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Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
Describe some common forecasting approaches for judgmental forecasting.
List and define the three principal ways of measuring forecast accuracy. What are the key differences among them?
Explain the differences between moving average and exponential smoothing models.
What is the difference between variables and attributes?
Describe the meaning of the term "in control."
Describe the steps involved in applying statistical process control.
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level, can we conclude the population mean is less than 20 for all accidents?
Use this information to construct a probability table, and then calculate each of the following probabilities:
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Evaluate the multiple regression model between quantity sold (Y) and following explanatory variables: average price of deep-dish pizzas, monthly advertising expenditures, and disposable income per household in areas surrounding outlets.
Would you use a one-tailed or two-tailed test? Explain your response.
Apply the EOQ model to the following quantity discount situation in which D=500 units per year, C0=$40, and the annual holding cost rate is 20%. What order quantity do you recommend?
Determine future value of annuity due which has $750 deposited at the starting of each month for 15 years at 5.9% compounded monthly.
Report a table of marginal means for each level of each of the three factors.
Would the null hypothesis that the 2007 median household income was $50,000 be rejected at the 10% significance level in favor of the two-sided alternative? (Choose the correct answer)
Use population distribution to determine expected juror frequencies. Test researcher's claim at a = 0.01.
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