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The average length of a long distance telephone call is 28 minutes with a standard deviation of five minuts. assuming the call times are normally distributed, what percentage of calls are longer than 35 minutes.
How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.04 with 98% confidence?
There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another. One of statistics professors was interested in the study, and after 6 ads finally got the address to write away for it f..
What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
Formulate the appropriate null and alternative hypotheses to test the manufacturer's belief. Using the sample mean of 99.2, compute a 90% confidence interval. Show the computation, and interpret in one sentence the interval you compute.
ACME Lumber Company selects a random sample of 36 customers. Customers are rated on their annual spend at ACME Lumber Stores.
Assume R is commutative ring. Prove that the following are equivalent: Here N(R) denotes the nilradical of R. The set of nilpotent elements form an ideal called the nilradical of R
Find the mean, median, and range for each of the two data sets. b.Find the standard deviation using the rule of thumb for each of the data sets.
Category of decision rule which contains maximax decision rule is?
The following table gives the approximate age distribution in the United States from the 2000 census.
If, on the average, 20 orders are received by fax every two hours throughout the day, find the a. probability that a faxed order will arrive within the next 9 minutes.
Assume that causes of heart failure between individuals are independent. What is the probability that three individuals have conditions caused by outside factors?
Some students planned a get together, the budget for food was $500.00. Five of the students failed to come because of the distance ad therefore the cost of food for each member increased by $5.00.
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