wo accounting professors decided to compare the variance of their grading procedures. To accomplish this, they each graded the same 10 exams, with the following results: Mean Grade Standard Deviation Professor 1 79.3 22.4 Professor 2 82.1 12.0 What is the alternate hypothesis?
44. Two accounting professors decided to compare the variance of their grading procedures. To accomplish this, they each graded the same 10 exams, with the following results:
| Standard Deviation | ||
| Professor 1 | 79.3 | 22.4 |
| Professor 2 | 82.1 | 12.0 |
What is the alternate hypothesis?
56. The annual dividend rates for a random sample of 16 companies in three different industries, utilities, banking, and insurance, were recorded. The ANOVA comparing the mean annual dividend rate among three industries rejected the null hypothesis that the dividend rates were equal. The mean square error (MSE) was 4.12. The following table summarized the results:
| Utilities | Banking | Insurance | |
| Number Sampled | 5 | 5 | 6 |
| Mean Annual Dividend Rate | 12.66 | 18.00 | 18.7 |
When comparing the mean annual dividend rate for companies in the insurance and utilities industries, which of the following 95% confidence intervals can be constructed?
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6.04 ± 2.120 × 2.66
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6.04 ± 2.160 × 1.23
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6.04 ± 2.160 × 2.66
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6.04 ± 2.120 × 1.23
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