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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 .
Interpret the confidence interval in this context.
after collecting psychological data a regression is performed to relate the depression index to years of formal
the door frames used in an industrialised building system are of one standard size. if the heights of adults are
Chips ahoy. For the computer chips described in Exercise, how many do you expect to test before finding a bad one?
Explain why it is not appropriate to generalize these results to all drivers, or even to all drivers who visit cnn.com. What is the problem with this method of data collection? Is the variable in this study quantitative or categorical?
if y has a normal distribution with a mean of 32 and a standard deviation of 12 and you take samples of size 9 the
a recent survey found that 86 of the population has never been a victim of a violent crime. if a sample of 13 is
A Statistic professsor plans classes so carefully that the lenths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class runs less than 51.5 minutes. Find the probability of selecting a clas..
Assume that one of the subjects is randomly selected. What is the probability that the selected person refused to respond or is over 59 years of age?
Show by counterexample that convergence almost everywhere does not imply convergence in the MS sense.- Show by counterexample that convergence in the MS sense does not imply convergence almost everywhere.
ab and c are evenly matched tennis players. initially a and b play a set and the winner then plays c. this continues
Illustrate how critical values associate to the confidence interval using example variable. Explain how margin of error associates to confidence intervals and to ecology.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:
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