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Question 25 of 25

Provide an appropriate response.

The table contains the weights (in pounds) and heights (in inches) of 9 randomly selected adults. Estimate or compute the correlation coefficient.

A. -0.54 B. -0.73 C. 0.54 D. 0.73 Reset Selection

Question 12 of 25

1.0 Points Select the best-fit line for the data on the scatter diagram. If none of the lines fit the data, write "none of the lines".

Select the best-fit line on the scatter diagram below.
A. B B. A C. C D. none of the lines Reset Selection

Question 13 of 25

1.0 Points Solve the problem. Round your answers to the nearest whole percent.



The scatter diagram shows the data for the prices of a stock (y) and U.S. employment (x). The correlation coefficient r is 0.8. Determine how much of the variation in the stock price can be accounted for by the best-fit line. A. 36% B. 80% C. 20% D. 64% Reset Selection

Question 14 of 25

1.0 Points Solve the problem.

An industrial psychologist is investigating the effects of work environment on employee attitudes. A group of 20 recently hired sales trainees were randomly assigned to one of four different "home rooms" - five trainees per room. Each room is identical except for wall color. The four colors used were light green, light blue, gray and red. The psychologist wants to know whether room color has an effect on attitude, and, if so, wants to compare the mean attitudes of the trainees assigned to the four room colors. At the end of the training program, the attitude of each trainee was measured on a 60-point scale (the lower the score, the poorer the attitude). Give the null hypothesis. A. The four rooms with different colors do not all have the same mean attitude score. B. The four rooms with different colors have the same mean attitude score. C. The five trainees in one room have the same mean attitude score as the five in a different room. D. The 20 sales trainees have the same attitude score. Reset Selection

Question 15 of 25

1.0 Points Solve the problem.

Four different leadership styles (A, B, C, and D) used by Big-Six accountants were investigated. As part of a designed study, 15 accountants were randomly selected from each of the four leadership style groups (a total of 60 accountants). Each accountant was asked to rate the degree to which their subordinates performed substandard field work on a 10-point scale -- called the "substandard work scale". The objective is to compare the mean substandard work scales of the four leadership styles. The data on substandard work scales for all 60 observations were subjected to an analysis of variance.

ONE-WAY ANOVA FOR SUBSTAND BY STYLE



Is there sufficient evidence to support the claim that the means of the four leadership style groups are not all the same? Assume that a 0.05 significance level is used. A. Yes B. No Reset Selection

Question 16 of 25

1.0 Points Identify the following variable as either qualitative or quantitative and explain why.

The number of people on a jury A. Quantitative because it consists of a count B. Qualitative because it is not a measurement or a count Reset Selection

Question 17 of 25

1.0 Points Identify the following variable as either qualitative or quantitative and explain why.

A person's height in feet A. Qualitative because it is not a measurement or a count B. Quantitative because it consists of a measurement Reset Selection

Question 18 of 25

1.0 Points State whether the actual data are discrete or continuous and explain why.

The freshman class sizes at mid western colleges in a given year A. Continuous because the numbers can have any value within some range of values B. Discrete because only counting numbers are used, and no values between the counting numbers are possible Reset Selection

Question 19 of 25

1.0 Points State whether the actual data are discrete or continuous and explain why.

The count of cars passing a certain intersection for each day of the week A. Continuous because the numbers can have any value within some range of values B. Discrete because only counting numbers are used, and no values between the counting numbers are possible Reset Selection

Question 20 of 25

1.0 Points Perform the requested conversion.

Convert -0.51 to a percent. A. -0.0051% B. 0.51% C. -51% D. -5.1% Reset Selection

Question 21 of 25

1.0 Points Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations.

Frank's Furniture employees earned $487.05, $281.74, , , and last week. Find the mean wage of the employees rounded to the nearest cent. A. $390.00 B. $502.50 C. $402.00 D. $335.00 Reset Selection

Question 22 of 25

1.0 Points Find the median for the given sample data.

5, 6, 12, 21, 30, 30, 49 A. 21 B. 30 C. 12 D. 25.5 Reset Selection

Question 23 of 25

1.0 Points Find the standard deviation for the given data. Round your answer to one more decimal place than the original data.

The numbers below represent the test scores of nine students.
61,  79,  35,  54,  85,  55,  56,  83,  77 A. 15.9 B. 8.1 C. 18.1 D. 16.9 Reset Selection

Question 24 of 25

1.0 Points Solve the problem.

You obtain the multiple regression equation = 2 + 6x1 - 8x2 from a set of sample data. Interpret the slope coefficients for x1 and x2. A. The slope coefficient of x1 is 6. This indicates that will increase 6 units, on average, for every 1-unit increase in x1, provided that x2 remains constant. The slope coefficient of x2 is -8. This indicates that will decrease 8 units, on average, for every 1-unit increase in x2, provided that x1 remains constant. B. The slope coefficient of x1 is -8. This indicates that will decrease 8 units, on average, for every 1-unit increase in x1, provided that x2 remains constant. The slope coefficient of x2 is 6. This indicates that will increase 6 units, on average, for every 1-unit increase in x2, provided that x1 remains constant. C. The slope coefficient of x1 is -6. This indicates that will decrease 6 units, on average, for every 1-unit increase in x1, provided that x2 remains constant. The slope coefficient of x2 is 8. This indicates that will increase 8 units, on average, for every 1-unit increase in x2, provided that x1 remains constant. D. The slope coefficient of x1 is 8. This indicates that will increase 8 units, on average, for every 1-unit increase in x1, provided that x2 remains constant. The slope coefficient of x2 is -6. This indicates that will decrease 6 units, on average, for every 1-unit increase in x2, provided that x1 remains constant. Reset Selection

Question 25 of 25

1.0 Points A fund manager wants to know if it is equally likely that the Dow Jones Industrial Average will go up each day of the week. For each day of the week, the fund manager observes the following number of days when the Dow Jones Industrial Average goes up.
Day of the Week Observed Monday 192 Tuesday 189 Wednesday 202 Thursday 199 Friday 218 Which of the following is the observed value of goodness-of-fit chi-square test statistic? A. 2.57 B. 0.605 C. 0.632 D. 1.62

Explanation / Answer

(14)

B. The four rooms with different colors have the same mean attitude score

(16)

A. Quantitative because it consists of a count

(17)

B. Quantitative because it consists of a measurement

(18)

B. Discrete because only counting numbers are used, and no values between the counting numbers are possible

(19)

B. Discrete because only counting numbers are used, and no values between the counting numbers are possible

(20)

C. -51% , because the % value is obtained by simply multiplying the decimal value by 100

(22)

A. 21, because it is the middle value when the data is arranged in a particular order (ascending or descending)

(23)

D. 16.9

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