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Suppose we wish to estimate the true population of HSB students who own cars. We randomly sample 100 HSB students and find 20 students own a car. Find a 90% confidence interval for p.
Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
A random sample of stipends of teaching assistants in economics is listed below. Is there sufficient evidence at the alpha=.05 level to conclude that the average stipend different from $15,000? The data is listed below:
The measure of forecast accuracy that is not influenced by the measurement scale of the time series data is:
Graphical method to solveout the linear programming problem. Describe where the following TEO constraints intersect.
Find out a plausible value r for correlation between vehicle weight and miles per gallon (mpg) shown in the scattergram below?
Find out the test statistic s and its two-sided P -value. Do data give good evidence that population mean is not zero?
The average daily jail population in the United States is 706,242. If the distribution is normal and the standard deviation is 52,145, find the probability that on a randomly selected day the jail population is:
Compute the coefficient of determination, r 2 , and interpret its meaning.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out-of-pocket? Write your hypotheses and decision rule.
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
The president of the wholesale distributor is concerned about the possibility of stockouts causing a loss of customer confidence and loyalty and is interested in maintaining safety stock in inventory to prevent potential stockouts.
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