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The Roper Organization conducted a poll in 1992 (Roper, 1992) in which one of the questions asked was whether or not the respondent had ever seen a ghost. Of the 1525 people in the 18- to 29-year-old age group, 212 said "yes."
a. What is the approximate margin of error that accompanies this result?
b. What is the interval that is 95% certain to contain the actual proportion of people in this age group who have seen a ghost?
What are the minimum and maximum heights it should use as a basis for its design?
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
We have a box of 12 light bulbs. The probability that a particular light bulbs lights on opening is 0.95. This meets the binomial assumptions. Find the probability that 9 light bulbs light up.
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Loans that are 60 days or more past due are considered seriously delinquent. The Mortgage Bankers Association reported that the rate of seriously delinquent loans has an average of 9.1% (The Wall Street Journal, August 26, 2010). Let the rate o..
Diamonds and Hearts are red and Clubs and Spades are black. Suppose you randomly select three cards from the deck. The outcome of interest is the colour of each of the selected cards.
Find the indicated area under the standard normal curve. To the left of z= - 1.96 The area to the left of z = -1.96 under the standard normal curve is __.(Round to four decimal places as needed.)
a normal population has a mean of 60 and a standard deviation of 11. you select a random sample of 9. compute the
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question suppose that in past years the average price per square metre for warehouses has been 322.80. a national real
stating the hypotheses. in each of the following situations a significance test for a population mean acircmicro is
Convicted in 1993 of the murder of 4 children, which nurse allegedly suffered from a medical condition known as "Munchausens syndrome by proxy"?
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