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Question: Let us compare the distribution of the number of lifetime gifts of those who made a current donation to that of those who did not. We will use two data sets, each indicating the number of gifts (lifetime gifts, previous to this mailing) given by the 20,000 people represented in the donations database (on the companion site). One data set is for those who did not make a donation in response to this mailing (named "gifts_D0" with 19,011 people), while the other is for those who did (named "gifts_D1" with 989 people).
a. Find the average and standard deviation for each data set. Compare and interpret these values.
b. Compare these averages and standard deviations to the average and standard deviation of the lifetime gifts for the full database of 20,000 people.
Test of claim for the statement made for a given paired sample:
The researchers discovered ‘‘an interaction between blade position and turntable speed.'' Hypothesize a regression model for E(y) that incorporates this interaction.
when evaluating a new process using the square root of the upper end of the confidence interval for ?2 gives an
Is it possible to find three pairs such that if the matching among them is changed, each man will be matched to a woman whom he prefers, and each woman will be matched to a man whom she prefers?
to decide whether two different types of steel have the same true average fracture toughness values n specimens of each
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The managers in a company's East and West regions were rated on the basis of the company's evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions.
What is the probability that the average time spent per customer will be at least 3 minutes?
Determine the regression equation for predicting scholarly productivity (Y) from institutional comprehensiveness (X). For an institution with a comprehensiveness score of 175, predict the psychology department's scholarly productivity score
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