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 pvalue 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 < pvalue < .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 
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 n_{1} = 700, p_{1}= 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 pvalue 01142
Correct option is d.0.1142.
Hope this will helpful. Thanks and God Bless You:)
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