Question

1. The primary purpose of hypothesis testing is to attempt to reject the null hypothesis not to accept the alternative hypothesis.

   True

   False

2. In hypothesis testing, a Type 1 error is

   		failing to reject the null hypothesis when it is true.
   		failing to reject the null hypothesis when it is false.
   		rejecting the null hypothesis when it is true.
   		rejecting the null hypothesis when it is false.

3. In general, the power of a statistical test is the probability that a test will

   		reject the alternative hypothesis when the alternative is false.
   		reject the null when the null hypothesis is false.
   		retain the alternative hypothesis when it is true.
   		retain the null hypothesis when it is false

4. The critical value for a one-tailed t-test using an alpha level of .01 with 22 degrees of freedom is

   		2.508
   		2.819
   		2.518
   		2.831

Answer 1

a)  The primary purpose of hypothesis testing is to attempt to reject the null hypothesis not to accept the alternative hypothesis.

TRUE

thats is main purpose is  our sample mean is significantly different from the null hypothesis mean.

b) In general, the power of a statistical test is the probability that a test will test will reject the null when the null hypothesis is false. The larger it is, the better.

c)  The critical value for a one-tailed t-test using an alpha level of .01 with 22 degrees of freedom is   2.818756