Question 11Determine the minimum sample size required when you want to be 95% confident that the sample

mean is within one unit of the population mean. Assume a standard deviation of 4.3 in a normally distributed population.

A)73

B)71

C)70

D)72

Question 12

Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.25 units of the population mean. Assume a standard deviation of 2.9 in a normally distributed population.

A)892

B)893

C)365

D)517

Question 13

In a sample of 10 CEOs, they spent an average of 12.9 hours each week looking into new product opportunities with a standard deviation of 4.9 hours. Find the 95% confidence interval.

A)(9.4, 16.4)

B)(11.1, 14.7)

C)(8.0, 17.8)

D)(9.9, 15.9)

Question 14

In a sample of 12 kids, their mean time on the internet on the phone was 3.9 hours with a standard deviation of 0.7 hours. Which distribution would be most appropriate to use?

A)t distribution as the sample size is below 30

B)t distribution as the sample size is below 20

C(t distribution as the standard deviation is below 5

D)z distribution as the standard deviation always represents the population

Question 15

Under a time crunch, you only have time to take a sample of 15 water bottles and measure their contents. The sample had a mean of 20.05 ounces with a standard deviation of 0.3 ounces. What would be the 90% confidence interval?

A)(19.88, 20.22)

B)(19.91, 20.19)

C)(19.75, 20.35)

D)(19.92, 20.18)

 

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