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APU MATH 302 Quiz 5 - Latest IF You Want To Purchase A+ Work Then Click The Link Below , Instant Download http://www.hwspeed.com/APU-MATH-302-Quiz-5-Latest-45895894.htm? categoryId=-1
If You Face Any Problem E- Mail Us At JOHNMATE1122@Gmail.Com Question 1 of 17
1.0/ 1.0 Points
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means, . The sampling distribution of the sample mean difference, is:
A.approximately normal B.chi-squared distributed with 99 degrees of freedom C.t - distributed with 98 degrees of freedom D.normally distributed
Answer K Question 2 of 17
0.0/ 1.0 Points
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. Assume Îą = 0.05. What is the test value? Women Men Sample size 50 80 Mean effect 7 6.95 Sample variance 3 4
A.t = 0.151
B.z = 0.081 C.z = 0.455 D.t = 3.252
Feedback: This is a t-test of independent samples. To compue the test value t use: Question 3 of 17
1.0/ 1.0 Points
Which of the following statements is true regarding the F – distribution?
A.It is a distribution of negative values B.It is always skewed to the left C.It typically appears in tests of equal proportions D.none of the above
Part 2 of 8 -
3.0/ 5.0 Points
Question 4 of 17
1.0/ 1.0 Points
The correlation value ranges from
A.-3 to +3 B.–1 to +1 C.0 to +1 D.–2 to +2
Answe Question 5 of 17
1.0/ 1.0 Points
Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheet Apartments in the Excel workbook Apartments.xlsx. Using that data, find the estimated regression equation which can be used to estimate the monthly rent for apartments in this neighborhood using size as the predictor variable. Apartments.xlsx
A.
177.12 + 1.065(size)
B.1.065 + 177.12(size) C.177.12 + 0.8500(size) D.197.12 + 2.065(size)
Question 6 of 17
0.0/ 1.0 Points
If an estimated regression line has a Y-intercept of –7.5 and a slope of 2.5, then when X = 3, the actual value of Y is:
A.5 B.10 C.0 D.unknown
Answer Question 7 of 17
0.0/ 1.0 Points
A Question 8 of 17 Part 3 of 8 -
1.0/ 1.0 Points 0.0/ 2.0 Points
Question 9 of 17
0.0/ 2.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. A field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain area. The following are the results of his random sampling. Can he conclude, at the 0.10 level of significance, that the average trunk diameter of a pine tree is greater than the average diameter of a spruce
tree? Sample size Mean trunk diameter (cm) Sample variance
Pine trees 30
Spruce trees 35
45
39
120
140
What is the test value for this hypothesis test? Test value: 2.474 Round your answer to three decimal places. What is the critical value? Critical value: 1.296 Round your answer to three decimal places.
Feedback: This is a t-test of independent samples. Use the formula for the t test value on page 480: Using Table F (df = 29, alpha = 0.10, one-tail test) the critical t-value is 1.311. Part 4 of 8 -
2.0/ 2.0 Points
Question 10 of 17
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. Data for a sample of 25 apartments in a particular neighborhood are provided in the worksheet Apartments in the Excel workbook Apartments.xlsx. Using the estimated regression equation found by using size as the predictor variable, find a point estimate for the average monthly rent for apartments having 1,000 square feet of space. Place your answer, rounded to the nearest whole dollar, in the blank. 1242 When entering your answer do not use any labels or symbols. Simply provide the numerical value. For example, 123 would be a legitimate entry. Apartments.xlsx
Question 11 of 17
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. A company has observed that there is a linear relationship between indirect labor expense (ILE) , in dollars, and direct labor hours (DLH). Data for direct labor hours and indirect labor expense for 18 months are given in the file ILE_and_DLH.xlsx Treating ILE as the response variable, use regression to fit a straight line to all 18 data points. Using your estimated regression output, predict the indirect labor expenses for a month in which the company has 31 direct labor hours. Place your answer, rounded to 1 decimal place, in the blank. Do not use any stray punctuation marks or a dollar sign. For example, 458.9 would be a legitimate entry. 525.4 A Part 5 of 8 -
0.0/ 2.0 Points
Question 12 of 17
0.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at the annual company percentage increase in revenue versus the CEO's annual percentage salary increase in that same company. Suppose that a random sample of companies
yielded the following data: percent change for corporation percent change for CEO
15 12 3 12 28 6 8 2 6 17 -4 12 32 -1 7 2
Do these data indicate that the population mean percentage increase in corporate revenue is greater than the population mean percentage increase in CEO salary? Use a 5% level of significance. What is the test value that you would use to conduct this test of hypothesis? Place your answer, rounded to 3 decimal places, in the blank. For example, 2.345 would be a legitimate entry. 0.357
Question 13 of 17
0.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. Are America's top chief executive officers (CEOs) really worth all that money? One way to answer this question is to look at the annual company percentage increase in revenue versus the CEO's annual percentage salary increase in that same company. Suppose that a random sample of companies yielded the following data: percent change for corporation 15 12 3 12 28 6 8 2 percent change for CEO 6 17 -4 12 32 -1 7 2
Do these data indicate that the population mean percentage increase in corporate revenue is greater than the population mean percentage increase in CEO salary? Use a 5% level of significance. What is the critical value that you would use to conduct this test of hypothesis? Place your answer, rounded to 3 decimal places, in the blank. For example, 2.345 would be a legitimate entry. 1.773 Part 6 of 8 1.0/ 3.0 Points Question 14 of 17
1.0/ 3.0 Points
Accepted characters: numbers, decimal point markers (period
or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. A professor gives an exam for which there are two versions, A and B. Each student in the class is given one randomly selected version of the exam. After the exam, the professor wishes to determine if there is a difference in the level of difficulty of the two versions by determining if there is a significant difference in the mean scores. Assume Îą = 0.05. Version A Version B Sample size 45 65 Mean score 8.8 8.2 Sample variance 2.6 2.4 What is the test value for this hypothesis test? Answer: 1.23 Round your answer to two decimal places. What is/are the critical value(s) for this hypothesis test? If there are two critical values, give only the positive value. Answer: 1.96 Round your answer to two decimal places. What is the conclusion for this hypothesis test? Choose one. 1. There is not sufficient evidence to show that one version of the exam is more difficult than the other. 2. There is sufficient evidence to show that one version of the exam is more difficult than the other. Answer: Feedback: This is a t-test of independent samples. Use the formula on page 480 to compute the test value t: Note that the variance is given, not the standard deviation. This is a two-tail test with alpha = 0.05, df = 44 (using the smaller sample size) critical value is found using the Critical Values workbook to be Âą2.0154. Because the test value falls in the noncritical region, there is NOT sufficient evidence to show that one version is more difficult than the other at the 0.05 level of significance. Part 7 of 8 -
1.0/ 1.0 Points
Question 15 of 17
1.0/ 1.0 Points
In conducting hypothesis testing for difference between two means when samples are dependent (paired samples), the
variable under consideration is ; the sample mean difference between the pairs.
True False
Part 8 of 8 -
2.0/ 2.0 Points
Question 16 of 17
1.0/ 1.0 Points
In a simple regression analysis, if the standard error of estimate sest = 15 and the number of observations n = 10, then the sum of the residuals squared must be 120.
True False
Answer Key:
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