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Last week's sales of iMac computers at an Apple Store in Oklahoma City, OK, are shown in the following table:
Day
Sales (Dollars)
1
180
2
150
3
210
4
225
5
195
6
190
7
230
(a) Use the 3-day moving average method for forecasting days 4-7.
(b) Use the 3-day weighted moving average method for forecasting days 4-7. Use Weight 1 day ago = 2, Weight 2 days ago = 4, and Weight 3 days ago = 3.
(c) Compare the techniques using the mean absolute deviation (MAD).
With the sample standard deviation of 12 lbs. Determine the 90% confidence interval of true mean weight of all college wrestlers.
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1. a bus starts with eight people 2 of which are jack and diana and stops at 12 locations. assuming nobody else gets on
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
a bag contains 6 green marbles 10 blue marbles and 4 yellow marbles. what is the chance of drawing a green marble? if a
Compute the following .r = correlation between x and y = - 0.7 = mean of the values of x = 50.25 = mean of the values of y = 31.77 = standard deviation of the values of x = 15.85 = standard deviation of the values of y = 1.76 The slope of the leas..
Show that Q3 is an unbiased estimator for q and if Q1 and Q2 are independent, how should the constant a be chosen in order to minimize the variance of Q3?
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suppose you flip a fair coin 500 times. what is the standard error for the number of heads you
Bell-shaped with a mean of $45, 000 and a standard deviation of $3, 500. What percentage of teachers earn anywhere from $38, 000 to $48, 500?
The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
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