ECON 338/ENVR 305CLICKER QUESTIONSStatistics – 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.

1. 2. 3. 4. 5.

20% 20% 20%20%20%1. H0: μ = 63 vs. Ha: μ > 63

2. H0: μ = 63 vs. Ha: μ ≤ 63

3. H0: μ = 63 vs. Ha: μ < 63

4. H0: μ = 63 vs. Ha: μ ≠ 63

5. 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.

1. 2. 3. 4. 5.

20% 20% 20%20%20%1. 0.33

2. –2.79

3. –0.33

4. 10.80

5. 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. 2. 3. 4. 5.

20% 20% 20%20%20%1. (–∞,–1.282]

2. (–∞,–1.645] U [1.645, ∞

3. [1.282, ∞)

4. (–∞,–1.282] U [1.282, ∞)

5. [1.645, ∞)

Response Counter