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# STAT 230 Week 1 Answers Only

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Questions

3. If you are told only that you scored in the 80th percentile, do you know from that description exactly how it was calculated? Explain.

10.

For the numbers 1, 2, 4, 16 compute the following:

SUM X

SUM X^2

(SUM X)^2

17. (AT) What is the independent variable of this experiment? How many levels

does it have?

18. (AT) What is the dependent variable? On what scale (nominal, ordinal, interval,

ratio) was it measured?

50.** **What is the population she is interested in?

52.** **The instructor’s sample produces a mean number of days absent of 3.5 days. This value is an example of

72.** **A study was done to determine the age, number of times per week, and the duration (amount of time) of residents using a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every eighth house in the neighborhood around the park was interviewed. The sampling method was:

80. Fifty part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below:

# of Courses

Frequency

Relative Frequency

Cumulative Relative Frequency

1

30

0.6

2

15

3

Table 1.33 Part-time Student Course Loads

1. Fill in the blanks in Table 1.33.

2. What percent of students take exactly two courses?

3. What percent of students take one or two courses?

84. Forbes magazine published data on the best small firms in 2012. These were firms which had been publicly traded for at least a year, have a stock price of at least $5 per share, and have reported annual revenue between $5 million and $1 billion. Table 1.37 shows the ages of the chief executive officers for the first 60 ranked firms.

Age

Frequency

Relative Frequency

Cumulative Relative Frequency

40–44

3

45–49

11

50–54

13

Table 1.37

56 CHAPTER 1 | SAMPLING AND DATA

Age

Frequency

Relative Frequency

Cumulative Relative Frequency

55–59

16

60–64

10

65–69

6

70–74

1

(a)

(b)

a. b. c. d. e.

Table 1.37

What is the frequency for CEO ages between 54 and 65?

What percentage of CEOs are 65 years or older?

What is the relative frequency of ages under 50?

What is the cumulative relative frequency for CEOs younger than 55?

Which graph shows the relative frequency and which shows the cumulative relative frequency

90. Seven hundred and seventy-one distance learning students at Long Beach City College responded to surveys in the 2010-11 academic year. Highlights of the summary report are listed in Table 1.39.

Have computer at home

96%

Unable to come to campus for classes

65%

Age 41 or over

24%

Would like LBCC to offer more DL courses

95%

Took DL classes due to a disability

17%

Live at least 16 miles from campus

13%

Took DL courses to fulfill transfer requirements

71%

Table 1.39 LBCC Distance Learning Survey Results

- What percent of the students surveyed do not have a computer at home?
- About how many students in the survey live at least 16 miles from campus?
- If the same survey were done at Great Basin College in Elko, Nevada, do you think the percentages would be the

same? Why?

## [Solved] STAT 230 Week 1 Answers Only

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