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To find a 99% confidence intervals for the population mean.
Denise is a professional swimmer who trains, in part, by running. She would like to estimate the average number of miles in each week. For a random sample of 18 weeks, the mean is 18.5 miles with standard deviation equal to 3.2 miles. Find a 99% confidence interval for the population mean number of weekly miles.
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
For sample of size 100, what is the mean and standard deviation of the sample mean.
Find out the probability of an event relies on past history of record data. The relative frequency method of computing the probability of an event relies on past history.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Determine the probability that between 5 and 10 minutes will pass between successive occurrences.
What's the probability that among three randomly selected high school students
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
how many chocolate chip cookies will he need to sample to estimate the mean to within 2, what is a 99% confidence interval for the average number of chips per cookie?
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
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