Question 1

lf alpha is changed from 0.05 to 0.01, _________.

Accepted Answer

A)  the probability of a Type II error decreases 
B)  the probability of a Type I error increases 
C)  the error probabilities stay the same the probability we will retain a false H 0 increases 
D)  the probability we will retain a false H 0 increases

Question 2

If the alpha level is changed from 0.05 to 0.01, what effect does this have on beta?

Accepted Answer

A)  beta decreases 
B)  beta increases 
C)  beta is unaffected 
D)  cannot be determined

Question 3

Define nondirectional hypothesis.

Accepted Answer

The answer of Define nondirectional hypothesis....

Question 4

Using the sign test, with N = 15 and a = 0.05 2-tail , if H 0 is true, the probability of making a type I error equals _________.

Accepted Answer

A)  0.0042 
B)  0 
C)  0.05 
D)  0.0352 
E)  none of these

Question 5

We always evaluate just the specific result obtained in the experiment.

Accepted Answer

A) True 
 B)False

Question 6

If the probability of the results obtained equals 0.05 and a = 0.05, you should reject H0 .

Accepted Answer

A) True 
 B)False

Question 7

If a = 0.01 and H1 is 2-tailed then there is 0.005 under each tail.

Accepted Answer

A) True 
 B)False

Question 8

If we set alpha at 0.05 instead of 0.01, other factors held constant _________.

Accepted Answer

A)  greater risk of a Type I error and a lower risk of a Type II error 
B)  greater risk of a Type I error and a greater risk of a Type II error 
C)  a lower risk of a Type I error and a greater risk of a Type II error 
D)  a lower risk of a Type I error and a lower risk of a Type II error

Question 9

If a result is statistically significant, it must be an important result.

Accepted Answer

A) True 
 B)False

Question 10

When the results are statistically significant, this means _________.

Accepted Answer

A)  the obtained probability is equal to or less than alpha 
B)  the independent variable has had a large effect 
C)  we can reject H 0 
D)  the obtained probability is equal to or less than alpha and we can reject H 0

Question 11

In the real world the scientist can never be certain whether or not H0 is true.

Accepted Answer

A) True 
 B)False

Question 12

lf we drew a random sample from an introductory psychology class, to whom could we generalize our results?

Accepted Answer

A)  all of human kind 
B)  the university 
C)  all psychology students 
D)  the students in that introductory psychology class

Question 13

A psychologist is interested in whether hypnosis affects brain dominance. Twelve college students from the freshmen class are randomly sampled for an experiment. The experiment has two conditions which are given on different days. In condition 1, the students are hypnotized and then given a test which measures the relative dominance of the right and left hemispheres. The higher the score, the more dominant is the right hemisphere. In condition 2, the same students are given the test again, only this time they are not hypnotized but are in their normal state of consciousness. The following scores are obtained.

Accepted Answer

The answer of A psychologist is interested in whether hypnosis...

Question 14

It is technically correct to conclude by "accepting" rather than "failing to reject" H 0 .

Accepted Answer

A) True 
 B)False

Question 15

Why do we directly test the null hypothesis instead of the alternative hypothesis?

Accepted Answer

The answer of Why do we directly test the null...

Question 16

Using the sign test, if (1) H 1 is directional, (2) H 0 is false, (3) a = 0.01, and (4) N = 12, then the probability of making a Type I error equals _________.

Accepted Answer

A)  0.0002 
B)  0.0010 
C)  0 
D)  0.0192

Question 17

Briefly describe the process involved in hypothesis testing, beginning with H 1 and H 0 , and ending with generalization to the population

Accepted Answer

The answer of Briefly describe the process involved in hypothesis...

Question 18

It is not possible to analyze the probability of the alternative hypothesis because the laws of probability are derived for chance events. This is why we test H0 instead of H1 .

Accepted Answer

A) True 
 B)False

Question 19

We always directly evaluate H 1 when analyzing the data.

Accepted Answer

A) True 
 B)False

Question 20

To answer this question, refer to the following hypothetical data collected using replicated measures design:  What is your conclusion regarding H0 using a = 0.052 tailed.

Accepted Answer

A)  reject H0 
B)  accept H0 
C)  retain H0 
D)  retain H1 
E)  accept or retain H0

Exam 10: Introduction to Hypothesis Testing: Using the Sign Test

lf alpha is changed from 0.05 to 0.01, _________.

If the alpha level is changed from 0.05 to 0.01, what effect does this have on beta?

Define nondirectional hypothesis.

Using the sign test, with N = 15 and a = 0.05 2-tail , if H 0 is true, the probability of making a type I error equals _________.

We always evaluate just the specific result obtained in the experiment.

If the probability of the results obtained equals 0.05 and a = 0.05, you should reject H₀ .

If a = 0.01 and H₁ is 2-tailed then there is 0.005 under each tail.

If we set alpha at 0.05 instead of 0.01, other factors held constant _________.

If a result is statistically significant, it must be an important result.

When the results are statistically significant, this means _________.

In the real world the scientist can never be certain whether or not H₀ is true.

lf we drew a random sample from an introductory psychology class, to whom could we generalize our results?

It is technically correct to conclude by "accepting" rather than "failing to reject" H 0 .

Why do we directly test the null hypothesis instead of the alternative hypothesis?

Using the sign test, if (1) H 1 is directional, (2) H 0 is false, (3) a = 0.01, and (4) N = 12, then the probability of making a Type I error equals _________.

Briefly describe the process involved in hypothesis testing, beginning with H 1 and H 0 , and ending with generalization to the population

It is not possible to analyze the probability of the alternative hypothesis because the laws of probability are derived for chance events. This is why we test H₀ instead of H₁ .

We always directly evaluate H 1 when analyzing the data.

To answer this question, refer to the following hypothetical data collected using replicated measures design: What is your conclusion regarding H₀ using a = 0.05_{2 tailed}.