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A real estate agent compares the selling prices of homes in two municipalities in southwestern Pennsylvania to see if there is a difference in price. The results of the study are shown. Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis testing.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
The proportion of parts in an inventory that are outdated and no longer useful is thought to be 0.10. To check this, a random sample of n = 100 parts is selected and 14 are found to be outdated. Based upon this information, what is the probability..
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10-year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3..
In a study of check out scanners, 5 of 675 items were found to be overcharges, test at the 0.05 significance level, the claim that with scanners, 5% of sales are overcharges.
Your high school graduating class had 564 members. Thirty-three percent of these are expected to attend college. The probability that less than 160 will attend college is
For each set of data, calculate mean, median, mode, range, interquartile range, standard deviation, and coefficient of variation.
Easy-Fly Airline took a random sample of 25 flights to determine if the mean time it takes for luggage to reach the travelers departing from a flight is less than 15 minutes. The sample mean was found to be 13.8 minutes with a standard deviation o..
Find out the cheapest way of manufacturing today's batch of NasaMist.
Find the mean and standard deviation for the population and population of exam scores
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