Question 1

A z score of -1.05 is not possible.

Accepted Answer

A) True 
 B)False

Question 2

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles.
-Refer to Data Set 7-1. The probability of drawing a blue marble is

Accepted Answer

A)  .20 
B)  .25 
C)  5 
D)  none of the other alternatives are correct. 
A)  .20 
B)  .25 
C)  5 
D)  none of the other alternatives are correct.

Question 3

In a special game of cards, there were 20 blues, 15 reds, 10 greens, and 5 whites.
a. What is the probability of drawing a blue card at random?
b. What is the probability of drawing a blue or a green card?
c. Draw a theoretical distribution of the probabilities of the four kinds of cards.

Accepted Answer

a.
 @#LAT-DLM& =.40 = probabil

Question 4

Suppose the mean of a particular normal distribution is 3.95. The median of this distribution will be

Accepted Answer

A)  larger than 3.95 
B)  smaller than 3.95 
C)  3.95 
D)  not determinable from the information given. 
A)  larger than 3.95 
B)  smaller than 3.95 
C)  3.95 
D)  not determinable from the information given.

Question 5

What is the probability of drawing a card larger than a 9 (excluding aces) from an ordinary deck of playing cards? Describe how you arrived at your answer.

Accepted Answer

4 cards: 1

Question 6

The area under part of a theoretical curve is also

Accepted Answer

A)  the mean of the curve 
B)  the standard deviation of the curve 
C)  the probability of events covered by that area of the curve. 
A)  the mean of the curve 
B)  the standard deviation of the curve 
C)  the probability of events covered by that area of the curve.

Question 7

Which is not true for the normal curve?

Accepted Answer

A)  The area under the curve is always 1.00. 
B)  The curve is skewed. 
C)  The tails of the curve are asymptotic to the X axis. 
D)  The points of inflection in the curve lie at +l$\sigma$ and -l$\sigma$. 
A)  The area under the curve is always 1.00. 
B)  The curve is skewed. 
C)  The tails of the curve are asymptotic to the X axis. 
D)  The points of inflection in the curve lie at +l$\sigma$ and -l$\sigma$.

Question 8

A rectangular distribution is an example of a normal distribution.

Accepted Answer

A) True 
 B)False

Question 9

A characteristic that always distinguishes an empirical from a theoretical curve is

Accepted Answer

A)  the smoothness of the curve or line that connects the points 
B)  how the points on the curve were obtained 
C)  whether the curve actually crosses the X axis or not 
D)  all of the other alternatives are correct. 
A)  the smoothness of the curve or line that connects the points 
B)  how the points on the curve were obtained 
C)  whether the curve actually crosses the X axis or not 
D)  all of the other alternatives are correct.

Question 10

Each alternative below gives a distance on the baseline of the normal curve in standard deviation units. Choose the limits that mark off the smallest proportion of the normal curve.

Accepted Answer

A)  -3$\sigma$ to -2$\sigma$ 
B)  -l$\sigma$ to 0 
C)  -l$\sigma$to l$\sigma$ 
D)  l$\sigma$ to 2$\sigma$. 
A)  -3$\sigma$ to -2$\sigma$ 
B)  -l$\sigma$ to 0 
C)  -l$\sigma$to l$\sigma$ 
D)  l$\sigma$ to 2$\sigma$.

Question 11

a.Over the years, the scores on the final exam in General Psychology have been normally distributed with a mean of 75 and a standard deviation of 8. What proportion would be expected to score between 70 and 85?b. For the problem above, what scores separate the upper 1/2% and the lower 1/2% from the rest of the population?

Accepted Answer

a. \[\begin{array} { l } 
z = \frac { 70

Question 12

The diameters of the trees in a stand of 100-year-old Ponderosa Pines are normally distributed with a mean of 15 inches and a standard deviation of 4 inches. If only trees with diameters of 8 inches or more are marketable, what proportion of the stand is marketable?

Accepted Answer

z =
 @#LAT-DLM& = -1.75; propo

Question 13

Suppose a population was normally distributed with $\mu$  = 10 and $\sigma$ = 2.
a. What proportion of the scores would lie between 7.5 and 12.5?
b. What proportion would lie between 7.5 and 10.5?
c. What proportion would lie between 10.5 and 12.5?
d. What score would separate the lower 40% of the population from the upper 60%?
e. If there were 250 members of the population, how many would be expected to score 11 or more?
f. What proportion would be expected to score 9 or more?g. Does this problem deal with a theoretical or an empirical distribution?

Accepted Answer

a. \[\begin{array} { l } 
z = \frac { 7.

Question 14

When a theoretical distribution is used to assess probability, the area under the curve is considered to be

Accepted Answer

A)  0.00 
B)  1.00 
C)  2.00 
D)  any of the other alternatives are possible. 
A)  0.00 
B)  1.00 
C)  2.00 
D)  any of the other alternatives are possible.

Question 15

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50.
-Use Table C and Data Set 7-5. The proportion of the population with scores less than 0 is

Accepted Answer

A)  .0000 
B)  .9987 
C)  .4987 
D)  .0013 
A)  .0000 
B)  .9987 
C)  .4987 
D)  .0013

Question 16

If an urn contains 2 red balls, 2 blue balls, and 1 green ball, the probability of drawing a blue ball is .20.

Accepted Answer

A) True 
 B)False

Question 17

The denominator of the z score in Chapter 7 is a standard deviation.

Accepted Answer

A) True 
 B)False

Question 18

Empirical distributions are based on mathematics and logic.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is a theoretical distribution?

Accepted Answer

A)  your statistics professor stayed in the residence hall one Friday night and flipped a coin 10,000 times. The number of heads and tails was recorded. 
B)  The price of every house sold in the last five years in Hampden County was obtained from courthouse records. 
C)  The number of persons who arrived late was recorded every time a statistics course met during the semester. 
D)  None of the other alternatives are correct. 
A)  your statistics professor stayed in the residence hall one Friday night and flipped a coin 10,000 times. The number of heads and tails was recorded. 
B)  The price of every house sold in the last five years in Hampden County was obtained from courthouse records. 
C)  The number of persons who arrived late was recorded every time a statistics course met during the semester. 
D)  None of the other alternatives are correct.

Question 20

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50.
-The proportion of the population of scores in Data Set 7-5 that is between 100 and 175 would be

Accepted Answer

A)  .3413 
B)  .1915 
C)  .1498 
D)  .4706 
A)  .3413 
B)  .1915 
C)  .1498 
D)  .4706

A z score of -1.05 is not possible.

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles. -Refer to Data Set 7-1. The probability of drawing a blue marble is

In a special game of cards, there were 20 blues, 15 reds, 10 greens, and 5 whites. a. What is the probability of drawing a blue card at random? b. What is the probability of drawing a blue or a green card? c. Draw a theoretical distribution of the probabilities of the four kinds of cards.

Suppose the mean of a particular normal distribution is 3.95. The median of this distribution will be

What is the probability of drawing a card larger than a 9 (excluding aces) from an ordinary deck of playing cards? Describe how you arrived at your answer.

The area under part of a theoretical curve is also

Which is not true for the normal curve?

A rectangular distribution is an example of a normal distribution.

A characteristic that always distinguishes an empirical from a theoretical curve is

Each alternative below gives a distance on the baseline of the normal curve in standard deviation units. Choose the limits that mark off the smallest proportion of the normal curve.

The diameters of the trees in a stand of 100-year-old Ponderosa Pines are normally distributed with a mean of 15 inches and a standard deviation of 4 inches. If only trees with diameters of 8 inches or more are marketable, what proportion of the stand is marketable?

When a theoretical distribution is used to assess probability, the area under the curve is considered to be

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -Use Table C and Data Set 7-5. The proportion of the population with scores less than 0 is

If an urn contains 2 red balls, 2 blue balls, and 1 green ball, the probability of drawing a blue ball is .20.

The denominator of the z score in Chapter 7 is a standard deviation.

Empirical distributions are based on mathematics and logic.

Which of the following is a theoretical distribution?

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -The proportion of the population of scores in Data Set 7-5 that is between 100 and 175 would be

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters

Exam 7: Theoretical Distributions Including the Normal Distribution

A z score of -1.05 is not possible.

Data Set 7-1: Suppose an urn (a kind of jar that seems to be the best natural habitat for marbles) contained 3 red, 6 black, 5 blue, 2 yellow and 4 green marbles. -Refer to Data Set 7-1. The probability of drawing a blue marble is

In a special game of cards, there were 20 blues, 15 reds, 10 greens, and 5 whites. a. What is the probability of drawing a blue card at random? b. What is the probability of drawing a blue or a green card? c. Draw a theoretical distribution of the probabilities of the four kinds of cards.

Suppose the mean of a particular normal distribution is 3.95. The median of this distribution will be

What is the probability of drawing a card larger than a 9 (excluding aces) from an ordinary deck of playing cards? Describe how you arrived at your answer.

The area under part of a theoretical curve is also

Which is not true for the normal curve?

A rectangular distribution is an example of a normal distribution.

A characteristic that always distinguishes an empirical from a theoretical curve is

Each alternative below gives a distance on the baseline of the normal curve in standard deviation units. Choose the limits that mark off the smallest proportion of the normal curve.

The diameters of the trees in a stand of 100-year-old Ponderosa Pines are normally distributed with a mean of 15 inches and a standard deviation of 4 inches. If only trees with diameters of 8 inches or more are marketable, what proportion of the stand is marketable?

When a theoretical distribution is used to assess probability, the area under the curve is considered to be

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -Use Table C and Data Set 7-5. The proportion of the population with scores less than 0 is

If an urn contains 2 red balls, 2 blue balls, and 1 green ball, the probability of drawing a blue ball is .20.

The denominator of the z score in Chapter 7 is a standard deviation.

Empirical distributions are based on mathematics and logic.

Which of the following is a theoretical distribution?

Data Set 7-5: Suppose you knew that a population had a mean of 150 and a standard deviation of 50. -The proportion of the population of scores in Data Set 7-5 that is between 100 and 175 would be

Introduction

Exploring Data: Frequency Distributions and Graphs

Exploring Data: Central Tendency

Exploring Data: Variability

Other Descriptive Statistics

Correlation and Regression

Samples, Sampling Distributions, and Confidence Intervals

Hypothesis Testing and Effect Size: One-Sample Designs

Hypothesis Testing, Effect Size, and and Confidence Intervals: Two-Sample Designs

Analysis of Variance: One-Way Classification

Analysis of Variance: One-Factor Repeated Measures

Analysis of Variance: Factorial Design

Chi Square Tests

More Nonparametric Tests

Appendix: Grouped Frequency Distributions and Central Tendency

Filters