Purchase Solution

Hypothesis test : Z test

Not what you're looking for?

Ask Custom Question

A researcher was interested in determining whether corporate executives who exercised regularly scored lower than corporate executives in general on a scale of stress symptoms. For corporate executives in general, the average on this test is 80 with a standard deviation of 12. The researcher then measured 20 executives who exercised and found them to have a mean score of 72.

?Is this difference significant at the .05 level?

?What is the comparison distribution and what are its characteristics (include the sample size, mean, variance, and standard deviation)?

?What will be the cutoff Z-score necessary to reject the null hypothesis at p< .05? What is the Z-score of the sample?

?State your decision in terms of accepting or rejecting the null hypothesis. Justify your decision.

Purchase this Solution

Solution Summary

The solution provides step by step method for the calculation of hypothesis testing using Z test . Formula for the calculation and Interpretations of the results are also included.

Solution Preview

Please see the attachments

Answer
H0: The mean stress score of corporate executives who exercised regularly is not signficnatly different from 80.
H1: The mean stress score of corporate executives who exercised regularly is significantly lower than 80.
The test statistic used is Z test ...

Purchase this Solution


Free BrainMass Quizzes
Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.