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Five step method:Testing of mean

Using and Interpreting Concepts
Testing Claims Using P-values In Exercises 33-38,
(a) write the claim mathematically and identify and .
(b) find the standardized test statistic and its corresponding area.
(c) find the value.
(d) decide whether to reject or fail to reject the null hypothesis.
(e) interpret the decision in the context of the original claim.
33. Mathematics Assessment Tests In Illinois, a random sample of 85 eighth grade
students has a mean score of 265 with a standard deviation of 55 on a
national mathematics assessment test. This test result prompts a state
school administrator to declare that the mean score for the state's eighth
graders on the examination is more than 260. At is there enough
evidence to support the administrator's claim? (Adapted from National Center
for Education Statistics)

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Solution Summary

The solution provides step by step method for the calculation of z test statistic for population mean. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data. The data is adapted from National Center for Education Statistics.