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A box has red marbles and blue marbles. The fraction p of reds is unknown. 250 marbles are drawn at random with replacement, and 102 turn out to be red. Estimate p. Attach a standard error to your estimate.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
A plane has two alternators with the probability that a given alternator will fail on a l hour flight is .02. What is the probability that both will fail
would this prove that they are exceeding their goal, using = .025?
Find the values of the correlation coefficient and the coefficient of determination. Find the slope, y-intercept, and equation of the regression line for the data. Plot the points and a graph of the regression line on the same axes.
the population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a
How much would the company be willing to pay for perfect information on all three sites (together)? Note that after finding out the true nature of each site, the company can still choose no more than one site.
How many drivers in the New York City group of 500 had accidents in the last year? Does it appear that higher insurance rates for New York City drivers are justified?
You play a game with two possible outcomes. Outcome A has probability 0.4 and outcome B has probability 0.6. When B occurs you win $2.00; otherwise, you lose $1.00. What is your expected value for this game?
in a survey of 2000 adults 50 years and older of whom 80 were retired and 20 were pre-retired the following question
if the population standard deviation of the lifetime of washing machines is estimated to be 900 hours how large a
A firm keeps account for 28 customers. 12 of these are defined as new customers and 14 are locally based. If just 3 new customers live locally, how many established customers do not live locally?
a fitted model with more predictors will necessarily have a lower training set error than a model with fewer
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