Question 1

Imagine that you have a bag filled with 10 pink marbles and 5 black marbles.What is the probability of pulling a pink marble from the bag?

Accepted Answer

A) .25 
B) .33 
C) .50 
D) .67 
A) .25 
B) .33 
C) .50 
D) .67 D

Question 2

H0 is to Ha as _____ hypothesis is to _____ hypothesis.

Accepted Answer

A) null; alternative 
B) alternative; null 
C) one-tailed; two-tailed 
D) two-tailed; one-tailed 
A) null; alternative 
B) alternative; null 
C) one-tailed; two-tailed 
D) two-tailed; one-tailed A

Question 3

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a black poker chip?

Accepted Answer

20/60 = .33

Question 4

In a recent study,researchers concluded that exercise significantly lowered stress levels.What the researchers were unaware of,however,was that several of the participants in the exercise group were also taking anti-anxiety medications.The researchers' conclusion is a(n)_____ error.

Accepted Answer

A) Type II 
B) Type I 
C) null hypothesis 
D) alternative hypothesis 
A) Type II 
B) Type I 
C) null hypothesis 
D) alternative hypothesis

Question 5

If weight in the general population is normally distributed with an average of 160 pounds and a standard deviation of 20 pounds what is the probability of selecting someone who weighs 120 or less or 170 or more pounds?

Accepted Answer

Z = -2.0 (p = .02275

Question 6

What is the probability of a couple having either a girl or a boy when giving birth?

Accepted Answer

A) .25 
B) .50 
C) .75 
D) 1.0 
A) .25 
B) .50 
C) .75 
D) 1.0

Question 7

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 300 or higher on the test?

Accepted Answer

A)  .98 
B) .02 
C) .12 
D) .75 
A)  .98 
B) .02 
C) .12 
D) .75

Question 8

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a red poker chip followed by a black poker chip?

Accepted Answer

(40/60)× (

Question 9

What is the probability of three tails in three flips of a coin?

Accepted Answer

A) .25 
B) .75 
C) .125 
D) .50 
A) .25 
B) .75 
C) .125 
D) .50

Question 10

What is the probability of a couple having four children in the following order: girl,girl,girl,boy?

Accepted Answer

A) .0625 
B) .125 
C) .25 
D) .50 
A) .0625 
B) .125 
C) .25 
D) .50

Question 11

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or higher on the test?

Accepted Answer

A) .84 
B) .50 
C) .16 
D) .34 
A) .84 
B) .50 
C) .16 
D) .34

Question 12

In a study of the effects of exercise on stress,researchers predict simply that there will be a difference in stress level between the exercise and no exercise groups.The researchers are using a _____ hypothesis.

Accepted Answer

A) two-tailed 
B) directional 
C) one-tailed 
D) one-tailed and directional 
A) two-tailed 
B) directional 
C) one-tailed 
D) one-tailed and directional

Question 13

What is the probability of pulling a heart from a standard (52-card)deck of playing cards?

Accepted Answer

A) .25 
B) .50 
C) .75 
D) 1.0 
A) .25 
B) .50 
C) .75 
D) 1.0

Question 14

When the probability of a Type I error is .05 or less,we say that we have observed _____.

Accepted Answer

A) a Type II error 
B) statistical significance 
C) the alternative hypothesis 
D) all of the above 
A) a Type II error 
B) statistical significance 
C) the alternative hypothesis 
D) all of the above

Question 15

If researchers report that the results from their study were significant,p < .05,this means that

Accepted Answer

A) if they conducted the study over they would get the same results less than 5 times in 100. 
B) the results are untrustworthy. 
C) we would expect the results to occur by chance less than 95 times out of 100. 
D) we would expect the results to occur by chance less than 5 times out of 100. 
A) if they conducted the study over they would get the same results less than 5 times in 100. 
B) the results are untrustworthy. 
C) we would expect the results to occur by chance less than 95 times out of 100. 
D) we would expect the results to occur by chance less than 5 times out of 100.

Question 16

What is the probability of rolling a 3 in a single roll of a die?

Accepted Answer

A) .50 
B) 1.0 
C) .25 
D) .17 
A) .50 
B) 1.0 
C) .25 
D) .17

Question 17

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or lower or 500 or higher on the test?

Accepted Answer

A)  .12 
B) .22 
C) .45 
D) .66 
A)  .12 
B) .22 
C) .45 
D) .66

Question 18

Explain the difference between the null hypothesis and the alternative hypothesis in a study.

Accepted Answer

The null hypothesis predicts that no dif

Question 19

If a researcher decides to use the .01 level of significance rather than using the more conventional .05 level of significance,what type of error is more likely to be made? Why?

Accepted Answer

A Type II error or a miss is m

Question 20

What is the probability of rolling an even number in a single roll of a die?

Accepted Answer

A) .25 
B) .17 
C) .50 
D) .36 
A) .25 
B) .17 
C) .50 
D) .36

Imagine that you have a bag filled with 10 pink marbles and 5 black marbles.What is the probability of pulling a pink marble from the bag?

H₀ is to H_a as _ hypothesis is to _ hypothesis.

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a black poker chip?

In a recent study,researchers concluded that exercise significantly lowered stress levels.What the researchers were unaware of,however,was that several of the participants in the exercise group were also taking anti-anxiety medications.The researchers' conclusion is a(n)_____ error.

If weight in the general population is normally distributed with an average of 160 pounds and a standard deviation of 20 pounds what is the probability of selecting someone who weighs 120 or less or 170 or more pounds?

What is the probability of a couple having either a girl or a boy when giving birth?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 300 or higher on the test?

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a red poker chip followed by a black poker chip?

What is the probability of three tails in three flips of a coin?

What is the probability of a couple having four children in the following order: girl,girl,girl,boy?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or higher on the test?

In a study of the effects of exercise on stress,researchers predict simply that there will be a difference in stress level between the exercise and no exercise groups.The researchers are using a _____ hypothesis.

What is the probability of pulling a heart from a standard (52-card)deck of playing cards?

When the probability of a Type I error is .05 or less,we say that we have observed _____.

If researchers report that the results from their study were significant,p < .05,this means that

What is the probability of rolling a 3 in a single roll of a die?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or lower or 500 or higher on the test?

Explain the difference between the null hypothesis and the alternative hypothesis in a study.

If a researcher decides to use the .01 level of significance rather than using the more conventional .05 level of significance,what type of error is more likely to be made? Why?

What is the probability of rolling an even number in a single roll of a die?

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Introduction to Inferential Statistics

The Logic of Experimental Design

Inferential Statistics: Two-Group Designs

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

Exam 7: Probability and Hypothesis Testing

Imagine that you have a bag filled with 10 pink marbles and 5 black marbles.What is the probability of pulling a pink marble from the bag?

H0 is to Ha as _____ hypothesis is to _____ hypothesis.

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a black poker chip?

In a recent study,researchers concluded that exercise significantly lowered stress levels.What the researchers were unaware of,however,was that several of the participants in the exercise group were also taking anti-anxiety medications.The researchers' conclusion is a(n)_____ error.

If weight in the general population is normally distributed with an average of 160 pounds and a standard deviation of 20 pounds what is the probability of selecting someone who weighs 120 or less or 170 or more pounds?

What is the probability of a couple having either a girl or a boy when giving birth?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 300 or higher on the test?

Imagine that I have a jar that contains 20 black poker chips and 40 red poker chips.What is the probability of selecting a red poker chip followed by a black poker chip?

What is the probability of three tails in three flips of a coin?

What is the probability of a couple having four children in the following order: girl,girl,girl,boy?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or higher on the test?

In a study of the effects of exercise on stress,researchers predict simply that there will be a difference in stress level between the exercise and no exercise groups.The researchers are using a _____ hypothesis.

What is the probability of pulling a heart from a standard (52-card)deck of playing cards?

When the probability of a Type I error is .05 or less,we say that we have observed _____.

If researchers report that the results from their study were significant,p < .05,this means that

What is the probability of rolling a 3 in a single roll of a die?

Given that on one section of the SAT the mean is 500 and the standard deviation is 100,what is the approximate probability of a student scoring 400 or lower or 500 or higher on the test?

Explain the difference between the null hypothesis and the alternative hypothesis in a study.

If a researcher decides to use the .01 level of significance rather than using the more conventional .05 level of significance,what type of error is more likely to be made? Why?

What is the probability of rolling an even number in a single roll of a die?

Thinking Like a Scientist

Getting Started: Ideas, resources, and Ethics

Defining, measuring, and Manipulating Variables

Descriptive Methods

Data Organization and Descriptive Statistics

Correlational Methods and Statistics

Introduction to Inferential Statistics

The Logic of Experimental Design

Inferential Statistics: Two-Group Designs

Experimental Designs With More Than Two Levels of an Independent Variable

Complex Experimental Design

Quasi-Experimental and Single-Case Designs

Apa Communication Guidelines

Filters

H₀ is to H_a as _ hypothesis is to _ hypothesis.