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In establishing warranty on TV sets the manufacturer wants to set the limits so that few will need repair at manufacturer expense. On the other hand, the warranty period must be long enough to make the purchase attractive to the buyer. For a new TV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months. Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
Determine the probability of randomly selecting a person graduating with Master's degree who didn't major in Education.
Make use of Excel to determine the right-tail p-value.
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
Do the association between the sizes of the heads and bodies of the two species appear to be strong? Explain.
Based on information, compute the following: Percentage (or portion) of children who watch television less than 6.5 hours a week.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
Random sample of 64 services is selected. Assume the population consists of 400 services. Find out the standard error of mean.
Write introduction to SPC (STATISTICAL PROCESS CONTROL)? Describe the use of SPC tools used at D2D?
Calculate the mean, median and mode for both sets and do graph/histogram to chart the results and conclude if indeed one set of year had more the other as far a snowfall.
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