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During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes.
a. What is the expected number of calls in one hour?
b. What is the probability of three calls in five minutes?
c. What is the probability of no calls in a five-minute period?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
assume that iq scores are normally distributed with a standard deviation of 11 points and a mean of 100 points. if 140
A packaging company distributes quarter-pound beef patties to local fast-food restaurants. The restaurants demand the weights to be 4 plus or minus .02 ounces.
What is the probability that someone selected at random will score 81 or lower and what percentage of all trainees will score between 60 and 75?
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
for the xy data below computea r and determine if it is significantly different from zerob the slope of the regression
The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample median and sample mean are respectively:
Your company builds roads, bridges, schools and other multi-million dollar public construction projects. Competitive bids are made for the contracts to undertake these projects. For each project there are three costs:
suppose that you want to estimate the mean ph of rainfalls in an area that suffers from heavy pollution due to the
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
The same probability of getting choosen. In how many different ways can the teams be chosen so taht the number of employees on each project are as follows: 5 1 10.
State the null hypothesis H 0 and the alternative hypothesis H 1 that we would use for this test. Determining null and alternative hypotheses for the height of a plant.
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