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A sample of 3000 observations has a bell-shaped distribution with a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals x-bar ± 1s, x-bar ± 2s, and x-bar ± 3s.
How large a sample should she check in order to be 90% confident that the true proportion is estimated to within 1.5%?
Replacement times for CD players are normally distributed with mean of 7.1 years and a standard deviation of 1.4 years (based on data from "Getting Things Fixed," Consumer Reports). Find the probability that a randomly selected CD player will have..
a researcher is interested in finding out whether the variance of the annual repair costs also increases with the age
mathew r. is conducting a study on the dollar value of orders placed with various suppliers. a sample of 10 orders
How many ways can three items be selected from a group of six items? Use the letters A, B, C, D, E, and F to identify the items, and list each of the different combinations of three items.
Suppose the mean time that was observed for the sample last month was 4 hours 44 minutes (284 minutes). What is the probability of seeing a sample mean this high or higher?
The following survey questions have been established for a medical errors and patient safety business research paper:
How do hypothesis-testing procedures differ for the population mean when the population standard deviation is known or unknown? What is the relationship between two-sided hypothesis tests for means and confidence intervals?
The case information stated that 66% of teenagers purchase products that reflect their style and image as being hip and trendy. How would you test the appropriateness and validity of that percentage? In a test where 900 teens are randomly selected ac..
Show the sampling distribution of if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
The weights are expressed in kilograms.
a standard deck of cards contains 52 cards. one card is randomly selected from the deck.a. compute the probability of
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