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Studies show that gasoline use for compact cars sold in the United States is normally distributed, with a mean of 36.5 miles per gallon (mpg) and a standard deviation of 5.5 mpg. What percentage of compacts get 35 mpg or more? (Mendenhall et al., 2015)
Significance test using the t distribution. A test of a null hypothesis versus a two-sided alternative gives t = 2.18.- The sample size is 18. Is the test result significant at the 5% level? Explain how you obtained your answer.
A wooden cube with painted faces is sawed up into 1000 little cubes, all of the same size. The little cubes are then mixed up, and one is chosen at random. What is the probability of its having just two painted faces?
Given the same sample mean and the same sample size which confidence interval estimate would be larger and why: One with a 90% confidence level or one with a 95% confidence level?
What critical values should replace 1.645 and 2.326 in order to apply a Bonferroni correction to this multiple testing situation? What would the result of the Bonferroni correction be in terms of stars?
Let X1, ..., Xn be i.i.d. from the exponential distribution E(0, ?) with an unknown ? > 0. Find a T' -UMA lower confidence bound for ? with confidence
Construct a hypothetical 95% confidence interval for a hypothetical case
What is the expected number of customers who order the special? (-3) What is the standard deviation?
Why has the role of data science become so important to businesses and other organizations?
After listening to them you decide that you like 3 of the songs. With the random feature on your? player, each of the 6 songs is played once in random order
Your supervisor has asked you to prepare a brief report comparing the sales volumes and the consistency of sales of these four salespersons.
Compare the respective purposes of one-way, randomized block, and two-way analysis of variance. In general, under what circumstances would each method be used?
You have administered a worker satisfaction test to a random sample of 25 workers. The test is purported to have a population standard deviation of 4.5
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