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A survey of 500 internet users found that the users were online an average of 6.5 hours a week with a standard deviation of 3.1 hours. If 49 internet users are randomly selected what is the probability that their average time online will be more than 7 hours?
When 40 people used the Weight Watchers diet for one year, their weight losses had a standard deviation of 4.9 lb (based on data from "Comparision of the Atkins, Ornish, Weight Watchers, abd Zone Diets for Weight Loss and Heart Disease Reduction, ..
The mean, median, and mode are the most common measures of dispersion (spread).
If the mean lifetime of this type of component is 100 hours and its standard deviation is 19 hours, how many of these component must be in stock so that the probability of the system is in continual operations for the next 2,000 hours is at least ..
Use this information to construct a probability table, and then calculate each of the following probabilities:
Identify Independent and Dependent variable being investigated. Formulate the hypothesis statement regarding your research issue.
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
The total blood cholesterol concentrations, in mg/dL, are shown below for a random sample of six people. In the table below, x is the age of the subject and y is the subject's total cholesterol concentration. Find the 95% prediction interval when ..
Determine whether the difference in proportions is significant at the 0.05 level.
At the 0.05 level of significance, can we conclude Middletown students remained in their districts less time than Brockton students? Make use of 5-step hypothesis testing procedure.
Find out the expected number of correct responses under these circumstances if one in fact selects the responses at random. What is the standard deviation?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
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