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A survey of teenagers and parents in Canada conducted by the polling organization Ipsos ("Untangling the Web: The Facts About Kids and the Internet," January 25, 2006) included questions about Internet use. It was reported that for a sample of 534 randomly selected teens, the mean number of hours per week spent online was 14.6 and the standard deviation was 11.6.
a. What does the large standard deviation, 11.6 hours, tell you about the distribution of online times for this sample of teens?
b. Do the sample data provide convincing evidence that the mean number of hours that teens spend online is greater than 10 hours per week?
Name the two populations and then formulate the null and alternative hypothesis to address the subcommittee's management question. Test the null hypothesis at the 1% significance level.
Compute the population mean, the population median, the population midrange, the population range, the population variance, the population standard deviation, and the population proportion of odd numbers. Verify the following results:
what is the average price of a house in franklin county oh? we took a random sample of 100 houses and found the average
usa today ran a report about a unc poll of 1248 adults from the southern u.s. it was reported that 8 of those surveyed
Let x1,..., x16 be an independent sample from a normal distribution N(μ, 5). For the following test problem: Ho: μ = 6.5 ↔Ha: μ ≠6.5, let the rejection region be W = {|x-6.5| ≥ c}, If μ = 7.5 is correct, find the probability of the second type erro..
(i) Determine the number of days each probe is expected to last. (ii) If the reactor operator wishes to run a product campaign that lasts continuously for 20 days, determine the probability of running this campaign without having to replace the..
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
Calculate the margin of error that would be used to determine a 95% confidence interval for the mean pulse rate of all women.
If he is a 1 to 2 favorite to win the Belmont Stakes as well, what is his probability of winning the Triple Crown? What do his chances for the Preakness Stakes have to be in order for him to be "even money" to earn the Triple Crown?
When 343 college students are randomly selected and surveyed it is found that 110 own a car. find a 99% confidence level for the true population of all college students who own a car.
Do the boxplots have comparable centers, or does it appear that one type of school has mean scores that are noticeably higher or lower than the other type?
Brakes for a model of automobile fail with a Poisson distribution at an annual rate of 4.4/yr. What is the probability that
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