Q6. If the null hypothesis is H0: ρ ≤ 0, what is the appropriate alternative hypothesis? A) Ha: ρ ≠ 0. B) Ha: ρ > 0. C) Ha: ρ < 0.
Q7. In order to test if the mean IQ of employees in an organization is greater than 100, a sample of 30 employees is taken and the sample value of the computed test statistic, tn-1 = 1.2. If you choose a 5% significance level you should: A) fail to reject the null hypothesis and conclude that the population mean is not greater than 100. B) reject the null hypothesis and conclude that the population mean is greater than 100. C) fail to reject the null hypothesis and conclude that the population mean is greater than 100.
Q8. In order to test whether the mean IQ of employees in an organization is greater than 100, a sample of 30 employees is taken and the sample value of the computed test statistic, tn-1 = 3.4. The null and alternative hypotheses are:
A)H0: µ ≤ 100; Ha: µ > 100. B)H0: µ = 100; Ha: µ ≠ 100. C)H0: X ≤ 100; Ha: X > 100.
Q9. In a two-tailed test of a hypothesis concerning whether a population mean is zero, Jack Olson computes a t-statistic of 2.7 based on a sample of 20 observations where the distribution is normal. If a 5% significance level is chosen, Olson should: A) reject the null hypothesis and conclude that the population mean is not significantly different from zero. B) fail to reject the null hypothesis that the population mean is not significantly different from zero. C) reject the null hypothesis and conclude that the population mean is significantly different from zero.
Q10. What kind of test is being used for the following hypothesis and what would a z-statistic of 1.68 tell us about a hypothesis with the appropriate test and a level of significance of 5%, respectively? H0: B ≤ 0 HA: B > 0 A) One-tailed test; fail to reject the null. B) Two-tailed test; fail to reject the null. C) One-tailed test; reject the null.
| 
发表于 2009-1-13 15:52
| 
