Mathematics, 24.04.2020 20:51, constipatedcow18

A standardized test is given to a sixth grade class. Historically the mean score has been 126126 with a variance of 1212. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 2323 students and found a mean of 116116 with a standard deviation of 2.06772.0677. Is there evidence that the standard deviation has decreased at the α=0.05α=0.05 level?

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A standardized test is given to a sixth grade class. Historically the mean score has been 126126 wit...