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October 20, 2014

October 20, 2014

Posted by **Clay** on Tuesday, November 27, 2012 at 1:45am.

1. Based on these data, a 95% confidence interval for the true mean height of all

14-year-old girls is:

A) 62 +/- 1.96

B) 62 +/- 1.386

C) 62 +/- 1.645

D) 62 +/- 0.196

2. Which of the following correctly interprets the 95% confidence interval for the true

mean height of all 14-year-old girls?

A) We can be 95% confident that the sample mean height of 14-year-old girls is within

the confidence interval obtained.

B) If this study were to be repeated with a sample of the same size, there is a 0.95

probability that the sample mean height of 14-year-old girls would be in the interval

obtained.

C) We can be 95% confident that the population mean height of all 14-year-old girls is

within the interval obtained.

D) 95% of all 14-year-old girls have heights within the interval obtained.

- Statistics -
**PsyDAG**, Tuesday, November 27, 2012 at 12:52pm1. 95% = mean ± 1.96SEm

SEm = SD/√n

2. C

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