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Homework answers / question archive /   Chapter 01, Testbank, Question 012 A quantitative variable is the only type of variable that can:   assume numeric values for which arithmetic operations make sense   have no intermediate values   be graphed   be used to prepare tables                       Chapter 01, Testbank, Question 015 A qualitative variable is the only type of variable that:   can assume an uncountable set of values   cannot be measured numerically   can assume numerical values   cannot be graphed               SUBMIT ANSWER               Chapter 02, Testbank, Question 067-072 The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city

  Chapter 01, Testbank, Question 012 A quantitative variable is the only type of variable that can:   assume numeric values for which arithmetic operations make sense   have no intermediate values   be graphed   be used to prepare tables                       Chapter 01, Testbank, Question 015 A qualitative variable is the only type of variable that:   can assume an uncountable set of values   cannot be measured numerically   can assume numerical values   cannot be graphed               SUBMIT ANSWER               Chapter 02, Testbank, Question 067-072 The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city

Math

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Chapter 01, Testbank, Question 012

A quantitative variable is the only type of variable that can:

 

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assume numeric values for which arithmetic operations make sense

 

have no intermediate values

 

be graphed

 

be used to prepare tables

 

 

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Chapter 01, Testbank, Question 015

A qualitative variable is the only type of variable that:

 

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can assume an uncountable set of values

 

cannot be measured numerically

 

can assume numerical values

 

cannot be graphed

 

 

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SUBMIT ANSWER

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Chapter 02, Testbank, Question 067-072

The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.

Time (minutes)

f

0 to less than 10

64

0 to less than 20

157

0 to less than 30

222

0 to less than 40

288

0 to less than 50

352

0 to less than 60

400

The sample size is:

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The percentage of persons who commute for less than 30 minutes, rounded to two decimal places, is:

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif%

The cumulative relative frequency of the fourth class, rounded to four decimal places, is:

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The percentage of persons who commute for 40 or more minutes, rounded to two decimal places, is:

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif%

The percentage of persons who commute for less than 50 minutes, rounded to two decimal places, is:

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif%

The number of persons who commute for 20 or more minutes is:

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Chapter 03, Testbank, Question 027-029

The temperatures (in degrees Fahrenheit) observed during seven days of summer in Los Angeles are:

78    99    68    91    106    75    85

The range of these temperatures is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

The variance of these temperatures, rounded to three decimals, is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

The standard deviation, rounded to three decimals, of these temperatures is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

 

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SUBMIT ANSWER

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Chapter 04, Testbank, Question 021-026

The following table gives the two-way classification of 500 students based on sex and whether or not they suffer from math anxiety.

 

Suffer From Math Anxiety

 

Sex

Yes

No

Male

200

40

Female

135

125

 

If you randomly select one student from these 500 students, the probability that this selected student is a female is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif (round your answer to three decimal places, so 0.0857 would be 0.086)

 

If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif (round your answer to three decimal places, so 0.0857 would be 0.086)

 

If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety, given that he is a male is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif(round your answer to three decimal places, so 0.0857 would be 0.086)

 

If you randomly select one student from these 500 students, the probability that this selected student is a female, given that she does not suffer from math anxiety is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif (round your answer to three decimal places, so 0.0857 would be 0.086)

 

Which of the following pairs of events are mutually exclusive?

 

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Male and yes

 

Female and no

 

No and yes

 

Female and yes

 

Female and male

 

Male and no

Are the events "Has math anxiety" and "Person is female" independent or dependent? Detail the calculations you performed to determine this.

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Chapter 05, Testbank, Question 009

For the probability distribution of a discrete random variable x, the sum of the probabilities of all values of x must be:

 

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equal to zero

 

in the range zero to 1

 

equal to 1

 

equal to 0.5

 

 

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SUBMIT ANSWER

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Chapter 05, Testbank, Question 034-035

The following table lists the probability distribution of a discrete random variable x:

x

2

3

4

5

6

7

8

P(x)

0.15

0.29

0.20

0.13

0.15

0.06

0.02

The mean of the random variable x is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif.

The standard deviation of the random variable x, rounded to three decimal places, is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif.

 

 

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Chapter 06, Testbank, Question 036-038

The daily sales at a convenience store produce a distribution that is approximately normal with a mean of 1260 and a standard deviation of 147.

The probability that the sales on a given day at this store are more than $1,405, rounded to four decimal places, is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif.

The probability that the sales on a given day at this store are less than $1,305, rounded to four decimal places, is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif.

The probability that the sales on a given day at this store are between $1,200 and $1,300, rounded to four decimal places, is: https://edugen.wileyplus.com/edugen/art2/common/pixel.gif.

 

 

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SUBMIT ANSWER

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Chapter 08, Testbank, Question 010

The width of a confidence interval depends on the size of the:

 

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population mean

 

margin of error

 

sample mean

 

none of these

 

 

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SUBMIT ANSWER

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Chapter 08, Testbank, Question 014

A sample of size 84 from a population having standard deviation σ = 46 produced a mean of 261.00. The 95% confidence interval for the population mean (rounded to two decimal places) is:

 

The lower limit is https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

The upper limit is https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 001

The null hypothesis is a claim about a:

 

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population parameter, where the claim is assumed to be true until it is declared false

 

population parameter, where the claim is assumed to be false until it is declared true

 

statistic, where the claim is assumed to be false until it is declared true

 

statistic, where the claim is assumed to be true until it is declared false

 

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 002

The alternative hypothesis is a claim about a:

 

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statistic, where the claim is assumed to be true if the null hypothesis is declared false

 

statistic, where the claim is assumed to be false until it is declared true

 

population parameter, where the claim is assumed to be true until it is declared false

 

population parameter, where the claim is assumed to be true if the null hypothesis is declared false

 

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 003

In a one-tailed hypothesis test, a critical point is a point that divides the area under the sampling distribution of a:

 

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population parameter into two rejection regions and one nonrejection region

 

population parameter into one rejection region and one nonrejection region

 

statistic into one rejection region and two nonrejection regions

 

statistic into one rejection region and one nonrejection region

 

 

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Chapter 09, Testbank, Question 004

In a two-tailed hypothesis test, the two critical points are the points that divide the area under the sampling distribution of a:

 

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

statistic into two rejection regions and one nonrejection region

 

population parameter into two rejection regions and one nonrejection region

 

statistic into one rejection region and two nonrejection regions

 

population parameter into one rejection region and one nonrejection region

 

 

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 005

In a hypothesis test, a Type I error occurs when:

 

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a true null hypothesis is not rejected

 

a true null hypothesis is rejected

 

a false null hypothesis is not rejected

 

a false null hypothesis is rejected

 

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 006

In a hypothesis test, a Type II error occurs when:

 

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a true null hypothesis is rejected

 

a false null hypothesis is rejected

 

a true null hypothesis is not rejected

 

a false null hypothesis is not rejected

 

 

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https://edugen.wileyplus.com/edugen/art2/common/pixel.gif

 

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SUBMIT ANSWER

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Chapter 09, Testbank, Question 007

In a hypothesis test, the probability of committing a Type I error is called the:

 

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confidence interval

 

significance level

 

confidence level

 

beta error

 

 

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SUBMIT ANSWER

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