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# Comparing Samples

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The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25lb and that the standard deviation was 5.84 lb. Ten packages randomly selected at the end of the month had a mean weight of 24.80 lb and a standard deviation of 5.67 lb. at the .05 significance level, can we conclude that the packages shipped at the end of the month weigh more?

##### Solution Summary

The solution compares samples using statistical methods. The significance level can be found.

##### 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.

##### 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.