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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Over the last five years in Pa. The variance of new home construction costs has been $108,000. Over the same period of time, based on a sample of 60 new homes , the variance of construction costs in Chester County has been $117,000.
Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 20 specimens from the seam was 4:85. How large a sample size is necessary if the width of the 95% interval is to be :40?
The probability density function of the random variable x is given by f(x)= (3/2)x^2, -1<x<1, 0 elsewhere. Find the cumulative distribution function of the random variable X.
In the linear regression model, it was found that the 90% confidence interval for the regression coefficient B is (1.5,9.3). What can you say, if anything, about the p-value of test of hypotheses Ho:B=0 vs. Ha: B does not equal 0?
A professor in the school of business wants to investigate the prices of new textbooks in the campus bookstore and the competing off-campus store, which is a branch of a national chain.
A one percent increase in the percentage of late arrivals will increase the percentage of late departures by (to 3 decimals). Suppose the percentage of late arrivals at the Philadelphiaairport for August was 22%. What is an estimate of the percentag
A company claims that a new commission policy has resulted in average weekly earning of £380. A random sample of thirty workers is selected and finds that their average weekly earning is £375 and a standard deviation of £30. If t
Find the area of the shaded region. The graph depcits IQ scores of adults and those scores are normally distributed with a mean of 100 and a SD of 15. The area of the shaded region is?round to four decimals.
Find the critical value from Table L for the rank correlation coefficient, given sample size n = 9 and alpha = .05.
Test the claim that the mean GPA of night students is smaller than the mean GPA of day students at the .05 significance level. What are the null and alternative hypothesis?
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