1. The null hypothesis a. is always stated in terms of sample statistics b. is d

Question

1. The null hypothesis

a. is always stated in terms of sample statistics

b. is denoted by the symbol Hi

c. states that the treatment has no effect

d. None of the above choices are correct.

2. The numerator of the z-score test statistic measures

a. the average distance between M and that would be expected due to error alone.

b. the actual measured distance between M and

c. the position of the sample means relative to the critical region

d. whether or not there is a significant difference between M and

. the average distance between M and that would be expected due to error alone

b. the actual measured distance between M and

c. the position of the sample mean relative to the critical region

d. whether or not there is a significant difference between M and

3. In general, decreasing the alpha level, (for example from .05 to .01), will

a. increase the likelihood of rejecting Ho and increase the risk of a Type I error

b. decrease the likelihood of rejecting Ho and increase the risk of a Type I error

c. increase the likelihood of rejecting Ho and decrease the risk of a Type I error

d. decrease the likelihood of rejecting Ho and decrease the risk of a Type I error

4. A Type II error means that a researcher has concluded that a treatment

a. has an effect when it really does have an effect

b. has no effect when it really does have an effect

c. has no effect when it really has no effect

d. has an effect when it really has no effect

6. The critical region(s) for a hypothesis test consists of outcomes that have

a. a high probability if the null hypothesis is true

b. a high probability whether or not the null hypothesis is true

c. a very low probability if the null hypothesis is true

d. a very low probability only if there is no null hypothesis

7. A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment. The hypothesis test produces a z-score test statistic of z = 2.47. Assuming that the researcher is using a two-tailed test, what decision should be made?

a. The researcher should reject the null hypothesis with a = .05 but not with a = .01.

b. The researcher should reject the null hypothesis with either a= .05 or a= .01.

c. The researcher should fail to reject Ho with either a = .05 or a = .01.

d. cannot answer without additional information

Explanation / Answer

1. The null hypothesis (H0) is a hypothesis which the researcher tries to disprove, reject or nullify. The 'null' often refers to the common view of something. The correct answer is option C.

2. a z-score is the number of standard deviations from the mean a data point is.The correct answer is option B.

3. The correct answer is optipon A.

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