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Of those mountain climbers who attempt Mt. McKinley, only 65% reach the summit. In a random sample of 16 mountain climbers who are going to attempt Mt. McKinley, what is the probability of each of the following?
(a) All 16 reach the summit.
(b) At least 10 reach the summit.
(c) No more than 12 reach the summit.
(d) From 9 to 12 reach the summit, including 9 and 12.
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us - chance variation." Is this a good defense? Justify your answer.
1) The mean of the twenty male IQ scores is 115. Test the hypothesis that the mean of female IQ scores is less than 115. Note: This test is not comparing the mean IQ of females to that of males, it is simply using 115 as a comparison value. In the..
Find out the best predicted household size given that the household discards 5.00 lb of plastic.
A normal distribution with a mean of 60,000 miles and a standard deviation of 5,200 miles. What percent of the tires will last at least 75,000 miles?
If there is one-year warranty on the equipment, what proportion of the customers will actually make a valid warranty claim?
Twenty five young people were sampled in a survey to be used in determining the average expenditures (in dollars) for an evening of dining out.Create a cumulative relative frequency Ogive chart.
The average shaft size for the E300 electric motor is .55 inch, with a standard deviation of .10 inch. It is normally distributed. What is the probability that a shaft selected at random will be between .55 and .65 inch?
A recent national study showed that approximately 30% of college students binge-drink. Let x equal the number of students in a random sample size of n=12 who binge drink. Find the probability that
The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. What proportion of students drank 7 or more cups of coffee per day?
A decade-old study found that the proportion, p, of high school seniors who believed that "getting rich" was an important personal goal was 75%. A researcher decides to test whether or not that percentage still stands.
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Estimating the value of the population mean on the basis of the sample mean alone produces a(n):
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