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The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.
a. With 95% confidence, what is the margin of error (to 2 decimals)?
b. What is the 95% confidence interval estimate of the population mean?
c. Two years ago the average cost of a hotel room in New York City was $229. Discuss the change in cost over the two-year period.
1. using the data collected from the student data survey at the beginning of the course construct a
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
The one time fling. Have you ever bought the article of clothing (dress, sports jacket, etc.) worn item once to a party, and then returned purchase?
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Suppose we have the following information from a simple regression: What is the coefficient of determination? What is the correlation coefficient?
Write down the differential equations which describe the probabilistic behavior of the unit in time as a Markov process.
A person purchases a package of 10 ball-point pens which, unknown to the purchaser, contains 4 defective pens. Of the first 2 pens used by the purchaser
1 the average score for male golfers is 95 and the average score for female golfers is 106 golf digest april 2006.
suppose that you work for the child social services agency in your county. your job is to investigate instances of
If the average daily intake among 25-34-year-old males in the general population is 15 g, then, using a significance level of .05, test the hypothesis that the intake of linoleic acid in this group is lower than that of the general population. Als..
At 1 excavation site 8641 pot shards have been found that have not presently been cleaned also identified. Define the probability.
A test is given to graduates of tw buisness schools A and B. The scores are given out of 100. Test whether the school differ in quality by using Mann- Whitney U- test with a 10% level of significance.
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