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Chapter 2: Q79E (page 111)

Parents Against Watching Television.A society called Parents Against Watching Television (PAWT) is primarily concerned with the amount of television viewed by today鈥檚 youth. It asked 300 parents of elementary school aged children to estimate the number of hours their child spent watching television in any given week. The mean and the standard deviation for their responses were 17 and 3, respectively. PAWT then constructed a stem-and-leaf display for the data, which showed that the distribution of the number of hours was a symmetric, mound-shaped distribution. Identify the interval where you believe approximately 95% of the television viewing times fell in the distribution.

Short Answer

Expert verified

11 to 23 hours is the interval where 95% of viewing time falls.

Step by step solution

01

Identifying the interval where approx. 95% of television viewing time fell

We have the mean and standard deviation as 17 and 3, respectively.

According to the Empirical Rule, 95% of measurements fall between the 2 standard deviation from mean. Therefore, we have the value of k.

Now we will use the values of mean, s and k to find the intervals.

x炉卤2sUpperrange=x炉+2s=17+2(3)=17+6=23Lowerrange=x炉-2s=17-2(3)=17-6=11

Therefore, 95% of the television viewing time falls between 11 to 23 hours.

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Most popular questions from this chapter

Business marketing publications.Business-to-business marketing describes the field of marketing between multiple business entities. The Journal of Business-to-Business Marketing (Vol. 15, 2008) produced a pie chart describing the number of business-to-business marketing articles published in all journals, by topical area, between 1971 and 2006. The data used to produce the pie chart are shown in the table.

Area

Number

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Buyer Behavior

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Innovation

Marketing Strategy

Channels/Distribution

Marketing Research

Services

235

494

478

498

398

280

213

131

136

Total

2,863

a.Compute the relative frequencies for the nine topical areas shown in the table. Interpret the relative frequency for Buyer Behavior.

b.Use the relative frequencies, part a, to construct a pie chart for the data. Why is the slice for Marketing Research smaller than the slice for Sales Management?

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Descriptive Statistics: Ratings

Results for Prize = Job

Variable

Degree

N

Mean

StDev

Minimum

Maximum

Rating

First

54

7.796

4.231

1.000

17

None

35

7.457

4.388

1.000

20

Post

10

9.80

4.54

2.000

17

Results for Prize = Partnership

Variable

Degree

N

Mean

StDev

Minimum

Maximum

Rating

First

33

8.212

4.775

1.000

20.00

None

21

10.62

4.83

3.000

20.00

Post

6

6.50

3.33

2.000

12.00

a.Give a practical interpretation of the mean rating for contestants with a first (bachelor鈥檚) degree who competed for a job with Lord Sugar.

b.Find an interval that captures about 95% of the ratings for contestants with a first (bachelor鈥檚) degree who competed for a job with Lord Sugar.

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Ecolabel

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Energy Star

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3.57

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2.28

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Building Council Green Business

2.25

1.39

Green Key

2.01

1.30
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