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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.
Suggest applications of nonparametric methods to solving business related problems. Describe the example. How are you or could you use nonparametric methods to solve business related problems?
the sampling distribution of the sample mean. use the central limit theorem to find the approximate probability that the mean number of flaws exceeds 1.8 per square yard.
The Spanish patients, two men and two women, were elderly and very ill. All four had undergone routine dialysis at the Hospital de la Princesa.
The average for 14 cross-country runners is 172 mg/dl with a standard deviation of 41 mg/dl. Solve using the Traditional Method. Find the p-value for your test statistic. Use an α = 0.05.
an engineer in charge of process improvement wants to study the relationship between the total number of hours of
Determine the probability that she lives in an all electric home?
Suppose that in order to satisfy legal requirements, a meat pie manufacturer may only produce .2% of pies below a weight of 750grams. If the preceding holds and if the weight of all pies is normally distributed with a standard deviation of 50 gram..
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
twenty years ago postal employees worked for the postal service an average of 7.5 years. recently a sample of 100
U.S. News & World Report publishes the average starting salary and the average GMAT score for MBA graduates at each of the top 80 ranked schools in the country.
On any given day, about 45% of the stocks on the American Stock Exchange increase in value. A random sample of four independent stocks is chosen.
Find the z-score boundaries that separate a normal distribution as described in each of the following: the middle 20% from the 80% n the tails.
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