Question 1

If the odds against an event are 5 to 1, the probability of its occurrence is

Accepted Answer

A)  .17 
B)  .05 
C)  .01 
D)  .25 
A)  .17 
B)  .05 
C)  .01 
D)  .25

Question 2

A probability value of .25 means that an event will occur

Accepted Answer

A)  once out of 25 times 
B)  25 times out of 100 
C)  once out of 5 times 
D)  75 times out of 100 
A)  once out of 25 times 
B)  25 times out of 100 
C)  once out of 5 times 
D)  75 times out of 100

Question 3

The probability of obtaining a z score of 0 or above is

Accepted Answer

A)  0 
B)  .16 
C)  .34 
D)  .50 
A)  0 
B)  .16 
C)  .34 
D)  .50

Question 4

The reason z scores may be used to calculate probabilities is that

Accepted Answer

A)  frequencies are easily converted into probabilities 
B)  all z scores are independent of each other 
C)  all z scores are included within a standard deviation unit (plus or minus) of the mean 
D)  all z scores are included within 2 standard deviation units (plus or minus) 
A)  frequencies are easily converted into probabilities 
B)  all z scores are independent of each other 
C)  all z scores are included within a standard deviation unit (plus or minus) of the mean 
D)  all z scores are included within 2 standard deviation units (plus or minus)

Question 5

The probability of any event falling within one standard deviation of the mean (plus or minus) is .

Accepted Answer

A) True 
 B)False

Question 6

When events are included between two negative z scores the probability value for those events must be less than .50.

Accepted Answer

A) True 
 B)False

Question 7

At a certain race track, the horses run the mile in an average time of 135 seconds, with an SD of 13 seconds. What is the probability of selecting at random a horse that could run the mile in 130 seconds or less?

Accepted Answer

The answer of At a certain race track, the horses...

Question 8

If the odds against an event are 3 to 1, the probability of its occurrence is

Accepted Answer

A)  .17 
B)  .05 
C)  .01 
D)  .25 
A)  .17 
B)  .05 
C)  .01 
D)  .25

Question 9

Using data from the previous problem, what is the probability of selecting an inmate who had NOT recidivated?

Accepted Answer

A)  .36 
B)  .64 
C)  .50 
D)  .46. 
A)  .36 
B)  .64 
C)  .50 
D)  .46.

Question 10

The probability of obtaining a z score of +1.00 or higher, is

Accepted Answer

A)  1.00 
B)  .16 
C)  .84 
D)  .34 
A)  1.00 
B)  .16 
C)  .84 
D)  .34

Question 11

Using data from the previous problem, what is the probability of selecting at random a participant who had had a losing evening?

Accepted Answer

A)  .12 
B)  .24 
C)  .48 
D)  .88 
A)  .12 
B)  .24 
C)  .48 
D)  .88

Question 12

The mean is 55 with an SD of 15. What is the probability of selecting at random a score which falls between 60 and 65?

Accepted Answer

The answer of The mean is 55 with an SD...

Question 13

No probability value may ever be greater than

Accepted Answer

A)  1.00 
B)  .99 
C)  0 
D)  there is no upper limit to the size of a given probability value 
A)  1.00 
B)  .99 
C)  0 
D)  there is no upper limit to the size of a given probability value

Question 14

When events cannot influence or be influenced by other events, they are said to be

Accepted Answer

A)  low-probability events 
B)  high-probability events 
C)  chance events 
D)  independent events 
A)  low-probability events 
B)  high-probability events 
C)  chance events 
D)  independent events

Question 15

With a mean of 40 and an SD of 20.45, what is the probability of selecting at random a score of 45 or higher?

Accepted Answer

The answer of With a mean of 40 and an...

Question 16

Under the normal curve, the exclusion of the most extreme scores refers only to the highest scores in the distribution.

Accepted Answer

A) True 
 B)False

Question 17

The probability of any event occurring above the mean is at least .68.

Accepted Answer

A) True 
 B)False

Question 18

Under the normal curve, the probability of any score falling below the 50th percentile, is

Accepted Answer

A)  0 
B)  .16 
C)  -.50 
D)  .50 
A)  0 
B)  .16 
C)  -.50 
D)  .50

Question 19

At a certain college, the mean college-board score in math is 400 with an SD of 97. What is the probability of selecting at random a student who scored between 370 and 450?

Accepted Answer

The answer of At a certain college, the mean college-board...

Question 20

Probability is based on how often a given event

Accepted Answer

A)  will occur out of 100 
B)  will occur out of 52 times 
C)  will occur just once 
D)  will not occur at all 
A)  will occur out of 100 
B)  will occur out of 52 times 
C)  will occur just once 
D)  will not occur at all

If the odds against an event are 5 to 1, the probability of its occurrence is

A probability value of .25 means that an event will occur

The probability of obtaining a z score of 0 or above is

The reason z scores may be used to calculate probabilities is that

The probability of any event falling within one standard deviation of the mean (plus or minus) is .

When events are included between two negative z scores the probability value for those events must be less than .50.

At a certain race track, the horses run the mile in an average time of 135 seconds, with an SD of 13 seconds. What is the probability of selecting at random a horse that could run the mile in 130 seconds or less?

If the odds against an event are 3 to 1, the probability of its occurrence is

Using data from the previous problem, what is the probability of selecting an inmate who had NOT recidivated?

The probability of obtaining a z score of +1.00 or higher, is

Using data from the previous problem, what is the probability of selecting at random a participant who had had a losing evening?

The mean is 55 with an SD of 15. What is the probability of selecting at random a score which falls between 60 and 65?

No probability value may ever be greater than

When events cannot influence or be influenced by other events, they are said to be

With a mean of 40 and an SD of 20.45, what is the probability of selecting at random a score of 45 or higher?

Under the normal curve, the exclusion of the most extreme scores refers only to the highest scores in the distribution.

The probability of any event occurring above the mean is at least .68.

Under the normal curve, the probability of any score falling below the 50th percentile, is

At a certain college, the mean college-board score in math is 400 with an SD of 97. What is the probability of selecting at random a student who scored between 370 and 450?

Probability is based on how often a given event

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Statistics and Parameters

Parameter Estimates

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters

Exam 6: Probability

If the odds against an event are 5 to 1, the probability of its occurrence is

A probability value of .25 means that an event will occur

The probability of obtaining a z score of 0 or above is

The reason z scores may be used to calculate probabilities is that

The probability of any event falling within one standard deviation of the mean (plus or minus) is .

When events are included between two negative z scores the probability value for those events must be less than .50.

At a certain race track, the horses run the mile in an average time of 135 seconds, with an SD of 13 seconds. What is the probability of selecting at random a horse that could run the mile in 130 seconds or less?

If the odds against an event are 3 to 1, the probability of its occurrence is

Using data from the previous problem, what is the probability of selecting an inmate who had NOT recidivated?

The probability of obtaining a z score of +1.00 or higher, is

Using data from the previous problem, what is the probability of selecting at random a participant who had had a losing evening?

The mean is 55 with an SD of 15. What is the probability of selecting at random a score which falls between 60 and 65?

No probability value may ever be greater than

When events cannot influence or be influenced by other events, they are said to be

With a mean of 40 and an SD of 20.45, what is the probability of selecting at random a score of 45 or higher?

Under the normal curve, the exclusion of the most extreme scores refers only to the highest scores in the distribution.

The probability of any event occurring above the mean is at least .68.

Under the normal curve, the probability of any score falling below the 50th percentile, is

At a certain college, the mean college-board score in math is 400 with an SD of 97. What is the probability of selecting at random a student who scored between 370 and 450?

Probability is based on how often a given event

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Statistics and Parameters

Parameter Estimates

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters