Question 1

When the alpha level is .05,a result is defined as non-chance if the probability of obtaining that result,assuming the null hypothesis is true,is greater than .05.

Accepted Answer

A) True 
 B)False

Question 2

A biopsychologist is interested in how quickly rats learn a complicated maze.He puts 5 rats,labeled A,B,C,D,and E,in a box.He wants to run two of the rats through a maze,one rat at a time.How many subsets of 2 rats could he choose to run through the maze if order does matter?

Accepted Answer

A) 6 
B) 10 
C) 20 
D) 120 
A) 6 
B) 10 
C) 20 
D) 120

Question 3

If our observations are so discrepant from the expected result that the difference cannot be attributed to chance,we will reject the null hypothesis in favor of the alternative hypothesis.

Accepted Answer

A) True 
 B)False

Question 4

According to classical probability theory,the act of selecting a card at random from a deck is called a(n)

Accepted Answer

A) trial 
B) event 
C) conditional probability 
D) joint probability 
A) trial 
B) event 
C) conditional probability 
D) joint probability

Question 5

In counting rules,permutations take into account the order of objects,while combinations do not.

Accepted Answer

A) True 
 B)False

Question 6

In factorial notation,the expression 0! equals 1.

Accepted Answer

A) True 
 B)False

Question 7

A joint probability is the likelihood of a causal relationship between two events.

Accepted Answer

A) True 
 B)False

Question 8

Sampling with replacement involves the random selection of a given case and the replacement of that case with a different case from the same population.

Accepted Answer

A) True 
 B)False

Question 9

A new drug developed to fight depression has a .20 probability of causing dizziness.A person takes the drug 100 times.
What is the mean and standard deviation of the binomial distribution of this data?

Accepted Answer

A) mean = 20,standard deviation = 4 
B) mean = 20,standard deviation = 16 
C) mean = 80,standard deviation = 4 
D) mean = 80,standard deviation = 16 
A) mean = 20,standard deviation = 4 
B) mean = 20,standard deviation = 16 
C) mean = 80,standard deviation = 4 
D) mean = 80,standard deviation = 16

Question 10

The probability of an event,A,is formally defined as the number of observations favoring event A divided by the:

Accepted Answer

A) total number of possible observations 
B) total number of possible events 
C) proportion of observations 
D) proportion of events 
A) total number of possible observations 
B) total number of possible events 
C) proportion of observations 
D) proportion of events

Question 11

The statement "Given that a person is satisfied with his job,what is the probability that he is satisfied with his marriage?" is an example of a(n):

Accepted Answer

A) hypothesis 
B) conditional probability 
C) independent event 
D) a and c 
A) hypothesis 
B) conditional probability 
C) independent event 
D) a and c

Question 12

A researcher wanted to compare eye color distributions of babies born with a birth defect with babies who did not have the birth defect.26 babies with the defect were matched on gender,race,and age with 52 babies without the defect.The frequency of different eye colors as a function of the presence or absence of the defects was as follows:
Eye Color
Group Dark Medium Light
Defect 1 6 19
No Defect 15 13 24
If a baby was randomly selected from those participating in the study,the likelihood of that baby having dark eyes is ____.

Accepted Answer

A) 1/16 
B) 35/78 
C) 16/78 
D) 1/26 + 15/52 
A) 1/16 
B) 35/78 
C) 16/78 
D) 1/26 + 15/52

Question 13

Suppose you are asked to toss 10 dimes and observe the number of heads.What is the likelihood of observing exactly 0 heads?

Accepted Answer

A) .001 
B) .50 
C) 0 
D) 1.0 
A) .001 
B) .50 
C) 0 
D) 1.0

Question 14

If the probability of event A is .40 and the probability of event B is .35,what is the probability that event A or B will occur,if A and B are independent?

Accepted Answer

A) .14 
B) .61 
C) .75 
D) cannot be determined 
A) .14 
B) .61 
C) .75 
D) cannot be determined

Question 15

In general,the probability of observing at least one of event A and event B is p(A or B)= p(A)+ p(B)- p(A,B).

Accepted Answer

A) True 
 B)False

Question 16

In hypothesis testing,if observations are very similar to what would be expected from chance alone,we ____________________the null hypothesis.

Accepted Answer

The answer of In hypothesis testing,if observations are very similar...

Question 17

What is an alpha level and how does it relate to hypothesis testing?

Accepted Answer

Within the context of hypothesis testing

Question 18

If the observations are so different from the expected result of a study that the difference cannot be due to chance,then you should reject the _____.

Accepted Answer

A) alpha level 
B) conditional probability 
C) alternative hypothesis 
D) null hypothesis 
A) alpha level 
B) conditional probability 
C) alternative hypothesis 
D) null hypothesis

Question 19

A sample of 500 people aged 30 - 40 years old were interviewed to study the relationship between whether a person graduated from college or only high school and whether s/he changed jobs in the last 5 years.The results are found in the contingency table below.  
Answers below have been rounded to two decimal places.
Which of the following is a marginal frequency in the above table?

Accepted Answer

A) 63 
B) 128 
C) 245 
D) 500 
A) 63 
B) 128 
C) 245 
D) 500

Question 20

In a population consisting of 60 males and 40 females,the probability of randomly selecting a male is:

Accepted Answer

A) 6% 
B) .06 
C) .60 
D) undefined 
A) 6% 
B) .06 
C) .60 
D) undefined

When the alpha level is .05,a result is defined as non-chance if the probability of obtaining that result,assuming the null hypothesis is true,is greater than .05.

A biopsychologist is interested in how quickly rats learn a complicated maze.He puts 5 rats,labeled A,B,C,D,and E,in a box.He wants to run two of the rats through a maze,one rat at a time.How many subsets of 2 rats could he choose to run through the maze if order does matter?

If our observations are so discrepant from the expected result that the difference cannot be attributed to chance,we will reject the null hypothesis in favor of the alternative hypothesis.

According to classical probability theory,the act of selecting a card at random from a deck is called a(n)

In counting rules,permutations take into account the order of objects,while combinations do not.

In factorial notation,the expression 0! equals 1.

A joint probability is the likelihood of a causal relationship between two events.

Sampling with replacement involves the random selection of a given case and the replacement of that case with a different case from the same population.

A new drug developed to fight depression has a .20 probability of causing dizziness.A person takes the drug 100 times. What is the mean and standard deviation of the binomial distribution of this data?

The probability of an event,A,is formally defined as the number of observations favoring event A divided by the:

The statement "Given that a person is satisfied with his job,what is the probability that he is satisfied with his marriage?" is an example of a(n):

Suppose you are asked to toss 10 dimes and observe the number of heads.What is the likelihood of observing exactly 0 heads?

If the probability of event A is .40 and the probability of event B is .35,what is the probability that event A or B will occur,if A and B are independent?

In general,the probability of observing at least one of event A and event B is p(A or B)= p(A)+ p(B)- p(A,B).

In hypothesis testing,if observations are very similar to what would be expected from chance alone,we ____________________the null hypothesis.

What is an alpha level and how does it relate to hypothesis testing?

If the observations are so different from the expected result of a study that the difference cannot be due to chance,then you should reject the _____.

In a population consisting of 60 males and 40 females,the probability of randomly selecting a male is:

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Measures of Central Tendency and Variability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters

Exam 6: Probability

When the alpha level is .05,a result is defined as non-chance if the probability of obtaining that result,assuming the null hypothesis is true,is greater than .05.

A biopsychologist is interested in how quickly rats learn a complicated maze.He puts 5 rats,labeled A,B,C,D,and E,in a box.He wants to run two of the rats through a maze,one rat at a time.How many subsets of 2 rats could he choose to run through the maze if order does matter?

If our observations are so discrepant from the expected result that the difference cannot be attributed to chance,we will reject the null hypothesis in favor of the alternative hypothesis.

According to classical probability theory,the act of selecting a card at random from a deck is called a(n)

In counting rules,permutations take into account the order of objects,while combinations do not.

In factorial notation,the expression 0! equals 1.

A joint probability is the likelihood of a causal relationship between two events.

Sampling with replacement involves the random selection of a given case and the replacement of that case with a different case from the same population.

A new drug developed to fight depression has a .20 probability of causing dizziness.A person takes the drug 100 times. What is the mean and standard deviation of the binomial distribution of this data?

The probability of an event,A,is formally defined as the number of observations favoring event A divided by the:

The statement "Given that a person is satisfied with his job,what is the probability that he is satisfied with his marriage?" is an example of a(n):

Suppose you are asked to toss 10 dimes and observe the number of heads.What is the likelihood of observing exactly 0 heads?

If the probability of event A is .40 and the probability of event B is .35,what is the probability that event A or B will occur,if A and B are independent?

In general,the probability of observing at least one of event A and event B is p(A or B)= p(A)+ p(B)- p(A,B).

In hypothesis testing,if observations are very similar to what would be expected from chance alone,we ____________________the null hypothesis.

What is an alpha level and how does it relate to hypothesis testing?

If the observations are so different from the expected result of a study that the difference cannot be due to chance,then you should reject the _____.

In a population consisting of 60 males and 40 females,the probability of randomly selecting a male is:

Introduction and Mathematical Preliminaries

Frequency and Probability Distributions

Percentiles percentile Ranks standard Scores and the Normal Distribution

Pearson Correlation and Regression: Descriptive Aspects

Measures of Central Tendency and Variability

Estimation and Sampling Distributions

Hypothesis Testing: Inferences About a Single Mean

Principles of Research Design and Statistical Preliminaries for Analyzing Bivariate Relationships

Independent Groups T -Test

Correlated Groups T-Test

One-Way Repeated Measures Analysis of Variance

Pearson Correlation and Regression: Inferential Aspects

Chi-Square Test

Nonparametric Statistics

Two-Way Between-Subjects Analysis of Variance

Overview and Extension: Statistical Tests for More Complex Designs

Filters