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A random sample of 100 record shops found that the average weekly sale of a particular single was 260 copies, with standard deviation of 96.
a) Compute the 95% confidence interval to estimate the true average sale for all shops.
b) To compile the record chart it is necessary to know the correct average weekly sale to within 1% of its true value. How large a sample size is required?
c) Why is an interval estimate better than a point estimate? What factors determine the width of a confidence interval?
Write three quadratic equations within a, b, c (coefficients of x^2, x and the constant as 1 integers, 2 rational, 3 irrational numbers).
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports they can resolve customer problems the same day they are reported in 70 percent of the cases.
Answer the following three questions based on what you know about statistics now.
Find the indicated percentage for the normally distributed variable. Round your answer to two decimal places, if necessary.
Which of the following is true about the random variables X, Y, and Z?
Suppose you went to the Bureau of Labor Statistics web site and found several predictors of your salary. State three possible predictors and a simulated multilinear regression equation along with their p-values. What does your p-values tell you ab..
Neckwarmers. Mountainside Fleece sold 40 Neckwarmers. Solid-color neckwarmers sold for $9.90 each and print ones sold for $12.75 each.
If the politician is correct, what is the chance that you would observe 9 or fewer accidents involving a teenage driver?
Of the adults in Jefferson County, 10% have had CPR training
Using variables below, (1) mention all research questions that would be replied with a Two Way ANOVA test, (2) make null hypotheses for these questions.
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
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