1 True or False For ttests values in the sample must be depe

1. True or False: For t-tests, values in the sample must be dependent observations.

___ 2. If two samples are chosen from the same population and both have the same sample size and mean, this does not mean determines the size of the effect, regardless of significance that they will have the same t-statistic. Why not?

a) the variance estimates for each sample will differ

b) this statement is false; the t-statistic would actually be the same

c) the parameters

d) the z-score

____ 3. Cohen’s d measures effect size. Why is it important in hypothesis testing?

a) determines if the treatment effect was greater than chance

b) determines the size of the effect, regardless of significance

c) determines variance

d) determines standard error

_____4. The results of a hypothesis test are reported as follows: t(21) = 2.38, p < ..88. What was the statistical decision and how big was the sample?

a) The null hypothesis was rejected using a sample of n = 21

b) The null hypothesis was not rejected using a sample of n=22

c) The null hypothesis was rejected using a sample of n=22

d) The null hypothesis was not rejected using a sample of n=21

____5. True or False: When the value of t is near 0, the difference between M and is also near 0.

Solution

(1) For t-tests, values in the sample must be dependent observations.

      The statement is FALSE

(2)

If two samples are chosen from the same population and both have the same sample size and mean, this does not mean determines the size of the effect, regardless of significance that they will have the same t-statistic. Why not?

Answer: a) the variance estimates for each sample will differ

(3)

Cohen’s d measures effect size. Why is it important in hypothesis testing?

Answer: b) determines the size of the effect, regardless of significance.

(4)

The results of a hypothesis test are reported as follows: t(21) = 2.38, p < ..88. What was the statistical decision and how big was the sample?

Answer: The null hypothesis was rejected using a sample of n=22. since p-value is small ,we reject H0

               n=degrees of fredom+1

                 =21+1

                 =22

(5) When the value of t is near 0, the difference between M and is also near 0.

       Answer:The statement is TRUE