Question 1
From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues?
A)(19.24, 24.14)
B)(20.71, 22.67)
C)(20.93, 22.46)
D)(21.78, 22.60)
Question 2
If a confidence interval is given from 43.8 up to 62.0 and the mean is known to be 52.9, what is the maximum error?
A)9.1
B)43.8
C)18.2
C)4.6
Question 3
If a shirt manufacturer wanted to make shirts that fit most individuals, what characteristics would be better?
A)wide confidence interval so shirts fit few individuals
B)wide confidence interval so shirts fit most individuals
C)narrow confidence interval so shirts fit most individuals
D)narrow confidence interval so shirts fit few individuals
Question 4
Which of the following are most likely to lead to a narrow confidence interval?
A)large sample size
B)large mean
C)small standard deviation
D)large standard deviation
Question 5
If you were designing a study that would benefit from data points with high values, you would want the input variable to have:
A)a large maximum error
B)a large sample size
C)a large standard deviation
D)a large mean