2. What type of bias would you expect? (check all that apply)
A. No bias in this survey
B. Response bias
C. Selection bias
D. Nonresponse bias Strategy
2: He gives out the survey only to his friends, and makes sure each one of them fills out the survey
3. What is the sampling method?
A. Simple random sampling
B. Convenience sampling
C. Cluster sampling
D. Systematic sampling
E. Stratified sampling
4. What type of bias would you expect? (check all that apply)
A. Selection bias
B. Nonresponse bias
C. No bias in this survey
D. Response bias Strategy
3: He randomly chooses 3 floors of the largest dorm on campus and distributes a paper survey to each resident on those floors. He places a box in the common room of the dorm to collect the completed surveys
5. What is the sampling m ethod?
A. Stratified sampling
B. Cluster sampling
C. Simple random sampling
D. Convenience sampling
E. Systematic sampling
6. What type of bias would you expect? (check all that apply)
A. Response bias
B. Nonresponse bias
C. No bias in this survey
D. Selection blas
7. Which strategy will give him the most representative sample of students at his college?
A. Strategy 1
B. Strategy 2
C. Strategy 3
Answer:
Strategy 1:
I) D: Systematic Sampling
II) D: non - response bias.
Strategy 2:
I) B: Convenience Sampling
II) A: Selective bias
Strategy 3:
I) B: Cluster Sampling
II) B: non - response bias.
7) A: Strategy 1
Step-by-step explanation:
For Strategy 1,
I) the sampling method is systematic sampling. This is because Systematic sampling is a kind of method for probability sampling whereby sample members from a larger population will be selected according to a random starting point but it will be for a fixed or periodic interval.
Now, we were told that he chooses a random number k between 1 and 15 and then samples that person and every kth person on the list. This corresponds to a random starting point as shown in systematic sampling above.
We are also told that he emails the survey to each of the people in the sample and asks them to complete it by next Friday. This corresponds to a fixed time interval in the definition too. Thus, it is proven to be systematic sampling.
II) The bias here will be Nonresponse bias Strategy. This is because all the students may not respond to the survey as it is possible that the students may forget to fill the survey or may ignore it or may be too busy to reply. Thus, it is a non - response bias.
For Strategy 2: He gives out the survey only to his friends, and makes sure each one of them fills out the survey
I) The sampling method here is convenience sampling which can be defined as a sampling method where the sampling units are selected in line with how convenient it is for the researcher. In this case he has given it to only his friends and made sure they filled. Which means he did it with a convenience bias.
II) Because he gave it to only his friends, he may not have a true reflection of the research as it was inky his friends instead of being random where he can have diverse views that can truly represent the population. Thus, it is a selection bias.
For strategy 3;He randomly chooses 3 floors of the largest dorm on campus and distributes a paper survey to each resident on those floors. He places a box in the common room of the dorm to collect the completed surveys.
I) The type of sampling used here is cluster sampling which is defined as a sampling method where the population is divided into clusters and random sample picked from each cluster. In this case, the population has been divided into 3 floors and he randomly distributed to residents on each of those floors. Thus, it is an example of Cluster sampling
II) The bias here will be non - response bias because the could choose not to respond to the paper survey for various reasons and thus not all will respond. This leads to a non - response bias.
7) Strategy 1 will give the most representative sample of students at his college because he selected from the entire list of 1500 students.
You took a trip to the mountains and traveled 486.It took you 9 hours and 18 gallons of gas to make the trip. The total cost you paid for was $59.94
Answer:
Average speed on the trip (54 miles per gallon)
Car mileage on trip was 27 miles per gallon
Unit price of gas paid ( $3.33)
Step-by-step explanation:
Vaughn paints his porch floor and also the porch floors of 9 neighbors. Each floor is a rectangle that is 8.4 feet long and 6.9 feet wide.
Answer:
579.6 ft²
Step-by-step explanation:
10(8.4×6.9)
Answer:
521.64
Step-by-step explanation:
first you do 8.4 times 6.9 which gets you 57.96 and then you multiply that my 9 which gets you 521.64.
definition of the difference quotient of a function
Answer:
Step-by-step explanation:
The difference quotient is a measure of the average rate of change of the function over an interval (in this case, an interval of length h). The limit of the difference quotient (i.e., the derivative) is thus the instantaneous rate of change.
what is the solution for the following equation? 3(a-7)=14-4a
Answer:
a= 5
Step-by-step explanation:
3 (a-7)= 14-4a -Remove Parentheses
3a-21=14-4a -Move the terms
3a+4a=14+21 -Collect like terms
7a=35 -Divide both sides
a=5 - Solution
(30 points!)
determine which lines are parallel??
Answer:
looks like the parallel lines are "l" and "n"
Step-by-step explanation:
when two lines are parallel, they should be across from each other going the same way. For example: / / , or \ \ sometimes even on top of each other. It can't be line "m" because it seems a little slanted. Parallel lines have to be the same length and same size. It can't be line "t" because the line is going in a different direction.
Simplify the following equation. 4x + 2 = 8x - 5
Answer:
1.75= X
Step-by-step explanation:
4x+2=8x-5
-4x -4x
2=4x-5
+5 +5
7=4x
divide by 4
1.75=x
Mark brainilst plzzz
Hahaha A little help? Plss
Answer:
Step-by-step explanation:
6/58=3/29
Answer:
3/29
Step-by-step explanation:
$182 at 6% simple interest for 4 years.
Find the interest earned on the account
Write the equation in slope intercept form. -4x + 4y = 16
Answer:
y = x + 4
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c
Given
- 4x + 4y = 16 ( add 4x to both sides )
4y = 4x + 16 ( divide all terms by 4 )
y = x + 4 ← in slope- intercept form
In the year 2004, a survey was undertaken to find whether citizens of a certain political party supported their party's candidate for governor. In a sample of 300 citizens of this party, 95% of them expressed support for their party's candidate. A similar survey was conducted four years later and showed that 91% of a sample of 350 citizens of this party expressed support for their party's candidate. Construct a 95% confidence interval for the difference in population proportions of citizens of this party who supported their gubernatorial candidate in 2004 and citizens of this party who supported their gubernatorial candidate four years later. Assume that random samples are obtained and the samples are independent. (Round your answers to three decimal places.) z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576
Answer:
The 95% confidence interval for the difference in population proportions is (0.001, 0.079).
Step-by-step explanation:
The (1 - α)% confidence interval for the difference in population proportions is:
[tex]CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha /2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}[/tex]
The information provided is as follows:
[tex]\hat p_{1}=0.95\\\hat p_{2}=0.91\\n_{1}=300\\n_{2}=350\\[/tex]
The critical value of z for 95% confidence level is 1.96.
Compute the 95% confidence interval for the difference in population proportions as follows:
[tex]CI=(\hat p_{1}-\hat p_{2})\pm z_{\alpha /2}\times\sqrt{\frac{\hat p_{1}(1-\hat p_{1})}{n_{1}}+\frac{\hat p_{2}(1-\hat p_{2})}{n_{2}}}[/tex]
[tex]=(0.95-0.91)\pm 1.96\times\sqrt{\frac{0.95(1-0.95)}{300}+\frac{0.91(1-0.91)}{350}}\\\\=0.04\pm 0.0388\\\\=(0.0012, 0.0788)\\\\\approx (0.001, 0.079)[/tex]
Thus, the 95% confidence interval for the difference in population proportions is (0.001, 0.079).
Find all integer solutions to the equation 91x + 329y = 49.
Answer:
dont waste points get wolfframAlpha
what is 3 + 2x = -6x + 4
Answer:
x = 1/8
Step-by-step explanation:
Please help on this I’m confused
Answer:
Side A is 7
Side B is 15
Step-by-step explanation:
when your cousin was born, she was 21 4/5 inches long. when your friends was born he was 21 3/4 inches long. who was longer at birth? how much longer?
cousin
1/20 inches
Step-by-step explanation:Hi there !
cousin
21 4/5 = (21×5+4)/5 = 109/5
friend
21 3/4 = (21×4+3)/4 = 78/4
lcm(4 ; 5) = 20
⁴⁾109/5 = 436/20 (cousin)
⁵⁾87/4 = 435/20 (friend)
436/20 > 435/20
cousin > friend
436/20 - 435/20 = 1/20 inches longer (cousin)
Good luck !
Order the following numbers from least to greatest. Put the lowest number on the left. 50 25 0 -75
Answer:
-75 0 25 50
Step-by-step explanation:
Simplify
3(5x + 4y) + 6(y - 2x)
Answer:
3x+18y
Step-by-step explanation:
Distribute into 15x+12y+6y-12x then add like terms.
Which of the following statements about developing a personal fitness program is NOT true?
A. When developing a personal fitness program, it is important to implement strategies that will help
maintain the program as well as give it a successful start.
B. Personal factors such as age, health concerns, and likes are important to consider when
developing a personal fitness program.
C. The starting skill level of the physical activities included in a personal fitness program should be
determined from other individuals' fitness programs.
D. The FITT principle should be used when developing a personal fitness program.
Answer:
C.
Step-by-step explanation:
what is -3(2u-3w-4)
please answerr
Answer:
-6u +9 w +12
Step-by-step explanation:
Please help me I need it right now
Answer: x = 4
Step-by-step explanation:
The cube root of 64 is 4
Answer: x=4
Step-by-step explanation:
4x4=16. 16x4=64
Which is an equation of the line with slope 2 that passes through (3, 1)? Ay-1 = 2(x-3) By + 1 = 2(x + 3) Cy-3 = 2(x - 1) Dy- 3 = (x - 2)
Answer:
A
Step-by-step explanation:
The equation of a line in point- slope form is
y - b = m(x - a)
where m is the slope and (a, b) a point on the line
Here m = 2 and (a, b) = (3, 1 ), thus
y - 1 = 2(x - 3) → A
The equation of the line with slope 2 that passes through (3, 1) is [tex](y-1)=2(x-3)[/tex] and this can be determined by using the one-point slope form.
Given :
The line with slope 2 that passes through (3, 1).
The following steps can be used in order to determine the equation of the line with slope 2 that passes through (3, 1):
Step 1 - The one-point form of the line can be used in order to determine the equation of the line with slope 2 that passes through (3, 1).
Step 2 - The equation that shows one-point form is given below:
[tex](y-y_1)=m(x-x_1)[/tex]
where m is the slope and [tex](x_1,y_1)[/tex] is the point on the line.
Step 3 - Substitute the values of the known terms in the above equation.
[tex](y-1)=2(x-3)[/tex]
Therefore, the correct option is A).
For more information, refer to the link given below:
https://brainly.com/question/11897796
Of the 50 students in mr motchells classes 60% are girls on friday 20% of the girls in the classes wore jeans how mnay girls wore jeans
Answer:it would be 20
Step-by-step explanation:
Answer: 20.
Step-by-step explanation: 60% of 50 is 30 (students). 20% of it would be 20 (students).
Please I need some answers one or two are fine
Answer:
A. 10,000
B. 1,000,000
C. 10,000,000,000
D. 1,000,000,000,000
Step-by-step explanation:
10,000/ 10∧4 = 1
1,000,000/ 10∧6 = 1
10,000,000,000/ 10∧10 = 1
1,000,000,000,000/ 10∧12 = 1
Hope this helps! Good luck!
Point J is between H and K on line segment HK. Use the given information to solve for X. Also find the length of line segment HJ.
HK = 33
HJ = 3x-4
JK = 2x+7
X= ?
The length of line segment HJ= ?
Answer:
x=-3, so now u plug it in, 3(-3)-4=?
answer: HJ is -13.
Using line segments concepts, it is found that:
The value of x is 6.The length of line segment HJ is 14.-------------------------------
Point J is between H and K in a line segment HK, thus:[tex]HK = HJ + JK[/tex]
-------------------------------
We are given that:
[tex]HK = 33[/tex][tex]HJ = 3x - 4[/tex][tex]JK = 2x + 7[/tex]Thus, replacing into the equation, it is possible to solve for x.
-------------------------------
[tex]HK = HJ + JK[/tex]
[tex]33 = 3x - 4 + 2x + 7[/tex]
[tex]5x + 3 = 33[/tex]
[tex]5x = 30[/tex]
[tex]x = \frac{30}{5}[/tex]
[tex]x = 6[/tex]
The value of x is 6.
-------------------------------
The length of line segment HJ is:
[tex]HJ = 3x - 4 = 3(6) - 4 = 18 - 4 = 14[/tex]
A similar problem is given at https://brainly.com/question/24476050
A small airplane flew 104 miles in 50 minutes. At this rate, how many miles can it fly in one hour? (50 minutes = 56 hour)
Answer:
124.8 miles
Step-by-step explanation:
104 divided by 5 equals 20.8, then 20.8 times 6 equals 124.8
The number of feet it takes for a car traveling at x miles per hour to stop on dry, level concrete is given by the polynomial 0.06x2+1.1x. Find the stopping distance, in feet, when x=40 miles per hour.
Answer:
The answer is 140
Step-by-step explanation:
We are asked to find the stopping distance, in feet, when x=40 miles per hour. We will substitute this into the polynomial expression 0.06x2+1.1x, and then simplify using the order of operations.
0.06(40)2+1.1(40)=96+44=140
When driving at x=40 miles per hour, the stopping distance is 140ft.
Fill in the value which would complete the square:
X^2 + 10x +____
Answer:
25
Step-by-step explanation:
(x+5)(x+5)=x(x+5)5(x+5)
=x^2+5x+5x+25
=x^2+10x+25
i hope it is clear
Devin brought his snail collection to school. He has 10 snails. How could he put them into 2 tanks so two classes could see them?
Answer: Put 5 in each tank
Step-by-step explanation:
Use base ten blocks or an area model to find the product. 2.1 x 1.5
10 yd
4 yd
What is the area of the shaded portion to the nearest hundredth? Enter the answer in the box.
square yards
What is the answer of the green portion?
Answer : The area of the shaded portion is 33.72 yd².
Step-by-step explanation :
Given:
Length of the box = 10 yd
Width of the box = 4 yd
Area of the shaded portion = Area of rectangular box - Area of half circle
First we have to calculate the area of rectangular box.
Area of rectangular box = Length of the box × Width of the box
Area of rectangular box = 10 yd × 4 yd
Area of rectangular box = 40 yd²
Now we have to calculate the area of half circle.
As we know that:
Area of circle = π × r²
where,
r = radius of circle
Area of half circle = [tex]\frac{\pi \times r^2}{2}[/tex]
Radius of circle = [tex]\frac{4yd}{2}=2yd[/tex]
Area of half circle = [tex]\frac{3.14 \times (2yd)^2}{2}[/tex]
Area of half circle = 6.28 yd²
Now we have to calculate the area of the shaded portion.
Area of the shaded portion = Area of rectangular box - Area of half circle
Area of the shaded portion = 40 yd² - 6.28 yd²
Area of the shaded portion = 33.72 yd²
Therefore, the area of the shaded portion is 33.72 yd².