Question

We are interested in looking at the percentage of households that own dogs in the U.S....

We are interested in looking at the percentage of households that own dogs in the U.S. and England. We are given the following information:

Number of people Surveyed Number of people who own a dog
U.S. 700 294
England 850 391

The point estimate for the difference in proportions between people in the U.S. who own dogs and people in England who own dogs is:

a.

0.04

b.

0.0716

c.

-0.04

d.

-0.0716

We are interested in looking at the percentage of households that own dogs in the U.S. and England. We are given the following information:

Number of people Surveyed Number of people who own a dog
U.S. 700 294
England 850 391

What is the p-value for this test if we are interested in testing to see if there is simply a difference in the proportions of people who own dogs in the U.S. and England?

a.

0.0571

b.

.10 < p-value < .20

c.

0.9429

d.

0.1142

We are interested in comparing the average price of cars in 2015 and 2010. We are given the following data:

2010 2015
Sample Mean $29,217 $31,252
Sample Standard Deviation $4,560 $3,942
Sample Size 30 22

Find the 95% confidence interval for the difference from 2015 to 2010.

a.

(-341.145, 4411.14)

b.

(-4411.14, 341.145)

c.

(1998.45, 2071.55)

d.

(-2071.55, 1998.45)

We are interested in comparing the average price of cars in 2015 and 2010. We are given the following data:

2010 2015
Sample Mean $29,217 $31,252
Sample Standard Deviation $4,560 $3,942
Sample Size 30 22

The test statistic is:

a.

t= -1.72

b.

z= 1.72

c.

t= 1.72

d.

z= -1.72

We are interested in studying the difference in mile running times for beginners 30 days into training and then 90 days into training to see if they have made significant improvements. The following data is provided:

Runner 30 days 90 days
1 10.2 9.8
2 9.7 8.75
3 8.9 8.0
4 11.6 10.9
5 12.9 12.2

What is the average difference between 30 days and 90 days?

a.

3.65

b.

0.73

c.

-0.73

d.

0.59

We are interested in studying the difference in mile running times for beginners 30 days into training and then 90 days into training to see if they have made significant improvements. The following data is provided:

Runner 30 days 90 days
1 10.2 9.8
2 9.7 8.75
3 8.9 8.0
4 11.6 10.9
5 12.9 12.2

The test statistic is:

a.

t=0.2168

b.

z=7.5292

c.

t= -7.5292

d.

t= 7.5292

Homework Answers

Answer #1

We are given that:

Number of people Surveyed Number of people who own a dog
U.S. 700 294
England 850 391


Proportion of people in the England who own dogs = 391/850 = 0.46 Proportion of people in the US who own dogs = 294/700 = 0.42

The difference in proportions between people in the US who own dogs and people in England who own dogs = 0.42 - 0.46 = -0.04

Option c.-0.04 is correct.

We are given that n1 = 700, p1= 294/700 = 0.42, n2 = 850, p2= 391/850 = 0.46

q = 1 -p= 0.5581

Test statistic is:

Z = (0.42 - 0.46)/0.0253 =- 1.58

you can use excel function ''2*NORMSDIST(-1.58) will get p-value 01142

Correct option is d.0.1142.

Hope this will helpful. Thanks and God Bless You:)

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