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The meat department of a supermarket sells ground beef in approximate 1 lb packages, but there is some variability. A random sample of 65 packages yielded a mean of 1.05 lbs and a standard deviation of .23 lbs. What is the 95% Confidence Interval for this problem?
suppose that fifty-two percent of the residents of the city eugene think that arizona will defeat oregon in their next
A researcher expects the population proportion of the Cubs Fans in Chicago to be 80%. Error of less than 5% confident of an estimate to be made from a mail survey. What is the sample size required?
based on a survey of 1000 adults by greenfield online and reported in a may 2009 usa today snapshot adults 24 years of
Using the empirical rule, what is the approximate percentage of women between 156cm and 166cm? Using Chebyshev's Theorem, at least what percentage of women are between 149cm and 173cm?
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
In part b, the sample have greater variability than part a, but the sample sizes are unchanged. how does the larger variability affect the size of the standard error for the sample mean?
for the following distributionp px0 .0271 .1892 .4413 .343what is the mean of the
question two builders a and b are competing for a contract to construct a new office block. each can bid either
The following table is from the Social Security Actuarial Tables. For each age, it gives the probability of death within one year, the number of living out of an original 100,000 and the additional life expectancy for a person of that age.
according to a recent survey the average urban person consumes 1.5 kg of food per day. is this figure accurate for
The accuracy of the scanner price of each. Let x represent the number of the five items that is priced incorrectly. Use the information in the FTC study to estimate p for the binomial experiment.
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
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