Question 1

A probability distribution gives us

Accepted Answer

A) a distribution of probabilities. 
B) the probability of every possible event in a population. 
C) the probability of some of the events in the population. 
D) the probability of obtaining certain probabilities. 
A) a distribution of probabilities. 
B) the probability of every possible event in a population. 
C) the probability of some of the events in the population. 
D) the probability of obtaining certain probabilities.

Question 2

Asaad wants to show Cheryl and Cindy a card trick he has learned.He first asks Cheryl to draw one card at random from a standard deck of 52 cards.Cheryl draws out the 4 of hearts,shows the card to Cindy,and then lays it face down on the table in front of her.Asaad then extends the remaining cards for Cindy to make her selection.What is the probability that Cindy also will draw out a heart?

Accepted Answer

A) 0.25 
B) 0.24 
C) 0.02 
D) 0.20 
A) 0.25 
B) 0.24 
C) 0.02 
D) 0.20

Question 3

What is the probability of getting a sample mean between 500 and 520 if the population mean is 500 and the standard deviation of the sampling distribution (the standard error of the mean)is 20?

Accepted Answer

A) 0.5000 
B) 0.4332 
C) 0.3413 
D) 0.1915 
A) 0.5000 
B) 0.4332 
C) 0.3413 
D) 0.1915

Question 4

One hundred lottery tickets have been sold.You've purchased 30 tickets.What is the probability of one of your tickets being randomly selected?

Accepted Answer

A) 0.03 
B) 0.01 
C) 0.30 
D) 0.60 
A) 0.03 
B) 0.01 
C) 0.30 
D) 0.60

Question 5

An advertising executive wanted to know whether a new ad campaign designed to deter children from smoking was working.After seeing the ads,a randomly selected sample of 36 teenagers rated what they thought of smoking on a -5 (it's terrible)to +5 (it's fantastic).The mean rating for the sample was F1F1F1S1F1F1F100.70.The population mean is 0,with a population standard deviation of 2.00.What is the probability of obtaining a sample mean of F1F1F1S1F1F1F100.70 or lower (more negative)?

Accepted Answer

A) 0.0179 
B) 0.1368 
C) 0.3632 
D) 0.4821 
A) 0.0179 
B) 0.1368 
C) 0.3632 
D) 0.4821

Question 6

The mean of the population (   )is 200 on a test that measures math skills of middle school students.The variance   .The test scores for the students in Mr.Petris's class at Suburban Middle School are given below.Use a rejection region with a probability of 5% only in the upper tail.What should you conclude?

Accepted Answer

A) Since the z-value falls within the region of rejection,we should conclude this sample mean likely represents some other population. 
B) Since the z-value does not fall within the region of rejection,we should not conclude this sample mean represents some other population. 
C) Since the z-value falls within the region of rejection,we should not conclude this sample mean represents some other population. 
D) Since the z-value does not fall within the region of rejection,we should conclude this sample mean likely represents some other population. 
A) Since the z-value falls within the region of rejection,we should conclude this sample mean likely represents some other population. 
B) Since the z-value does not fall within the region of rejection,we should not conclude this sample mean represents some other population. 
C) Since the z-value falls within the region of rejection,we should not conclude this sample mean represents some other population. 
D) Since the z-value does not fall within the region of rejection,we should conclude this sample mean likely represents some other population.

Question 7

A student wanted to know whether memory for items on a grocery list was better when a bizarre image was created for each item,compared with a strategy of simply trying to remember the items.The student had a randomly selected sample use bizarre imagery to remember a list of 15 items;the mean number of items remembered was 10.The student compared this mean to a population mean of 7 and a standard error of 1.20.What is the probability of obtaining a sample mean of 10 or higher?

Accepted Answer

A) 0.0062 
B) 0.1151 
C) 0.4938 
D) 0.9938 
A) 0.0062 
B) 0.1151 
C) 0.4938 
D) 0.9938

Question 8

When a z-score is not in the region of rejection,we should

Accepted Answer

A) reject the idea that random chance produced a sample that represents the population poorly. 
B) conclude with the idea that the sample scores and the raw score population are similar enough to be called identical. 
C) not reject the idea that the sample represents the raw score population. 
D) reject the idea that the sample represents the raw score population. 
A) reject the idea that random chance produced a sample that represents the population poorly. 
B) conclude with the idea that the sample scores and the raw score population are similar enough to be called identical. 
C) not reject the idea that the sample represents the raw score population. 
D) reject the idea that the sample represents the raw score population.

Question 9

Why can we never be sure that a sample represents a population?

Accepted Answer

A) Random selection never works the way it is supposed to work. 
B) Samples created by random selection are almost never perfectly representative. 
C) A random sample may poorly represent a population,or it may accurately represent a different population. 
D) If selection is conducted correctly,samples always accurately represent the populations they are supposed to represent. 
A) Random selection never works the way it is supposed to work. 
B) Samples created by random selection are almost never perfectly representative. 
C) A random sample may poorly represent a population,or it may accurately represent a different population. 
D) If selection is conducted correctly,samples always accurately represent the populations they are supposed to represent.

Question 10

You roll a die (the singular of dice)twice,and both times you roll a 6.What type of events are these two rolls?

Accepted Answer

A) Biased 
B) Dependent 
C) Independent 
D) Likely 
A) Biased 
B) Dependent 
C) Independent 
D) Likely

Question 11

How is the relative frequency of an event defined?

Accepted Answer

A) The proportion of time an event does not occur in the population of events. 
B) The average number of time an event occurs in the population of events. 
C) The proportion of time an event occurs out of all events that might occur in the population. 
D) The proportion of time all events occur. 
A) The proportion of time an event does not occur in the population of events. 
B) The average number of time an event occurs in the population of events. 
C) The proportion of time an event occurs out of all events that might occur in the population. 
D) The proportion of time all events occur.

Question 12

When a sample mean is different from the mean of the sampling distribution (the population mean),two alternatives must be considered: The sample mean may represent _____,or it may represent _____.

Accepted Answer

A) the central tendency of a population well;the variability of a population well 
B) a well population;a poor population 
C) the population poorly;the population well 
D) the population poorly;a different population 
A) the central tendency of a population well;the variability of a population well 
B) a well population;a poor population 
C) the population poorly;the population well 
D) the population poorly;a different population

Question 13

What can we conclude about a sample mean that is found to lie in the region of rejection? It is extremely _____ to have occurred by chance,and it represents _____.

Accepted Answer

A) unlikely;the population 
B) likely;the population 
C) unlikely;some other population 
D) likely;some other population 
A) unlikely;the population 
B) likely;the population 
C) unlikely;some other population 
D) likely;some other population

Question 14

A study about the college aptitude of seniors at North City High School has resulted in a sample mean with a corresponding z-score of F1F1F1S1F1F1F102.00.If the critical value for the region of rejection is   ,what is the correct conclusion?

Accepted Answer

A) Since the z-value falls within the region of rejection,we should conclude this sample mean likely represents some other population. 
B) Since the z-value does not fall within the region of rejection,we should not conclude this sample mean represents some other population. 
C) Since the z-value falls within the region of rejection,we should not conclude this sample mean represents some other population. 
D) Since the z-value does not fall within the region of rejection,we should conclude this sample mean likely represents some other population. 
A) Since the z-value falls within the region of rejection,we should conclude this sample mean likely represents some other population. 
B) Since the z-value does not fall within the region of rejection,we should not conclude this sample mean represents some other population. 
C) Since the z-value falls within the region of rejection,we should not conclude this sample mean represents some other population. 
D) Since the z-value does not fall within the region of rejection,we should conclude this sample mean likely represents some other population.

Question 15

Which of the following best describes knowing the relative frequency of every possible event in a population?

Accepted Answer

A) A probability distribution 
B) A population distribution 
C) A frequency distribution 
D) A sample distribution 
A) A probability distribution 
B) A population distribution 
C) A frequency distribution 
D) A sample distribution

Question 16

When rolling a pair of fair dice,the probability of rolling a total point value of "7" is 0.17.If you rolled a pair of dice 1,000 times and the point value of "7" appeared 723 times,what would you probably conclude?

Accepted Answer

A) This is not so unlikely as to make you doubt the fairness of the dice. 
B) Although not impossible,this outcome is so unlikely that the fairness of these dice is questionable. 
C) Since the total point value of "7" has the highest probability of any event in the sampling distribution,this is an extremely likely outcome. 
D) It is impossible for this to happen if the dice are fair. 
A) This is not so unlikely as to make you doubt the fairness of the dice. 
B) Although not impossible,this outcome is so unlikely that the fairness of these dice is questionable. 
C) Since the total point value of "7" has the highest probability of any event in the sampling distribution,this is an extremely likely outcome. 
D) It is impossible for this to happen if the dice are fair.

A probability distribution gives us

What is the probability of getting a sample mean between 500 and 520 if the population mean is 500 and the standard deviation of the sampling distribution (the standard error of the mean)is 20?

One hundred lottery tickets have been sold.You've purchased 30 tickets.What is the probability of one of your tickets being randomly selected?

When a z-score is not in the region of rejection,we should

Why can we never be sure that a sample represents a population?

You roll a die (the singular of dice)twice,and both times you roll a 6.What type of events are these two rolls?

How is the relative frequency of an event defined?

When a sample mean is different from the mean of the sampling distribution (the population mean),two alternatives must be considered: The sample mean may represent _,or it may represent _.

What can we conclude about a sample mean that is found to lie in the region of rejection? It is extremely _ to have occurred by chance,and it represents _.

A study about the college aptitude of seniors at North City High School has resulted in a sample mean with a corresponding z-score of 2.00.If the critical value for the region of rejection is ,what is the correct conclusion?

Which of the following best describes knowing the relative frequency of every possible event in a population?

When rolling a pair of fair dice,the probability of rolling a total point value of "7" is 0.17.If you rolled a pair of dice 1,000 times and the point value of "7" appeared 723 times,what would you probably conclude?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

Exam 9: Using Probability to Make Decisions About Data

A probability distribution gives us

What is the probability of getting a sample mean between 500 and 520 if the population mean is 500 and the standard deviation of the sampling distribution (the standard error of the mean)is 20?

One hundred lottery tickets have been sold.You've purchased 30 tickets.What is the probability of one of your tickets being randomly selected?

When a z-score is not in the region of rejection,we should

Why can we never be sure that a sample represents a population?

You roll a die (the singular of dice)twice,and both times you roll a 6.What type of events are these two rolls?

How is the relative frequency of an event defined?

When a sample mean is different from the mean of the sampling distribution (the population mean),two alternatives must be considered: The sample mean may represent _____,or it may represent _____.

What can we conclude about a sample mean that is found to lie in the region of rejection? It is extremely _____ to have occurred by chance,and it represents _____.

A study about the college aptitude of seniors at North City High School has resulted in a sample mean with a corresponding z-score of 2.00.If the critical value for the region of rejection is ,what is the correct conclusion?

Which of the following best describes knowing the relative frequency of every possible event in a population?

When rolling a pair of fair dice,the probability of rolling a total point value of "7" is 0.17.If you rolled a pair of dice 1,000 times and the point value of "7" appeared 723 times,what would you probably conclude?

Introduction to Statistics

Statistics and the Research Process

Frequency Distributions and Percentiles

Measures of Central Tendency;the Mean, median, and Mode

Measures of Variability: Range, variance, and Standard Deviation

Z-Scores and the Normal Curve

The Correlation Coefficient

Linear Regression

Introduction to Hypothesis Testing

Performing the One-Sample T-Test and Testing Correlation Coefficients

The Two-Sample T-Test

The One-Way Analysis of Variance

The Two-Way Analysis of Variance

Chi Square and Other Nonparametric Procedures

Filters

When a sample mean is different from the mean of the sampling distribution (the population mean),two alternatives must be considered: The sample mean may represent _,or it may represent _.

What can we conclude about a sample mean that is found to lie in the region of rejection? It is extremely _ to have occurred by chance,and it represents _.