Question 8: The salaries of employees of the Moe D. Lawn Landscaping Company are below

What are the mean, median, and mode? Round each answer to two decimal places if needed.

Salary

22,000

23,000

26,000

49,000

Frequency

6

2

1

2

Question 9: The salaries of employees of the Moe D. Lawn Landscaping Company are below

What are the mean, median, and mode? Round each answer to two decimal places if needed.

Salary

21,000

22,000

29,000

33,000

Frequency

6

3

2

3

Question 10: 10,000 respondents were asked the following question.

“If the election for U.S. Senate were being held today, for whom would you vote?”

Use the bar graph below to answer the questions that follow.

PICTURE OF GRAPH: http://i38.tinypic.com/qn0mcj.jpg

What percent of the voters favored Jones in January?

Question 11: what is the definition of statistics?

Question 12: Quartiles, percentage rank, and decile rank are termed:

Question 13: In statistics, the term dispersion means:

Question 14: In statistics, the term that describes the total set of items defined by some characteristics is called the:

Question 15 The purchasing power of the dollar (1967=$1) is (to the nearest cent):

1970, $0.86; 1972, $0.80; 1974, $0.68; 1976, $0.59; 1978, $0.49

Draw a line graph representing this data.

PICTURE OF GRAPH:

Question 16: The height of 20 students are as follows (rounded to the nearest inch):

66, 68, 65, 65, 67, 67, 66, 66, 69, 65, 68, 67, 67, 65, 69, 65, 67, 66, 69, 69

Prepare a frequency distribution for this data. Then, enter the number of data points in each category below.

Question 17: Match each definition below with the letter of the corresponding term.

a. histogram

b. circle graph or pie chart

c. frequency distribution

____ 18. An association of data values with a frequency indicating the number of measurements in some set of intervals.

____ 19. Graph representing a frequency distribution using horizontal or vertical bars uniform width

____20. Circular graph divided into sectors with areas proportional to the quantities represented.

Question 21: The following line graph shows the expenses for two salespeople of the Lead well Pencil company.

PICTURE OF GRAPH: http://i33.tinypic.com/2dbuy5z.jpg

Which salesperson has more variability in his or her expenses? Explain why:

Question 22: PICTURE OF GRAPH: http://i38.tinypic.com/20ft34w.jpg

A. What is the frequency of people “failing” the course?

B. What percentage of students received a B in the class?

C. How many students are in this class?

Question 23: Mary received the following test scores in her math class” 90, 85, 67, 80, 83

Calculate the variance in her test scores? Also show how to solve the standard deviation by expressing the formula necessary to arrive at a solution. Assume the variance is for the population.

The population variance is:__________

The standard deviation is:____________

Question 24: Joe received the following test scores in her math class: 92, 85, 65, 89, 96, and 71. Calculate the variance in his test scores. Also show how to solve the standard deviation by expressing the formula necessary to arrive at a solution. Assume the variance is for the population.

The variance of the population is:______________

Show by fomula how to calculate the standard deviation:__________

Question 25: Compare who scored higher—Joe or Terry— in comparison to their classmates.

Joe received a 65 on the examination and the mean score on the exam was 50, the standard deviation was 15.

Terry scored 74 on the examination for which the mean score was 80 and the standard deviation was 3.

Who did better in comparison to their class? Answer Joe or Terry. Discuss how you would answer this question using your understanding of the mean and the standard deviation. Show all work.

Question 26: Calculate the mean, population variance, and standard deviation for the following test scores that Jimmy received: 90, 80, 70, 60. In calculating the standard deviation, show the method of calculation. You do not have to calculate the exact number.

The mean is:________

The population variance is:________

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