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The lenght of time, X, to complete a standard achievement test is approximately normally distributed with a mean of 58 minutes and a stabdard deviation of 9.5 minutes. If professor yosca wants to time the exam so that it will be completed by 92% of students, how long of an exam period must be scheduled?
We monitor the number of incoming calls into a doctor's office. Let X be the number of incoming calls between the hours of l pm and 2 pm and Y be the number of calls between l pm and 3 pm.
a drug is assumed to be e?ective with an unknown probability p. to estimate p the drug is given to n patients. it is
The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (d) Neither will fail? (c) One or the other will fail? Show all steps carefully.
The researcher estimated that out of the 100 students at least 50% of the students would be exposed to movies and TV w/ crude humor at least 2-4 times per week.
1. Consider a point on the Trans-Australian Highway, where two old wombats live. Arrivals of cars at this point follow a Poisson distribution; the average rate of arrivals is 1 car per 12 seconds.
hypothesis testing is one of the mainstays of medical research literature. you would be hard-pressed to find a research
1. many television viewers express doubts about the validity of certain commercials. in an attempt to answer their
q1. you roll a single die numbered from 1 to 6 twice. what is the probability of rolling a six the first time and an
Analyse sample variances in order to find which test would likely be most appropriate to employ to test the equality of the population means, pooled or unpooled?
Find the probability taht exactly 6 are satisifed with the airlines. Find the probability that fewer than 4 are satisfied with the airlines. Find the probability that 5 or more are satisfied with the airlines. Find the probability that between 3 a..
the amounts a soft drink machiene is designed to dispense for each drink are normally distributed with a mean of 12.2
A currency trader observes that in the spot exchange market, 1 U.S. dollar can be exchanged for 9 Mexican pesos or for 111.23 Japanese yen. What is the cross-exchange rate between the yen and the peso
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