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An airline is interested in determining the proportion of its customers who are flying for reasons of business. If the airline wants to be 90% confident that its estimate will be correct to within 2 percent (that is, the margin of error is 2%), how large a random sample should it select?
A baseball player gets a hit in 30 out of 100 times at bat. What is the probability that he gets a hit in his next at bat?
Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.
Two colored dice are tossed. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
in a study of the effectiveness of garlic for lowering cholesterol 17 subjects were treated with garlicin which is
Suppose you decided to switch from a 99 to a 95 percent confidence interval. Without performing any calculations, will the interval increase, decrease, or stay the same? Which f the values in the formula will change?
Calculate expected number of interruptions per day. Calculate standard deviation.
Use the following information from a normal population with mean μ = 52 and variance σ2 = 22.5 to calculate the following questions.
Find out correlation coefficient r, If student take 35 minutes to complete exam, what is his predicted score.
Category of decision rule which contains maximax decision rule is?
Using quadratic regression model find the estimated number of planes.
a 95 confidence interval for mean diastolic blood pressure in women is 62 to 110. what is the margin of error? what is
a fair die is thrown until the sum of the results of the throws exceeds 6. the random variable x is the number of
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