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A non for profit company experiments with two procedures for contacting regular donors. In the first procedure, a phone call is made, the non-for-profit's objectives for the coming year are discussed and any questions are answered. The second procedure is similar, except that an agent of the non-for-profit arranges to meet with donors in their homes. For a random sample of 80 donors contacted by telephone the mean donation that resulted was $115 and the standard deviation was $71. For an independent random sample of 60 donors receiving a home visit, the mean and standard deviation of donations received were $131 and $83 respectively. Test the null hypothesis that the two populations means for donation value are equal against the alternative that they are not equal.
a. State the null and alternative hypothesis
b. Compute the test statistic
c. Compute the p-value and interpret it relative to the acceptance or rejection of the null hypothesis.
According to the Chebyshev rule, at least what percentage of the observation in any data set are contained within a distance of 3 standard deviations around the mean.
Using a three month moving average, what would the forecast and MAD have been for July? Which forecasting method would you recommend? Why?
the number of beetles in a lawn varies with an average of 1.3 square yard. what is the approximate probability of
A 95% confidence interval for the average difference between the two reaction times (traditional - LED) was (-171.37, 174.44). Which of the following is the appropriate conclusion?
Given that Z is standard normal randam variable. Compute the value of Z if area between –Z and Z is 0.754:
identify which sampling technique was used in the following studya journalist asks 17 friends about their opinion on
multiple choice questions based on regression.the following information regarding a dependent variable y and an
power inc. produces aa batteries used in remote-controlled toy cars. the mean life of these batteries follows the
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
If a population is known to be normally distributed with m = 250 and s = 40, what will be the characteristics of the sampling distribution for x based on a random sample of size 25 selected from the population?
The researcher will then compare the scores for the two treatments. If there is a difference between the two groups of scores. Briefly explain how the difference simply may be sampling error.
a hot dog vendor provides onions relish mustard ketchup dijon ketchup and hot peppers for your hot dog. how many
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