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In a recent year, about two-thirds of U.S. households purchased ground coffee. Consider the annual ground coffee expenditures for households purchasing ground coffee, assuming that these expenditures are approximately normally distributed as a normal random variable with a mean of $45.16 and a standard deviation of $10.00.
1. Find the probability that a household spent less than $25.00.
2. Find the probability that a household spent more than $50.00.
3. What proportion of the households spent between $30.00 and $40.00?
4. 99% of households spent less than what amount?
Determine mean of distribution shown. Give the mean of following probability distribution?
What is the purpose of a survey? What are three examples of a survey and what potential purpose could each be used for? How can one work to ensure the participants of a survey will have their responses kept private?
If Procter & gamble sells about 20 million bars of soap per week, but the demand is not constant, and production management would like to get a better handle on how sales are distributed over the year. What might be helpful to the production and (..
(a) Find the median cost of houses at Coal City in 1988. (b) Find the modal selling price of houses at Coal City in 1988.
Suppose the random variable X is normally distributed with mean =50 and standard deviation =7 calculate P(X).
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
30% of college freshmen support increased military spending. If 12 college freshmen are randomly selected, find the probability that more than 5 selected students support increased military spending.
Calculate the sample mean and sample standard deviation.
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
Explain the distribution of mean of samples of size 15.
The average number of customer complaints at the Full Moon Motel is five per day. Find the probability that on a typical day, the motel will receive
Should Martha use an independent-samples t-test or a related samples t-test? Explain your answer.
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