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4.   The 8th-grade national norm for a social science test is a score of 120 with...

4.   The 8th-grade national norm for a social science test is a score of 120 with a
   standard deviation of 10. The research director of a school district wants to
   know how the scores of pupils in his district compare with this standard. He
   selects a sample of 80 students and finds a sample mean of 123 and a
   sample standard deviation of 9.50. Test the null hypothesis at the.05 level of
   significance and state your conclusions. Be sure to follow all steps of the
   hypothesis testing procedure.

Math   Statistics-And-Probability   
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