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# Question about Hypothesis test regarding a standard deviation

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The standard deviation of the breaking strengths of certain cables produced by a company is given as 240 pounds. After a change was introduced in the process of manufacture of these cables, the breaking strengths of a sample of 8 cables showed a standard deviation of 300 pounds. Investigate the significance of the apparent increase in variability, using a significance level of (a) 0.05 (b) 0.01.

##### Solution Summary

This problem is a test of hypothesis comparing the variance ( and standard deviation) of a new distribution with a known variance from another distribution. A step-by-step process is used, all formulas and calculations are shown and each step is explained.

##### 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.