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The mean per capita income is 17,635 dollars per annum with a standard deviation of 891. What is the probability that the sample mean would differ form the true mean by less than 114 dollars if a sample of 441 persons is randomly selected?
Mean 52 and standard deviation 7; N(52, 7). According to the 68-95-99.7 rule, what percentage of jazz CDs play between 38 and 59 minutes?
in 2002 investigators started a study of the association of cholesterol levels and stroke in a group of 2000 healthy
two airlines are randomly sampled to compare the porportion of on-time flights. out of 300 flights 73 of the flights at
If the researcher deems the data to be statistically significant, which of the following is true with respect to a conclusion reached?
suppose you are given data from a survey showing the iq of each person interviewed and the iq of his or her mother.
calculate a 90 prediction interval for a randomely selcted single indivdual from the popultation. with a sample mean of
In calculating the UCR rape rates in New York City, which of the following would appear to be the best data for the denominator?
We have a "test" and a "control" group. We calculated a market share percentage for both groups, the test group was in a market that received advertising from our client, the control group was in a market that did not see advertising.
A bag contains 4 red marbles, 3 blue marbles, and 7 green marbles. If a marble is randomly selected from the bag, what is the probability that it is blue?
What is the average age for each income group, and do the average ages differ for different income groups and what effect do gender and marital status have on annual income
The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviat..
Find E(X). (Note that when a bet is won, the $1 that was bet is returned to the bettor in addition to the $1, $2, or $3 that is won, but the returned dollar does not count as part of the winnings.)
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