Thursday

April 24, 2014

April 24, 2014

Posted by **Rob** on Monday, March 7, 2011 at 8:01am.

A physical therapists wishes to determine whether an exercise program increases flexibility. He measures the flexibility (in inches) of 12 randomly selected subjects both before and after an intensive eight-week training program and obtains the following data:

Before: 18.5, 21.5, 16.5, 21, 20, 15, 19.75, 15.75, 18, 22, 15, 20.5

After: 19.25, 21.75, 16.5, 20.5, 22.25, 16, 19.5, 17, 19.25, 19.5, 16.5, 20

Test the claim that the flexibility before the exercise program is less than the flexibility after the exercise program at a significance level of 0.01. Note: the data is approximately normal with no outliers.

Part 2)

Using the data from the previous problem, construct a 95% confidence interval about the population mean difference. Interpret your result.

Any help would be greatly appreciated. Thank you for your time.

- statistics -
**PsyDAG**, Monday, March 7, 2011 at 10:39amFind the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Use this data with the information in my response to your previous post.

**Related Questions**

Science - Name the type of research for each of the following and rank them 1-5...

Sport Psychology - Which of the following types of exercise reliability reduce ...

Statistics - The psychologists are interested in whether depressed people ...

Statistics - Suppose a researcher wants to study the effectiveness of a new ...

Health (Ms. Sue) - 1. Summarize the steps to designing a fitness program. A: The...

MATH - Suppose a researcher wants to study the effectiveness of a new reading ...

Statistics - Suppose a researcher wants to study the effectiveness of a new ...

statistics - A small company has 15 employees. Five of these employees will be ...

8th grade - Suppose a researcher wants to study the effectiveness of a new ...

Statistics - male heights are normaly distributed with a mean of 70 and a ...