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Many students take the SAT college entrance exam a second time. The change from their first score is known to have a Normal distribution with standard deviation = 42. What size sample would be necessary to estimate the change in a second SAT test score within 5 points with a 95% confidence interval?
Thirty percent of the tourists went to both Beijing and Xi'an. What is the probability that a tourist visited at least one of these places?
the following data are from an independent-measures experiment comparing two treatment conditions.treatment 1
What type of research method did the researcher use in the example?" What are the types of research methods.
In 1997, 39.4% of men had made orders by phone in the last 12 months a market research analyst feels that this percentage has declined because of internet purchases. she obtains a random sample of 500 men and determines that 191 of them have made ord..
Find the probability that the number of rides for a randomly selected Disney World visitor is less than one standard deviation above the mean.
The tournament committee is discussing how many parking spots to contract from the city. If they want to limit the chance of not having enough provided parking.
Calculate the elasticity of substitution in this case and elaborate on your answer.
(b) only the potential type II customers are willing to wait until being served (those of type I go away if the hairdresser and her assistant are busy),
Your goal is have a college fund for your child. Suppose you find a fund that offers an APR of 7%. How much should you deposit monthly to accumulate ?$t86,000 i
Confirm that the standard deviation for sample proportions is largest when the proportion used to calculate it is .50. Do this by using other values.
The article "A Study of Wood Stove Particulate Emissions" (J. of the Air Pollution Control Assoc., 1979: 724-728) reports the following data on burn time (hours) for samples of oak and pine. Test at level .05 to see whether there is any difference..
Let X be the number of hits that Regina gets. As we know, the distribution of X is a binomial probability distribution. What is the number of trials (n).
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