BUSA320 Statistics: file1 study review and file2. exam review

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BUSA320 : Statistics for Decision-Making

Textbook : BSTAT 2nd with Review Cards+ Aplia

Author: Keller

Publisher: Cengage Learning

1) Pets Survey

Families were asked how many pets they owned. Their responses are summarized in the following table.

Number of Pets

0

1

2

3

4

5

Frequency

3

20

5

4

2

2

a) How many families are represented in this survey?

ANS:

b) Across all families, how many total pets did they own?

ANS:

c)What proportion of families owned 3 pets?

ANS:

2) Hours Worked per Week

The following data represent the hours worked per week of a sample of 25 employees from a government department: 31, 43, 56, 23, 49, 42, 33, 61, 44, 28, 48, 38, 44, 35, 40, 64, 52, 42, 47, 39, 53, 27, 36, 35, and 20.

a) Construct a stem and leaf display for the hours.

ANS:

Stem

Leaf

b) Find the median hours.

ANS:

c) Compute the sample mean hours.

d) Find the modal hours.

ANS:

e) Compare the mean and median hours for these employees and use them to discuss the shape of the distribution.

ANS:

3) A basketball player has the following points for seven games: 20, 25, 32, 18, 19, 22, and 30. Compute the following measures of variability.

a.

Standard deviation

b.

Coefficient of correlation

ANS:

a.

b.

4) The frequency distribution representing the number of frequent flier miles accumulated by employees at Brumley Statistical Consulting Company is listed below.

Lead Time (days)

Frequency

0 up to 5

6

5 up to 10

7

10 up to 15

12

15 up to 20

8

20 up to 25

7

Total

40

a) How many orders were filled in less than 10 days?

b) In less than 15 days?

c) About 60% of the orders were filled in less than how many days?

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