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APUS Math302 quiz 4

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Question;Question 1 of 171.0 PointsMultiple myeloma or blood plasma cancer is characterized by increased blood vessel formulation in the bone marrow that is a prognostic factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient?s own stem cells. The following data represent the bone marrow microvessel density for a sample of 7 patients who had a complete response to a stem cell transplant as measured by blood and urine tests. Two measurements were taken: the first immediately prior to the stem cell transplant, and the second at the time of the complete response.Patient1234567Before158189202353416426441After284214101227290176290At the.01 level of significance, is there sufficient evidence to conclude that the mean bone marrow microvessel density is higher before the stem cell transplant than after the stem cell transplant?A.NoB.YesC.Cannot DetermineReset SelectionQuestion 2 of 171.0 PointsMultiple myeloma or blood plasma cancer is characterized by increased blood vessel formulation in the bone marrow that is a prognostic factor in survival. One treatment approach used for multiple myeloma is stem cell transplantation with the patient?s own stem cells. The following data represent the bone marrow microvessel density for a sample of 7 patients who had a complete response to a stem cell transplant as measured by blood and urine tests. Two measurements were taken: the first immediately prior to the stem cell transplant, and the second at the time of the complete response.Patient1234567Before158189202353416426441After284214101227290176290Perform an appropriate test of hypothesis to determine if there is evidence, at the.05 level of significance, to support the claim that the mean bone marrow microvessel density is higher before the stem cell transplant than after the stem cell transplant? What is the value of the sample test statistic?A.p = 2.7234B.t = 2.7234C.z = 1.8424D.t = 1.8424Reset SelectionQuestion 3 of 171.0 PointsMembers of the general adult population volunteer an average of 4.2 hours per week. A random sample of 20 female college students and 18 male college students produced the results given in the table below. At the.01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students?FemalesMalesSample size2018Sample mean3.82.5Sample variance3.52.2A.No, because the test value 2.38 is greater than the critical valueB.No, because the test value 2.38 does not exceed the critical valueC.No, because the test value 2.90 is greater than the critical valueD.Yes, because the test value 2.90 is greater than the critical valueReset SelectionPart 2 of 8 -Question 4 of 171.0 PointsIf 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.0B.10C.5D.unknownReset SelectionQuestion 5 of 171.0 PointsThe marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 12 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars..Store123456Shelf Space555101010Weekly Sales1.62.21.41.92.42.6Store789101112Shelf Space151515202020Weekly Sales2.32.72.82.62.93.1Is the correlation between weekly sales and shelf space significant at the.01 level of significance?A.No, the sample correlation coefficient does not exceed the critical value.B.Yes, the computed t-test statistic is less than the critical value.C.Yes, the p-value of the test for significance is less than.01.D.Yes, the value of the test statistic does not exceed the critical value.Reset SelectionQuestion 6 of 171.0 PointsIn a simple linear regression analysis, the following sum of squares are produced:f$sum{(y-ar{y})^{2}}f$ = 500f$sum{(y-y')^{2}}f$ = 100f$sum{(y'-ar{y})^{2}}f$ = 400The proportion of the variation in Y that is explained by the variation in X is:A.80%B.50%C.20%D.25%Reset SelectionQuestion 7 of 171.0 PointsThe regression line y' = -3 + 2.5 X has been fitted to the data points (28, 60), (20, 50), (10, 18), and (25, 55). The sum of the squared residuals will be:A.49.00B.20.25C.16.00D.94.25Reset SelectionQuestion 8 of 171.0 PointsCorrelation is a summary measure that indicates:A.the magnitude of difference between two variablesB.a curved relationship among the variablesC.the strength of the linear relationship between pairs of variablesD.the rate of change in Y for a one unit change in XReset SelectionPart 3 of 8 -Question 9 of 172.0 PointsAccepted 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?Pine treesSpruce treesSample size3035Mean trunk diameter (cm)4539Sample variance120140What is the test value for this hypothesis test?Test value: Round your answer to three decimal places.What is the critical value?Critical value: Round your answer to three decimal places.Part 4 of 8 -Question 10 of 171.0 PointsAccepted 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.The marketing manager of a large supermarket chain would like to determine the effect of shelf space (in feet) on the weekly sales of international food (in hundreds of dollars). A random sample of 12 equal ?sized stores is selected, with the following results:Store Shelf Space(X) Weekly Sales(Y)1 10 2.02 10 2.63 10 1.84 15 2.35 15 2.86 15 3.07 20 2.78 20 3.19 20 3.210 25 3.011 25 3.312 25 3.5Find the equation of the regression line for these data. What is the value of the coefficient of determination? Place your answer, rounded to 3 decimal places, in the blank. Do not use a dollar sign. For example, 0.345 would be a legitimate entry.Question 11 of 171.0 PointsAccepted 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.xlsxTreating 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.Part 5 of 8 -Question 12 of 171.0 PointsAccepted 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.Q-Mart is interested in comparing its male and female customers. Q-Mart would like to know if the amount of money spent by its female charge customers differs, on average, from the amount spent by its male charge customers. To answer this question, an analyst collected random samples of 25 female customers and 22 male customers.Based on these samples, on average, the 25 women charge customers spent $102.23 and the 22 men charge customers spent $86.46. Moreover, the sample standard deviation of the amount charged by the 25 women was $93.393, and the sample standard deviation of the amount charged by the 22 men was $59.695.Suppose, using a 10% level of significance, you wish to know if there is sufficient evidence for Q-Mart to conclude that, on average, the amount spent by women charge customers differs from the amount spent by men charge customers. That is suppose you wish to testH0: f$mu _{W} = mu _{M}f$ versus H1: f$mu _{W} eq mu _{M}f$Assuming that the amounts spent by male and female charge customers at Q-Mart are normally distributed, based on the procedure advocated by Bluman, 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, 0.123 would be a legitimate entry.Question 13 of 171.0 PointsAccepted 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 2percent change for CEO 6 17 -4 12 32 -1 7 2Do 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 p-value associated with this test of hypothesis? Place your answer, rounded to 3 decimal places, in the blank. For example, 0.134 would be a legitimate entry.Part 6 of 8 -Question 14 of 173.0 PointsAccepted 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.Researchers conducted an experiment to measure the effect of a drug on improving the quality of sleep as determined by how many more minutes of REM sleep were measured for each participant. One group of participants were given the experimental drug, the other (control) group was given a placebo. Does the evidence indicate that the drug improved the amount of REM sleep at a 0.01 level of significance? Answer each of the following parts.Experimental group Control groupsample size 35 50mean sleep improvement 12.8 9.1sample variance 56.3 61.2What is the test value for this hypothesis test?Answer: Round your answer to two decimal places.What is the P-value for this hypothesis test?Answer: Round your answer to three decimal places.What is the conclusion of this hypothesis test? Choose one.1. There is sufficient evidence to show that the experimental drug improved the quality of sleep.2. There is not sufficient evidence to show that the experimental drug improved the quality of sleep.3. There is sufficient evidence to show that the quality of sleep is different for the experimental drug than for the control drug.4. There is not sufficient evidence to show that the control drug decreased the quality of sleep.Answer: Enter only a 1, 2, 3 or 4 for your answer.Part 7 of 8 -Question 15 of 171.0 PointsWhen testing the equality of two population variances, the test statistic is the ratio of the population variances, namely f$frac{sigma _{1}^{2}}{sigma _{2}^2}f$.TrueFalseReset SelectionPart 8 of 8 -Question 16 of 171.0 PointsIf there is no linear relationship between two variables X and Y, the coefficient of determination, R2, must be f$pm f$ 1.0.TrueFalseReset SelectionQuestion 17 of 171.0 PointsIn simple linear regression analysis, the relationship between the response variable Y and the explanatory variable X is a straight line. This means that all data points lie on the line.TrueFalse

 

Paper#60521 | Written in 18-Jul-2015

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