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For the Hawkins Company, the monthly percentages of all shipments received on time over the past 12 months are 80, 82, 84, 83, 83, 84, 85, 84, 82, 83, 84, and 83.
a) Construct a time series plot. What type of pattern exists in the data?
b) Compare a three-month moving average forecast with an exponential smoothing fore-cast for a = 0.2. Which provides the better forecasts using MSE as the measure of model accuracy?
c) What is the forecast for next month?
Calculate probability that the sample would have a mean:
Can we conclude a difference in voting patterns for men vs. women? YES or NO (circle one)
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
After 1,000-trial simulation, examine statistical information generated and compare output of simulation with your findings in Problem .Briefly describe the significant similarities and differences.
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
Draw a tree diagram representing the data. What is the probability that a vehicle stolen in this city will never be recovered?
We recalculated our comparison of ideal number of children, this time only for women, separating them into two groups, those who indicated that they were "very happy" or "not at all happy" with life.
Calculate table T t . Calculate Computed T c .
A certain firm specializing in the manufacture and sale of free time clothing has 80 retail stores in Florida and 140 in California. With each state as a stratum, the firm wishes to estimate average sick-leave time per employee for the past year
With a single-sample t ratio, the null hypothesis states that:
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