# testing for difference in means with a z-statistic.

Not what you're looking for?

Identify the test and state the hypothesis, then:

Katy Fit, aerobics instructor at the Anderson Recreation Center, is analyzing the attendance at her classes. She wonders if the mean number of people who come on Monday morning is the same as on Wednesday morning. Some people may be exhausted from their other weekend activities and skip Mondays. Yet others may get busy midweek and be unable to fit exercise into their schedules. Summary data for 35 randomly selected Mondays and 35 randomly selected Wednesdays are reported below. Is there a significant difference in the mean numbers of people who come to class on the two days?

a. Use the P-value method to perform the appropriate test at the 0.04 level of significance.

(Yes, I mean 0.04; it is not a typo.)

b. Find the 95% confidence interval for the difference between the two means.

Sample 1: Monday: Mean = 35 s = 9.5 n = 35

Sample 2: Wednesday: Mean = 28.5, s = 9.8 n = 35

##### Purchase this Solution

##### Solution Summary

The following outlines the process of conducting a hypothesis test to determine if the number of people that show up on two different days is statistically significant.

##### 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.

##### Measures of Central Tendency

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

##### 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.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.