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Question: The Hughes Supply Company uses an inventory management method to determine the monthly demands for various products. The demand values for the last 12months of each product have been recorded and are available for future forecast-ing. The demand values for the 12 months of 2006 for one electrical fixture are presented in Table below. Use exponential smoothing with a smoothing constant of .5 and an initial value of 205 to forecast the demand for January 2007.
Month DemandJan-06 205Feb-06 251Mar-06 304Apr-06 284May-06 352Jun-06 300Jul-06 241Aug-06 284Sep-06 312Oct-06 289Nov-06 385Dec-06 256
Use the .05 level. (a) Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to (a) and (b) to someone who has never had a course in statistics.
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
Prepare a 1,050- to 1,750-word paper describing the results of a hypothesis test of one population mean or population proportion.
You do not need to collect data and actually conduct the test calculations. Rather,state the claim, define the null and alternate hypotheses, identify the test significance and the test statistic, and state the decision rule that will be used.
Find the test statistic, p-value and critical value and state a final conclusion. Sample data: n=40, mean of the values in a sample = 117, assume that the standard deviation = 14 and the significance level = 0.05
Commute times: three random samples of time in minutes that commuters are stuck in traffic are shown. At anova =0.05, is there a difference in the mean times among the three cities?
The results, in tons of force required for breakage, are as follows: Determine the mean, median, range, and midrange. Calculate the mean absolute deviation (MAD).
Let random variable X represent number of heads on first toss and y total number of heads from three tosses. Sketch tree view with X as first level and Y/X as second level and determine conditional probability p(Y=2/X=1).
A medical supplies company buys its supplies in bulk and redistributes them to doctor's offices and clinics. The receive thermometers in lots of 500 from the vendor. They are considering a sampling plan of n=50 and c=1.
In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents
In ANOVA, what does F=1 mean? What are the differences between a two sample t-test and ANOVA hypothesis testing?
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
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