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The distribution of a sample of the outside diameters of PVC pipes approximates a symmetrical, bell-shaped distribution. The arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. About 68% of the outside diameters lie between what two amounts?
One in eight adults says he or she has no trouble sleeping at night. You randomly select six adults and ask if he or she has no trouble sleeping at night.
What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the critical reading part of the test?
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
these cars would fall into the 22 to 27 mpg range? Compute the proportion of cars that get more than 28 mpg. What proportion of cars would get less than 23 mpg?
An article about women in business claims that 28% of all small businesses in the United States are owned by women. Find the critical value (or values), and clearly show the rejection and nonrejection regions. Compute the test statistic. Decide wheth..
The local police academy has 18 new graduates this month that will take the aptitude exam. What is the probability that at most, four candidates will pass the exam?
estimating the expectationa measurement follows the normal distribution with standard deviation that is equal to 15 and
Test the claim at alpha-.05 that the average wage has not changed by finding the p-value for the test.
Test, at the 5% significance level, whether the average cost-to-income ratio amongst all JSE companies adheres to the rule of thumb. Formulate the null and alternative hypothesis and interpret the findings.
find the critical value. assume that the test is two-tailed and that n denotes the number of pairs of data. n 60
given the following demand schedule for newspapers find the optimal order size if papers cost the newsboy .50 and he
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
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