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Ann's Facebook page has 198,400 Likes. A survey was posted on Ann's Facebook page about whether people who Liked the page would by an ebook authored by her. Assume that the truth is 5% would buy.
a) What is the probability that a survey of 250 respondents would indicate 5% or more would buy an ebook?
b) Is it likely that the sampling procedure created a biased sample? Discuss, including suggestions for improvement if appropriate.
Find a 95% confidence interval for the difference in the average room rates for the Hotel A and the Hotel B chains. (Round your answers to two decimal places.)
If one person is arbitarily selected from this sample, determine probability of getting someone who is age 18-22 or doesn't smoke.
A researcher is wondering about racial preferences in dating among college students and asks a large sample of undergraduates.
Of all college students who are eligible to give blood, about 18% do so on a regular basis. Each month a local blood bank sends an appeal to give blood.
A newspaper reports that the gover- nor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
"Religious attendance and cause of death over 31 years" on the CD. For this study, the researchers used a complicated statistical method.
n its study of constant improvement, the manufacturer changes the mean setting of the machine to 1.0 mm. If the standard deviation is the same as before, what is the expected total daily cost of rework and scrap?
A certain health spa claims its clients have BMI between 23.5 and 24. Suppose eight health spa clients are selected at random. What is the probability that the sample mean will be in this interval?
An alternative proof of Theorem 2 may be based on the fact that if X1, X2, ..., and Xn are independent random variables having the same Bernoulli distribution with the parameter θ, then Y = X1 + X2 +···+ Xn is a random variable having the binomial di..
a survey of a sample of 342 people is conducted. the surveys respondents are classified according to their political
the following table was presented in an article summarizing a study to compare a new drug to a standard drug and to a
n article by Julia Moskin in the New York Times reports on the use of cheap wine in cooking.- Find the mean, median, and modes of these data. Based on these data alone, do you think cheap wine works?
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