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Question: A public broadcasting station plans to launch a special appeal for additional contributions from current members. Unsure of the most effective way to contact people, they run an experiment. They randomly select two groups of current members. They send the same request for donations to everyone, but it goes to one group by e-mail and to the other group by regular mail. The station was successful in getting contributions from 26% of the members they e-mailed but only from 15% of those who received the request by regular mail. A 90% confidence interval estimated the difference in donation rates to be .
For opinion polls like this, which has more variability: the percentage of respondents answering "yes" in either year or the difference in the percentages between the two years?
a company produces bolts for large-scale construction projects. the shear strength x of the bolts is assumed to be a
Calculate a 95% confidence interval that estimates the proportion of all Americans in 2009 who thought abortions should be legal only under certain circumstances.
The test results indicate that the disease is present. What is the probability that the person actually has the disease?
Compute the probability that student eats at fast food restaurant 2 or more times per week?
A die is rolled 180 times. Find the expected number of aces, and the variance for the number of aces. The number of aces will be around___________, give or take_____________ or so. (A die has six faces, all equally likely; the face with one spot i..
Compute the standard deviation for the company and the index. Compute the correlation coefficient between Tokyo Ltd and the index. Compute the beta for Tokyo Ltd
If the salaries are normally distributed with a standard deviation of $5,000, find the probability that An individual graduate will have a salary over $45,000.
Let the random variable x represent the number that are not correctly calibrated. Find the mean and standard deviation for the random variable x.
on one busy holiday weekend a national airline has many requests for a standby flights at half of the usual one way
If the total weight of the two bags, X1 + X2 exceeds 105.4 pounds, a surcharge is added onto the shipping cost. What percentage of all shipments can be expected to result in a surcharge being added to the shipping cost?
one person has 3 dollars to gamble each time he uses only one dollar the probability is 60 to lose and 40 to win. if he
A Department of Trasporta repot about air travel found that nationwide, 76% of all flights are on time. What is the probablity that you will have have excatly 80 flights on time?
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