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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

What is the null and alternate hypothesis?

Find critical value and test statistic Use Chi squared method.

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