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You are to conduct a sample survey to determine the mean family income in a rural area of central Florida. The question is, how many families should be sampled? In a pilot sample of 10 families, the standard deviation of the sample was $500. The sponsor of the survey wants you to use the 95 percent confidence level. The estimate is to be within $100. How many families should be interviewed?
An optical ?rm buys glass slabs to be ground into lenses, and it is known that the variance of the refractive index of the glass slabs is to be no more than 1.04 × 10-3. The ?rm rejects a shipment of glass slabs if the sample variance of 16 pieces..
Find the probability that the number who considers themselves baseball fans is (a) exactly eight (b)at least eight and (c) less than eight. If possible use technology to find the probabilities.
Suppose you are an event coordinator for a large performance theater. One of the hottest new Broadway musicals has started to tour, and your city is the first stop on the tour.
in a study was conducted concerning the relationship between pet ownership and physical activity in older adults. of
Why crime statistics should be collected, how they are used, and how analysis of those statistics could benefit the community.
Suppose a coin is flipped and a die is rolled. Let E1 denote the event "the coin shows a tail", let E2 denote the event "the dies shows a 3", and let E3 denote the event "the coin shows heads and the die shows an odd number".
Write a first-order model for arsenic level (y) as a function of latitude, longitude, and depth.- Fit the model to the data using the method of least squares.
suppose the people living in a city have a mean score of 47 and a standard of 3 on a measure if concern about the
Determine the sample size necessary under the following conditions. To estimate with = 44, E = 3, and 95% confidence. To estimate with a range of values from 20 to 88 with E = 2 and 90% confidence.
In a hospital, a sample of 8 weeks was selected, and it was found that an average of 438 patients was treated in the emergency room each week. The standard deviation was 16. Find the 99% confidence interval of the true mean. Assume the variable is..
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
according to a survey 90 of senior executives at major u.s corporations felt that the federal budget will not be
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