The t test for the mean difference between two related populations assumes that the respective:?

1. The t test for the mean difference between two related populations assumes that the respective:


a.sample sizes are equal.


b.sample variances are equal.


c.populations are approximately normal or sample sizes are large enough.


d.All of the above.





2. Suppose we wish to test H0: µ = 47 versus H1: %26gt; 47. What will result if we conclude that the mean is greater than 47 when its true value is really 52?


a. We have made a Type I error.


b. We have made a Type II error.


c. We have made a correct decision.


d. None of the above are correct





3. Which of the following would be an appropriate null hypothesis?


a. The mean of a population is equal to 55.


b. The mean of a sample is equal to 55.


c. The mean of a population is greater than 55.


d. Only a and c are true.

The t test for the mean difference between two related populations assumes that the respective:?
1c. Because if the sample sizes are large the distribution of means approach a normal distribution. The sample sizes need not be equal. There are ways to pool the standard deviations if the variances are not equal.


2c. No error. You've proved what you were trying to prove.


3 a. The null hypothesis is always about a population parameter and one of equality.
Reply:1c