BUS309 Homework 1

The study of statistics is NOT about

A) the language of data.

B) the art and science of getting information from data.

C) the study of collecting, analyzing, presenting, and interpreting data.

D) the study of mind and consciousness

the study of mind and consciousness

The two branches of the study of statistics are generally referred to as

A) descriptive and inferential statistics.

B) inferential and differential statistics.

C) descriptive and referential statistics.

D) differential and descriptive statistics

descriptive and inferential statistics

Which of the following represents a population and a sample from that population?

A) Attendees at a sporting event, and those who purchased popcorn at said sporting event

B) Full-time employees at a marketing firm, and temporary summer interns at the marketing firm

C) Seniors at Boston College and students in a first-semester business statistics course

D) Stocks available on the NYSE and stocks on the NASDAQ

Attendees at a sporting event, and those who purchased popcorn at said sporting event

The values of data on a(n)__________ scale can be categorized and ranked.

A) ordinal

B) nominal

C) ratio

D) interval

ordinal

Differences between categories are meaningless with__________ data

A) ordinal

B) interval

C) ratio

D) continuous

ordinal

The data represents the stock price for Google at the end of the past four quarters. Which of the following types of data best describe these values?

A) Cross-sectional

B) Nominal

C) Time series

D) Ordinal

Time series

What is the scale of measurement of the distance between any two locations?

A) Ratio scale

B) Ordinal scale

C) Interval scale

D) Nominal scale

Ratio scale

In order to summarize a categorical variable, a useful tool is to use a __________.

A) histogram

B) frequency distribution

C) stem-and-leaf diagram

D) line chart

frequency distribution

An auto parts chain asked customers to complete a survey rating the chain's customer service as average, above average, or below average. The following table shows the results from the survey:

Average | Below Average | Average

Above Average | Above Average | Above Average

Below Average | Average | Average

Below Average | Average | Below Average

Below Average | Below Average | Below Average

The proportion of customers who felt the customer service was Average is the closest to __________.

A) 0.20

B) 0.33

C) 0.46

D) 0.53

0.33

When constructing a frequency distribution for a numerical variable, it is important to remember that __________.

A) intervals are mutually exclusive

B) intervals are overlapping

C) the total number of intervals cannot exceed 15

D) the total number of intervals should be at least 100

intervals are mutually exclusive

The scores on a pop quiz in a statistics section are displayed in the accompanying table as well as Excel date file.

45 66 74 72 62 44 55 70 33 82

56 56 84 16 16 47 32 32 17 37

Suppose the data are grouped into five intervals, and one of them will be "30 up to 44"—that is, {x; 30 ≤ x < 44}. The frequency of this interval is __________.

A) 0.20

B) 0.25

C) 4

D) 5

4

Thirty students at Eastside High School took the SAT on the same Saturday. Their raw scores are displayed in the accompanying table as well as Excel date file.

1,450 1,620 1,800 1,740 1,650 1,710 1,900 1,910 1,950 1,820

1,800 2,010 1,780 1,840 1,490 1,590 2,350 2,260 1,870 1,530

1,620 1,480 2,390 1,640 1,830 1,950 2,000 1,830 1,980 2,100

Consider a frequency distribution of the data that groups the data in intervals of 1,400 up to 1,600, 1,600 up to 1,800, 1,800 up to 2,000, and so on. What is the approximate relative frequency of students who scored more than 1,600 but less than 1,800?

A) 0.17

B) 0.23

C) 0.40

D) 0.77

0.23

The accompanying table shows students' scores from the final exam in a history course.

Scores Cumulative Frequency

50 up to 60 12

60 up to 70 33

70 up to 80 64

80 up to 90 88

90 up to 100 100

How many of the students scored at least 70 but less than 90?

A) 24

B) 31

C) 55

D) 88

55

The Statistical Abstract of the United States provided the following frequency distribution of the number of people who live below the poverty level by region.

Region Number of People (in 1000s)

Northeast 6,166

Midwest 7,237

South 15,501

West 8,372

What is the percentage of people who live below the poverty level in the West or Midwest?

A) 35.96%

B) 41.87%

C) 41.58%

D) 31.96%

41.87%

The scores on a pop quiz in a statistics section are displayed in the accompanying table as well as Excel date file.

45 66 74 72 62 44 55 70 33 82

56 56 84 16 16 47 32 32 17 37

Suppose the data are grouped into five intervals, and one of them will be "30 up to 44"—that is, {x; 30 ≤ x < 44}. The frequency of this interval is __________.

A) 0.20

B) 0.25

C) 4

D) 5

4