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1. The owner of a ?eet of taxi cabs wants to determine if there is a difference in the lifetime of two different brands of car batteries used in the ?eet of cabs. State the appropriate null and alternative hypotheses.
2. The safety coordinator of a manufacturing facility wishes to demonstrate that the mean time (in days) between safety incidents has deteriorated from the traditional 30 days. What are the appropriate null and alternative hypotheses?
Report the test statistic and p-value. What is your decision and conclusion? State any assumptions you have made. Are these assumptions satisfied with these data?
when do creative people get good ideas? assume that the survery of 965 inventors give the following informationtime of
1. A city sewer maintenance crew maintained an average of 248 sewer lines per day two years ago. Upon providing more efficient equipment, a sample of 64 sewer-work days shows that a mean of 260 sewer lines were maintained, with a standard dev..
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
Men are usually the snow blower accident victims. There are several factors to consider, but we're going to choose the level of operating experience between men ages 21-35.
question to play a lottery game a player must choose 6 numbers between 1 and 49. the order is not important. six
1nbsp show that for a continuousft ht1o tgt0 is a constant i.e. not dependent on t if and only if t follows an
A retailer finds that the demand for a very popular board game averages 100 per week with a standard deviation of 20. If the seller wishes to have adequate stock 95% of the time.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Jars have exactly the same number of red, orange, yellow, green, blue, and violet jelly beans. What is the maximum number of jars the factory can produce?
the corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan.
Find the 98% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 10 peaches per tree?
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