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Suppose a secondary outcome is recorded in the trial described in Problem 10 reflecting asthma symptom severity measured on a scale of 0 to 100, with higher scores indicating more severe symptoms. In the participants who receive the experimental medication, the mean symptom score is 74 with a standard deviation of 5.6, and in the placebo group, the mean symptom score is 85 with a standard deviation of 6.0. Is there a difference in mean symptom scores between groups? Run the appropriate test at a 5% level of significance
suppose the average family of 4 washes 2000 lbs of laundry each year. assume the variable is normally distributed with
an ecologist wishes to mark off a circular sampling region having radius 10 meters. however the radius of the resulting
A parent is deciding which babysitter to use in the neighborhood. Babysitter A charges $20 per hour and a base rate of $60 per day. Babysitter B charges a base rate of $50 per day and $25 per hour.
a manufacturer of a certain type of large machine wishes to buy rivets from one of two manufacturers. it is important
you are asked to determine whether or not brunette students have a higher iq score than other students. to do so you
Find out the mean number of letters that will arrive in two days.
Candies manufactured by Cherrie Chocolate Candies Co, are supposed to weigh at least 2.00 ounces. A sample of 100 candies yields the following results.
Critically discuss the lower control limit for a proportion defective if the average daily production is 5000 units and the average fraction defective is .02?
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
Imagine you are the CEO of a local bank whose credit card holders engage in 1 billion credit card transactions per year; that the likelihood of a fraudulent transaction is 2%
Statistics Test Scores - Tests in the author's statistics class have scores with a standard deviation equal to 14.1. One of his last classes had 27 test scores with a standard deviation of 9.3.
Find the 95% confidence interval for the mean, of the population from which the sample was drawn. (Round the values to whole numbers for your confidence interval.)
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