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How to find the test statistics using chi square method?

A professional bowler has been having trouble "hitting the pocket" in order to get strikes. His average has been 205 with a standard deviation of 10 pins. If in his next 15 games his standard deviation is 14 test the belief that his game is more variable than in the past.

Use area = 0.025

describe what is the null and alternate hypothesis?

Find critical value and test statistic Use Chi squared method.

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