Statistical Inferences

Question 1

A confidence level of 95% means:

Revolt · Accepted Answer

95% of the time, population data will fall between 149.61 and 150.39.

Question 2

What range of values shows the confidence interval for the study?

Revolt · Accepted Answer

149.61 to 150.39

Question 3

Among 420 randomly selected employees at a company, the mean number of hours of overtime worked per month is 10 hours and the standard deviation is 1.6. What is the margin of error, assuming a 99% confidence level?

Revolt · Accepted Answer

0.20

Question 4

What is the margin of error, assuming a 90% confidence level? Round your answer to the nearest tenth.

Revolt · Accepted Answer

2.6

Question 5

The margin of error for a 95% confidence level will be greater than 0.3.less than 0.3.equal to 0.3.

Revolt · Accepted Answer

greater than 0.3.

Question 6

The margin of error, assuming a 95% confidence level, is approximately . Round to the nearest hundredth

Revolt · Accepted Answer

0.04

Question 7

Question 8

Revolt · Accepted Answer

7.33; 7.67

Question 8

The confidence interval is ⇒ 7.33 to ⇒ 7.67.

Revolt · Accepted Answer

⇒ 7.33: 0.27 to 0.39; ⇒ 7.67: 0.27 to 0.39

Question 9

You are told that in a sample of size 225 the mean is 48.5 and the standard deviation is 1.8. The study is reported with 90% confidence level. Explain how to determine if 48.8 is within the confidence interval.

Revolt · Accepted Answer

To find the margin of error, multiply the z-score by the standard deviation, then divide by the square root of the sample size. The z*-score for a 90% confidence level is 1.645. The margin of error is 0.20. The confidence interval is 48.3 to 48.7. 48.8 is not within the confidence interval.

Question 10

The confidence interval is [___] to [___].

Revolt · Accepted Answer

0.27 to 0.39

Statistical Inferences Answers

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