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Rhe frequency distribution summarizes a sample of times (in minutes) between eruptions of a cretain geyser. Find the approximate population mean and approximate population standard deviation of the data.
Time Frequency
40-49 8
50-59 43
60-69 25
70-79 7
80-89 104
90-99 12
100-109 1
Problem based on combinatory - how many different license plates are possible?
Compute fraction of the employees cost between $1,500 and $2,000 per year? Evaluate percent that didn't have any dental expense.
Statistical Hypothesis testing - Frequency distribution
Build a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
Make a histogram for the r probability distribution.
Calculate correlation coefficient for these sample data.
Comment on their success or failure to meet this goal.
At the .05 level of significance, can we conclude the Middletown students stayed in their districts less time than the Brockton students? Use the five-step hypothesis testing procedure.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
Use population distribution to determine expected juror frequencies. Test researcher's claim at a = 0.01.
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
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