QUESTION 1

A sample of 30 randomly selected salaries for college football coaches was collected for analysis. The sample is below.

Calculate the following statistics. Please round your answer to the nearest whole number.

- Mean Salary

- Median

-. Range

d. Standard Deviation

Choose one 10 points

Image description:

A table with 1 column. The column has a header of "Salaries" with the following numbers:

461533,

399846,

489798,

223162,

455140,

414180,

256759,

174885,

206976,

492193,

394199,

182321,

64583,

107752,

254699,

473719,

60241,

403344,

195807,

407854,

339083,

185137,

134880,

211947,

281876,

230543,

45815,

310563,

293370,

and 224704.

a)

Mean: 279,200

Median: 255,700

Range: 446,400

Standard deviation: 135,000

b)

Mean: 280,000

Median: 260,000

Range: 400,000

Standard deviation: 100,000

c)

Mean: 279,000

Median: 255,000

Range: 446,000

Standard deviation: 135,000

d)

Mean: 279,230

Median: 255,729

Range: 446,378

Standard deviation: 135,007

QUESTION 2

An investing firm wants to diversify their portfolio and is considering purchasing stock in a recording company. For the past 4 months, the company has experienced increases in its revenue growth rate as follows: 1.5%, 2.3%, 1.7% and -1.3%. What is the average rate of revenue growth? Round your answer to four decimals.

Choose one 10 points

a) 0.0104

b) 0.0105

c) 0.0103

d) 0.0106

QUESTION 3

The mean is a number equal to:

Choose one 10 points

a) The sum of all probabilities divided by the number of options

b) The sum of all the data values divided by the number of data values

c) The square root of the variance

d) The sum of all the standard deviations divided by the number of data values

QUESTION 4

A college student took 4 courses last semester. His final grades, along with the credits each class is worth, are as follow: A (4), B (3), F (3), A (2) and D (1). The grading system assigns quality points as follows: A: 4; B: 3; C: 2; D: 1; and F: 0. Find the student's GPA for this semester. Round your answer to the nearest thousandth (three decimals).

Choose one 10 points

a) 2.845 GPA

b) 3.010 GPA

c) 2.615 GPA

d) 3.100 GPA

QUESTION 5

A sample:

Choose one 10 points

a) Has to be very small.

b) The one of many ways to obtain reliable data about a population.

c) It is represented by Latin (Roman) letters.

d) It is not a subset of the population.

QUESTION 6

We collected a sample of the prices of new homes. The mean of our sample is $255,000, with a standard deviation of $19,000. Calculate the z-scores of each of the given prices. Determine if the they are usual or unusual. Round up each z-score to two decimals.

(a) $275, 000

(b) $230,000

(c) $210,000

(d) $290,000

Choose one 10 points

• -1.05, unusual
• 1.23, unusual
• 2.37, usual
• -1.84, unusual

• 1.05, usual
• -1.32, usual
• -2.37, unusual
• 1.84, usual

• 1.05, usual
• -1.23, usual
• -2.37, usual
• 1.84, usual

• -1.05, usual
• -1.23, usual
• -2.37, unusual
• 1.84, usual

QUESTION 7

Statistics Endeavors to:

Choose one 10 points

a) Determine trends

b) Make correlations

c) Make forecasts

d All of the above

QUESTION 8

A family moved to Orlando, FL and bought a home. They paid $254,876 for their house. In their neighborhood the mean price of a home is $267,985 with a standard deviation of $5,834. Calculate thez-scorefor the price of their home and indicate if the price they paid for their homeusualorunusual.

Choose one 10 points

a) The z-score is 2.247 and it is usual.

b) The z-score is -2.247 and it is unusual.

c) The z-score is 2.247 and it is unusual.

d) The z-score is -2.247 and it is usual

QUESTION 9

Descriptive statistics include:

Choose one 10 points

a) Measurements of central tendency

b) Measurements of dispersion

c) Both of the above

d) None of the above

QUESTION 10

Measurements for entire populations are:

Choose one 10 points

a) Very easy to calculate

b) Always done with big computers

c) For the most part, very impractical

d) The only way to obtain reliable data