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What is the first big change that American drivers made due to higher gas prices? According to a survey, 30% said that it was cutting recreational driving. However, 27% said that it was consolidating or reducing errands. If these figures are true for all Americans drivers, and if 20 such drivers are randomly sampled and asked what is the first big change they made due to higher prices, what is the probability that none of them said it was cutting recreational driving?
Construct a 95% confidence interval for the true average amount of time customers spent in the restaurant. With a .95 probability, how large of a sample would have to be taken to provide a margin of error of 2.5 minutes or less?
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
Suppose a wedding photographer claims he can finish a bride's wedding photos in less than 7 days. You are given the following data from a sample. Formulate a hypothesis test to evaluate the claim.
What is the probability of selecting a female or an accounting major? Which rule of addition did you apply?
For each of the given population would the score of X=50 be considered central score (near middle of distribution) or extreme score (far out in the tail of the distribution )?
a tennis player has a 68 percent succes rate on first serves and migt serve 85 times in a match. assuming that each
How many students should be surveyed if a 90% confidence interval is desired and the margin of error is to be only 3%?
an urn contains w1 white and b1 black balls. a second urn contains w2 white and b2 black balls. a ball is selected at
concepts and applicationsold faithful geyser time intervals in minutes between eruptions of old faithful geyser in
a draw thenbspscatter plotnbspfor the variables.b compute thenbspcorrelation coefficient. usenbspthree
five applicants apply for two jobs. applicants a and b are male applicants c d and e are female. the personnel officer
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