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Confidence interval mistakes and misunderstandings. Suppose that 101 randomly selected members of the Karaoke Channel were asked how much time they typically spend on the site during the week.5 The sample mean x was found to be 4.2 hours, and the sample standard deviation was s = 2.5 hours
(a) Cary Oakey computes the 95% confidence interval for the average time on the site as 4.2 ± 1.984(2.5/101). What is his mistake?
(b) He corrects this mistake and then states that "95% of the members spend between 3.71 and 4.69 hours a week on the site." What is wrong with his interpretation of this interval?
(c) The margin of error is slightly less than half an hour. To reduce this to 15 minutes, Cary says that the sample size needs to be doubled to 202. What is wrong with this statement?
Do the independent variables correlate statistically significantly and practically with the dependent variable?
The mean incubation time for a type of fertilized egg kept at 100.5°F is 23 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 day.
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High School GPA is normally distributed with a mean of 3.06 and a standard deviation of 0.40. The probability of a randomly chosen student having a HS GPA between 3.54 and 3.80 is
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What fraction of the calls last between 4.2 and 5 minutes?
After a second two-week period, the LDL cholesterol level of each person was recorded again. The data are shown in Table E2.18. Calculate the LDL difference (cornflake-oat bran) for each of the 14 men, then the mean x, variance s2, and standard de..
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Suppose two groups of 20 random orders are independently selected. What is the probability that at least 16 orders will be filled correctly in both groups?
suppose x1 x2 ... xnnbsp is random sample from a distribution with the ff. pdfnbsp fx 2xnbsp oltxlt1find the
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