An educational testing service designed an achievement test so that the range in student scores would be greater than 300 points. To determine whether the objective was achieved, the testing service gave the test to a random sample of 42 students and found that the sample mean and variance were 703 and 2574, respectively. Specify the null and alternative hypotheses for determining whether the test achieved the desired dispersion in scores.
Assume that range $= 6 \sigma$

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The Answer of An educational testing service designed an achievement test so that the range in student scores would be greater than 300 points. To determine whether the objective was achieved, the testing service gave the test to a random sample of 42 students and found that the sample mean and variance were 703 and 2574, respectively. Specify the null and alternative hypotheses for determining whether the test achieved the desired dispersion in scores.
Assume that range $= 6 \sigma$

An Educational Testing Service Designed an Achievement Test So That =6σ= 6 \sigma=6σ

An Educational Testing Service Designed an Achievement Test So That $= 6 \sigma$