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The manager of a grocery store wants to determine what proportion of people who enter his store are his regular customers. What size sample should he take so that at 97% confidence the margin of error will not be more than 0.1?
The manufacturer of a nationally known "lite beer" claims that the approval rating for it's product is at least 85%. A local soft drink manufacturer has retained a marketing agency to test the "lite beer".
Calculate the test statistic (z-score) for the sample. What decision should be made about the null hypothesis, and what decision should be made about the effect of the program.
The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
Compute the z-score corresponding to each of the following values of x: What is the 50th percentile of a quantitative data set called?
(a) a white chip on the first draw?
Assume you want to estimate the population proportion,p, and the estimator for the mean proportion (p-hat)= 0.34, N = 6000, and n = 1300. Find an approximate 95% confidence interval for p.
An investment firm with 10,000 clients would like to accurately forecast the average dollar amount their current customer will deposit over the coming year.
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
The comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
in usa today sept. 5 1996 the results of a survey involving the use of sleepwear while traveling were listed as
Suppose the graduate exam is normally distributed with a mean of 500 and a standard deviation of 200. If a test taker is randomly selected, what is the probability he or she scores 750 or better?
An electronic company is about to launch a new product.if the serial number for each piece produced has the following format:LLNNN where L stands for any letter in English and N is a number from 0 to 9,what is the name of the counting rules used t..
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