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# James is a golf player who previously averaged 90 on a certain course. He now owns many golf clubs and in 4 rounds averages 88 with a standard...

Mr.James is a golf player who previously averaged 90 on a certain course. He now owns many golf clubs and in 4 rounds averages 88 with a standard deviation of 2 and 0.01 level of significance. Derive the null and alternative hypothesis with test statistics and critical value. Conclude if his game improved or not.