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Is there a significant difference in the gasoline mileage of a car for regular unleaded and premium unleaded? To test this question, a researcher randomly selected 15 drivers for a study. They were to drive their cars for one month on regular unleaded and for one month on premium unleaded gasoline. The participants drove their own cars for this experiment. The average sample difference was 2.85 miles per gallon in favor of the premium unleaded, and the sample standard deviation of difference was 1.9 miles per gallon. For proportional to = .01 , does the test show enough evidence for the researcher to conclude that there is a significant difference in mileage between regular unleaded and premium unleaded gasoline? Assume the differences in gasoline mileage figures are normally distributed in the population. In addition, include the appropriate confidence interval(CI) and include the proper interpretation for estimating the difference of these population means, in the order of premium MPG MINUS Regular MPG.
Particular brand that they buy. A retailer has ordered a consignment of 5000 such lamps for its chain store nationwide. What is the probability that, the number of defective lamps will be 500 or less?
If the researcher used an independent-measures design, then how many individuals were needed for the study and what are the df values for the F ratio?
Determine the critical values, or cutoffs, assuming a two-tailed test with a p level of 0.05, for each of the designs described in given Exercise.
Cathy and Jen plan to meet at a cafe, and each will arrive at the cafe at a random time between 11:00 AM and 11:30 AM, independently of each other. Find the probability that the first to arrive has to wait between five and ten minutes for the othe..
You are asked to match three songs with the performers who made those songs famous. if you guess, the probability distribution for the number of correct matches is:
Which of the following assumptions is not made for the F-test for comparing three or more means?
But then I struggle with the math to then get the standard deviation value correct. mean-k(sd)=LL doesn't seem to help me here.
The unemployment rate in a city is 14%. If 10 people from the city are sampled at random, find the probability that more than 1 of them is unemployed.
Give a formula for the probability law of the numerical valued random phenomenon described.
Revealing information. 886 randomly sampled teens were asked which of several personal items of information they thought it okay to share with someone.
Using a spreadsheet, create a table that shows the relationship among the units of heights of people in centimeters, inches and feet in the range of 150cm to 2m. Use increments of 5cm.
Show that the family of beta distributions is a conjugate family of prior distributions for samples from a negative binomial distribution
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