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Question: Can you taste PTC? PTC is a substance that has a strong bitter taste for some people and is tasteless for others. The ability to taste PTC is inherited. About 75% of Italians can taste PTC, for example. You want to estimate the proportion of Americans who have at least one Italian grandparent and who can taste PTC.
(a) How large a sample must you test to estimate the proportion of PTC tasters within 0.04 with 90% confidence? Answer this question using the 75% estimate as the guessed value for p^.
(b) Answer the question in part (a) again, but this time use the conservative guess p^ = 0.5. By how much do the two sample sizes differ?
the accounting department analyzes the variance of the weekly unit costs reported by two production departments. a
Is there any evidence to suggest that the mean amount of corrosive material carried by trucks in North Carolina is different from the mean amount of corrosive material carried by trucks in Virginia?
boston public school district has had difficulty maintaining on-time bus service for its students a year later school
Let Xn be a wide sense stationary random sequence with expected value µX and autocovariance CX [k]. For m = 0, 1,..., we define
A maker of portable exercise equipment, designed for health-conscious people who travel too frequently to use a regular athletic club.
Given independent random variables with means and standard deviations as shown, find the mean and standard deviation of each of these variables:
An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16. Find the probability that if the airline books 17 people, not enough seats will be available.
If the population standard deviation is known to be 7.5 hours, can we conclude at the 5% significance level that he is right?
Observing a sample of 35 morning customers at a convenience store, a researcher finds their average stay in the store is 3.0 minutes, with a standard deviation of 0.9 minutes
suppose you are told that a 95 confidence interval for the average price of a gallon of regular gasoline in your state
an important feature of golf cart batteries is the number of minutes they will perform before needing to be recharged.
find the 50th percentile median the 25th percentile first quartile the 75th percentile third quartile and the 90th
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