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Find the confidence interval for variance and standard deviation.
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes. Assume the variable is normally distributed.
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
Set up hypotheses and test to find out whether or not population variance is larger than $100.
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
Find out 90% confidence interval for mean grade of all the students in the class.
In order to compare the means of two populations, independent random samples of 484 observations are selected from each population, with the following results:
What is Excel formula in B9 giving first value of coefficient in the objective function?
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
A sample of 200 traffic accidents this year showed 74 persons were also involved in another accident within the last five years. Use the .01 significance level. Can we use z as the test statistic? Tell why or why not.
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
Determine the number of successes suggested by the given statement.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
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