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Suppose that blood chloride concentration (mmol/L) has a normal distribution with mean 104 and standard deviation 5. What is the probability the chloride concentration is between 100 and 106? What is the chloride concentration defines the top 10% of samples?
What percentage of employees at the Bureau process fewer forms than Michael? What percentage of employees at the Bureau process more forms than Michael?
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
A rectangular garden has dimensions of 25 feet by 19 feet . A gravel path of equal width is to be built around the garden. How wide can the path be if there is enough gravel for 672 square feet?
A manufacturer of batteries for "kids' toys" wishes to investigate the length of time a battery will last. Tests results on a sample of 10 batteries indicated a sample mean of 5.67 and a sample standard deviation of 0.57.
The following data represents the amount of time in minutes that a person had to wait for a bus to work on a random sample of 5 working days.
estimating the individual score using normal distribution.systolic blood pressure for men is normally distributed with
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
Were the chi-square and regression tests presented and used correctly? Could the authors' analysis be recreated?
consider two random variables x and y. suppose that the variance of x is 20 that this of y is 10 and that the
How many participants need to be enrolled in each group to achieve 80% power using a two-sided test with significance level =.05
Recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
In a study of check out scanners, 5 of 675 items were found to be overcharges, test at the 0.05 significance level, the claim that with scanners, 5% of sales are overcharges.
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