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In a recently conducted study, families reported using an average of 70 gallons of gasoline per month with a standard deviation of 9 gallons. If a family is chosen at random, what is the probability that it uses between 80 and 86 gallons of gasoline per month? Assume the data is normally distributed.
Tthe standard deviation was $32. Calculate a 95% confidence interval for the mean health cost per worker per month for all small companies.
the piron software company currently develops marketing software for primarily service-based organizations. recently
1.a study was conducted to explore the relation between alcohol consumption and hypertension. 7400 nurses were surveyed
Researchers for an online market- ing company suggest that new customers who have to become a member before they can check out on the website are very intolerant of long applications. One way to rate an application is by the total number of keystr..
suppose we determine that an instrument in our regression is weak. would using a polynomial in the first stage
An analyst in the publishing industry wants to ?nd out whether the cost of a newspaper advertisement of a given size is about the same in four large newspaper groups. Random samples of seven newspapers from each group are selected, and the cost of..
Crash Test Results The National Transportation Safety Administration conducted crash test experiments on five subcompact cars. The head injury data (in hic) recorded from crash test dummies in the driver's seat are as follows: 681, 428, 917, 898, ..
Describe a possible sampling procedure using a nonprobability sampling technique.- Then describe how you might sample books using a probability sampling technique.
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
During their annual membership drive, they hope to sign up 50 new members each day. Would you expect the distribution of the donations for a day to follow a Normal model? Explain.
Given the recursively defined sequence a_1= 0, a_2= -30, and a_n=8a_n-1 -15a_n-2, use complete induction to prove that a_n=5*3^n - 3*5^n for all positive integers n.
According to a recent survey, the probability that a passengerfiles a complaint with the Department of Transportation about aparticular U.S. airline is .000014. Suppose 100,000 passengers whoflew with this particular airline are randomly contacted..
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