statistics
posted by Rob .
Part 1)
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 eightweek 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.

Find 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.
Respond to this Question
Similar Questions

Statistics
Suppose a researcher wants to study the effectiveness of a new reading program for students who have not acquired the necessary reading skills by the time they reach the 8th grade. A randomly selected group of 50 students from a local … 
MATH
Suppose a researcher wants to study the effectiveness of a new reading program for students who have not acquired the necessary reading skills by the time they reach the 8th grade. A randomly selected group of 50 students from a local … 
Statistics
The psychologists are interested in whether depressed people undergoing group therapy will perform a different number of activities of daily living before and after group therapy. Therefore, the psychologists have randomly selected … 
Science
Name the type of research for each of the following and rank them 15 (1 strongest, 5 weakest: 5 points). A. A researcher collects questionnaires from people who exercise and nonexercising people to determine whether there was a difference … 
Computer
After writing the program of Exercise 17.7, write a simple program to create some test data for checking out the program. Use the following sample account data: Master file Account number Name Balance 100 Alan Jones 348.17 300 Mary … 
Sport Psychology
Which of the following types of exercise reliability reduce depression? 
Health (Ms. Sue)
1. Summarize the steps to designing a fitness program. A: The steps to designing a fitness program. First, you must determine your resting heart rate. Once you have determined your resting heart rate, you need to calculate your target … 
Statistics
A packing company investigates a national training consultant in hopes of improving productivity on the packing line. The national consultant agrees to work with 18 employees, collecting productivity data for each employee before the … 
statistics
DO I NEED TO USE 2TAILED OR 2TAILED RESULTS? 
Physical education URGENT PLEASE HELPPPP
Explain how sprinters use flexibility. Explain how javelin throwers use flexibility. Explain how gymnasts in floor routines use flexibility.