QUESTION 21
Joe would like to estimate the average temperature for a certain month (30 days). He randomly selects 15 days and records the following data:
52 55 59 60 62 62 64 65 70 73 74 74 74 78 85
Which of the numbers below represent his point estimate?
A. 
67.1 

B. 
33.6 

C. 
65.0 

D. 
74.0 
QUESTION 22
Suppose your sample mean is $238 and your sample standard deviation is $24. If your sample size is 30, find the margin of error using 95% confidence.
A. 
$8.59 

B. 
$4.38 

C. 
$85.90 

D. 
$15.68 
QUESTION 23
Suppose you do a project on the average number of states students have visted. You get data from 35 students and find a sample mean of 8.4 states with a sample standard deviation of 5.9 states. Find the margin of error using 90% confidence.
A. 
1.6 states 

B. 
1.0 states 

C. 
3,2 states 

D. 
2,3 states 
QUESTION 24
A realtor wants to estimate the average number of days a house is on the market in her town. Based on data from the last 40 transactions in her town, she finds a sample mean of 79 days with a standard deviation of 38 days. What is the margin of error for her data, using 99% confidence?
15.5 days 

16.7 days 

32.2 days 

6.0 days 
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