A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The

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A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The

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A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 22 students and found a mean of 151 with a standard deviation of 0.4811. Is there evidence that the standard deviation has decreased at the a = 0.025 level? Step 1 of 5: State the hypotheses in terms of the standard deviation, Round the standard deviation to four decimal places when necessary.

A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 22 students and found a mean of 151 with a standard deviation of 0.4811. Is there evidence that the standard deviation has decreased at the a = 0.025 level? Step 2 of 5: Determine the critical value(s) of the test statistic. If the test is two-talled, separate the values with a comma. Round your answer to three decimal places

A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 22 students and found a mean of 151 with a standard deviation of 0.4811. Is there evidence that the standard deviation has decreased at the a = 0.025 level? Step 3 of 5: Determine the value of the test statistic Round your answer to three decimal places

A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 22 students and found a mean of 151 with a standard deviation of 0.4811, is there evidence that the standard deviation has decreased at the a 0.025 level? Step 4 of 5: Make the decision

A standardized test is given to a sixth grade class. Historically the mean score has been 141 with a variance of 20. The superintendent believes that the variance of performance may have recently decreased. She randomly sampled 22 students and found a mean of 151 with a standard deviation of 0,4811. Is there evidence that the standard deviation has decreased at the a = 0,025 level? Step 5 of 5: What is the conclusion?
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