Estimate the true proportion of home
A report states that 38% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?
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In a recent survey of 205 never-married single women, 78% thought they would eventually find, and marry, their perfect mate. A 95% Confidence Interval for this proportion would be .78 plus or minus
It is estimated that there are 30 depths for every 10 million people who use airplanes. a company that sells fight insurance provides $100000 in case of depth in a plane crash. a policy can be purchases for $1. Calculate the expected value and the
For the following find the appropriate 95% confidence interval for the corresponding population proportion:
The data show the bug chirps per minute at different temperatures. Find the regression equation, letting the first variable be the independent (x) variable.Find the best predicted temperature for a time when a but is chirping at the rate of 3000 c
Cynthia has ordered 3 identical computers for the office. The probability this make and model of computer crashes before it is 2 years old is 0.08 and independent of each other. What is the probability that at the end of the two years, at least 2
Suppose that the middle 68% of families of a certain demographic monthly food expenditures fall between 293.45 and 315.73. Give an approximate estimate of the standard deviation of the expenditures. Assume the expenditures have a normal distributi
One sample is contained in the file labeled THeight. Determine if the process is not producing the tees to specification. Use a significance level of 0.01.
What is the sampling distribution of a sampe mean for a normally distributed random variable.
They expect that about 60% of the student body would respond favorably. What sample size is required to obtain a 95% confidence interval with an approximate margin of error of 0.08? Suppose that 50% of the sample responds favorably. Calculate the
Find the area under the standard normal curve which lies between z = 0.72 and z = 1.59
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