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A professor is interested in comparing the average amount spent on textbooks for freshmen and sophomores. A random sample of 9 freshmen yielded a sample mean amount of $1031 and a sample standard deviation of $58. A random sample of 9 sophomores yielded a sample mean amount of $1225 and a sample standard deviation of $313. Construct a 99% confidence interval for the difference between the mean amount spent on textbooks by freshmen and the mean amount spent by sophomores (ie. do freshmen minus sophomores). Since the sample standard deviations are wildly different, use a method which does not assume the populations have the same variance.
a) What is the appropriate degrees of freedom in this case? Give your answer to four decimal places.
b) What is the lower confidence limit on the interval? Give your answer to two decimal places.
c) What is the upper confidence limit on the interval? Give your answer to two decimal places.
The manager of Sandy Corporation wants to determine whether or not the type of work schedule for her employees has any effect on their productivity. She has selected 15 production employees at random and then randomly assigned 5 employees to each ..
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Is there evidence to suggest that the training course helps out sales people?
during each four-hour period the smalltown police force requires the following number of on-duty police officers eight
What are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
Assume that the population is normally distributed. Can we conclude, at the level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from months?
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A Tire company has developed a new type of tire. Extensive testing shows that the number of miles the new tire will run before wearing out is normally distrubuted with a mean of 40,000 miles and a standard deviation of 4,000 miles
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Determine the probability the sample of 40 will have a sales average less than $400,000.
An averages of four tax evaders per 100 tax filers. If 50 tax filers are randomly selected from the state, what is the probability of the following:
What is the equation for this regression model?
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