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A fast food chain sells its burgers alone or as part of a "value meal" which includes fries and a drink. They know some customers are health conscious. They want to do an experiment to see if the proportion of customers choosing the meal would increase if they offered baby carrots with the meal as an alternative to the fries. They will compare three treatments: (1) status quo, (2) offering carrots as an alternative, but with no advertising, and (3) offering carrots as an alternative, and advertising this option in the local area.
a. What are the explanatory and response variables?
b. Diagram the experiment.
Construct a 99% confidence interval estimate of the population mean amount of paint in a 1-gallon can.
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A 2007 study reported in Science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation w..
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
Using the p-value approach, test the hypotheses at the 1% level of significance.
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
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What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
Give the Z score for person who scores (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z score on this test are (d) 2.4, (e) 1.5, (f) o, and (g) -4.5
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