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An accountant wants to estimate the average amount of an account of a service company. A random sample of 46 accounts yields x‾ = $16.50 and s = $2.20. Give a 95% confidence interval for the average amount of an account.
Two regression equations have been developed for different predictions based on different samples of equal size. In one, r = .79 while in the other r = .58. In which situation will the more accurate predictions be made?
new car design specifications are being considered to control the variation of the head injury measurements. use the
What is the equation of the regression model and what is the meaning of the coefficient of x?
You have asked to research the high absenteeism rate in your company. One required analysis is to be by gender. Assume you have been asked to do the study via a survey.
A trucking firm suspects that the mean lifetime of a certain tire uses is less than 35,000miles. To check the claim the firm randomly selects and tests 54 of these tires and gets a mean life time of 34,570
Compute the 95% confidence interval for the percent of homeowners who are dissatisfied with their homeowner's insurance policy.
What are the potential problems with this experimental design and the procedures used? Revise the design and procedures to address these problems.
a simple random sample of 120 sat scores has a mean of 1540. assume that sat scores have a population standard
question a recent study by an automobile dealer revealed the mean amount of profit per car sold for a sample 20
Ball bearings are manufactured with a diameter of 5 mm. But the process has variation, so the diameter is normally distributed with a mean of 5 mm and a standard deviation of .02 mm. A) What proportion of ball bearings are more than 5.03 mm?
Find a 99%. confidence interval for the difference between the average grades for the two courses. Assume the populations to be approximately normally distributed with equal variances.
in a normal distribution of scores four participants obtained the following deviation scores 1 - 2 5 and - 10.a which
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