BUSA320 Statistics: file1 study review and file2. exam review

BUSA320 : Statistics for Decision-Making

Textbook : BSTAT 2^nd 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?