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A consulting firm that surveyed consumers' holiday shopping behavior found that the percentage of consumers from the U.S., Canada, and China who said that they planned to spend more on holiday shopping were 40%, 34% and 73%, respectively. Treat these results as representations of the populations. Random samples of size 150 are selected from each of the three countries.
What proportion of the samples from U.S. will have between 30% and 50% of consumers who will spend more on holiday shopping?
the average weight of adult men is 181 pounds with a standard deviation of 40 pounds.thirty five 35 men were asked
Rework Exercise 71, coding the class marks of the history scores -2, -1, 0, 1, and 2 and the class marks of the economics scores -2, -1, 0, 1, 2, and 3. (It follows from Exercise 70 that this kind of coding will not affect the value of r.)
A 90% confidence interval for the difference in the means of the populations
Assuming the frequency of the trait is still 1 in 8, determine the mean and standard deviation of the number of frogs with the trait.
An experiment is rolling two dice. a.) What is the probability that the sum is 6 given that the first die is a 5?
1. Based on the model ?N(1158?,87?) describing steer? weights, what are the cutoff values for
a. Assuming that s1 = 1.2 and s2 = 1.1, test the relevant hypotheses using a = .001. b. Compute b for the test conducted in part (a) when m1 - m2 = 6.
when the background music was slow the mean amount of bar purchases for a sample of 17 restaurant patrons was 30.47
Find a 90% confidence interval for the mean amount spent by patients at the pharmacy. Show your calculations and/or explain the process used to obtain the interval.
This experiment was done in the hope of showing that Scared Straight would cause a lower arrest rate. Did the study show that? Explain.
That is, given n = 431 and p = 0.5, find the probability of at least 235 wins.
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
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