Question

In a random sample of 520 adults, the mean was 150 and the standard deviation was 4.5. The study was reported with a 95% confidence level, and the confidence interval for the study was 150 ± 0.39. What range of values shows the confidence interval for the study? 146.1 to 153.9 149.61 to 150.39 150 to 150.39 150 to 153.9

Answer 1

Given:
random sample of 520 adults
mean was 150
standard deviation was 4.5.
reported with a 95% confidence level, and the confidence interval for the study was 150 ± 0.39.

The range of values that shows the confidence interval for the study is 149.61 to 150.39

150 + 0.39 = 150.39
150 - 0.39 = 149.61

Answer 2

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

149.61 to 150.39

A confidence level of 95% means:

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