MGMT 650 MGMT650 FINAL EXAM ANSWERS (2020) - UMUC
MGMT 650 Final Exam Answers (2020) UMUC
1. For a confidence interval for a population parameter (e.g., the population mean) computed at a 90% confidence level, what proportion of all possible confidence intervals will contain the true parameter value? Enter answer with 2 decimal places.
2. With 80% confidence, for sample proportion 0.52 and sample size 30, what is the upper confidence limit with 2 decimal places?
3. What is the margin of error for the population mean at 90% confidence level for the information in DATA
4. With 90% confidence, for sample mean 353.00, sample standard deviation 13.70, and sample size 35, what is the upper confidence limit with 2 decimal places?
5. Bobo's Bad Burgers fast food claims you will be in and out in 5 minutes. To test this claim, time in minutes from entering Bobo's to receiving the order was secretly recorded. The results are documented in DATA. At a 95% confidence level, does the confidence interval support Bobo's claim?
6. Match up the following:
7. Match up the following:
8. Match the rules for rejecting H0 at the right to the following tests
9. Match problems to procedures.
10. Match problems to procedures.
11. An Air Quality instrument logs 0 when standards are not met and 1 when standards are met. The log is saved to file DATA. First, compute the proportion meeting standards as the mean of Air Quality values. Second, at alpha = 0.10 (sensitive, exploratory), test the hypothesis that proportion of times that air quality meets standards is at least 90%.
12. The Lawnpoke Golf Association (LGA) has established rules that manufacturers of golf equipment must meet for their products to be acceptable for LGA events. BatOutaHell Balls uses a proprietary process to produce balls with a mean distances of 295 yards. BatOutaHell is concerned that if the mean distance falls below 295 yards, the word will get out and sales will sag. Further, if the mean distance exceeds 295 yards, their balls may be rejected by LGA. Measurements of the distances are recorded in DATA. At α = 0.05, test the no action hypothesis that the balls have a mean distance of 295 yards.
13. The Fast N' Hot food chain wants to test if their "Buy One, Get One Free" program increases customer traffic enough to support the cost of the program. For each of 15 stores, one day is selected at random to record customer traffic with the program in effect, and one day is selected at random to record customer traffic with program not in effect. The results of the experiment are documented in DATA. For each store, compute difference = traffic with program minus traffic without program. At α = 0.05, test the hypothesis that the mean difference is at most 0 (at best the program makes no difference, or worse it decreases traffic) against the alternative that the mean difference > 0 (the program increases traffic).
14. BigDeal Real Estate surveyed prices per square foot in the valley and foothills of Hoke-a-mo, Utah. Based on BD's DATA, are prices per square foot equal at α = 0.01?
15. National Bearings manufactures bearings at plants located in Portland Oregon, Houston Texas, and Jacksonville Florida. To measure employee knowledge of Total Quality Management (TQM), six employees were randomly selected at each plant and tested. The test scores for these employees are given in DATA. Managers want to know if, on average, knowledge of TQM is equal across the 3plants. Test equality of mean scores at α = 0.05.
16. To test whether the mean time to mix a batch of adhesive is the same for machines produced by four manufacturers, TiteBondMax obtained DATA on the time (minutes) needed to mix the materials. Test whether the machines have equal mean mixing time at α =
17. To balance inventory at Otto's Optometry, customer Gender and Eye Condition were collected in DATA. Make a 2x2 pivot table with Gender in rows and Eye Condition in columns. The pivot table is
18. Given the following contingency table with category labels A, B, C, X, Y, and Z, what is the expected count with 1 decimal place in the joint category of C and X?
20. DATA contains Part Quality data of three Suppliers. At α = 0.05, does Part Quality depend on Supplier, or should the cheapest Supplier be chosen?
21. A sales region has been divided into five territories, each of which was believed to have equal sales potential. The actual Sales Volume for several sampled days is logged in DATA. At α = 0.05, do the territories have equal Sales Volume?
22. Scatter plots are used to discover relationships between variables. Using the corresponding measurements of variable1 and variable2 in DATA, plot variable1 vs. variable2 and describe the correlation between variable1 and variable2.
23. Correlation is used to discover relationships between variables. Evaluate the correlation between the variables in DATA. What is the correlation?
24. The equation of the regression line is Y = a + bX. Match the following symbols to the description to the right.
25. You are required to setup a predictive equation involving variable 1 and variable 2. First, you plot the DATA to determine if linear regression applies. You decide
26. An important application of regression in manufacturing is the estimation of cost of production. Based on DATA from Ajax Widgets relating cost (Y) to volume (X), what is the cost per widget?
27. An important application of regression in manufacturing is the estimation of cost of production. Based on DATA from Ajax Widgets relating cost (Y) to volume (X), what is the cost of producing 600 widgets?
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