Econ 338/envr 305 clicker questions

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There are two statistical tests for mean: 1) z test – Used for large samples (n ≥ 30) 1) t test – Used for small samples (n < 30)
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Econ 338/envr 305 clicker questions Statistics – Question Set #5 (from Chapter8)

The average scores in a pre-final examination scored by under graduate students in the previous year was 63. A tutor, after conducting the weekly tests, wishes to check whether that average has increased this year. For a sample of 70 students, the mean score was 68 with a standard deviation of 15. State the null and the alternative hypotheses. H0: μ = 63 vs. Ha: μ > 63 H0: μ = 63 vs. Ha: μ ≤ 63 H0: μ = 63 vs. Ha: μ < 63 H0: μ = 63 vs. Ha: μ ≠ 63 H0: μ = 63 vs. Ha: μ ≥ 63 Response Counter

The average scores in a pre-final examination scored by under graduate students in the previous year was 63. A tutor, after conducting the weekly tests, wishes to check whether that average has increased this year. For a sample of 70 students, the mean score was 68 with a standard deviation of 15. Compute the value of the test statistic. 0.33 –2.79 –0.33 10.80 2.79 Response Counter

The average scores in a pre-final examination scored by under graduate students in the previous year was 63. A tutor, after conducting the weekly tests, wishes to check whether that average has increased this year. For a sample of 70 students, the mean score was 68 with a standard deviation of 15. Find the rejection region for the standardized test statistic at the 10% significance level. (–∞,–1.282] (–∞,–1.645] U [1.645, ∞ [1.282, ∞) (–∞,–1.282] U [1.282, ∞) [1.645, ∞) Response Counter

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