Stats Quiz
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From a sample of 500 items, 30 were found to be defective. The point estimate of the population proportion defective will be:
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Find the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 26 pipes has a standard deviation of 10 inches.
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Which of the following will make a confidence interval narrower and more precise?
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A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
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The t- distribution for developing a confidence interval for a mean has _____ degrees of freedom.
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If you are constructing a confidence interval for a single mean, the confidence interval will___________ with an increase in the sample size.
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Confidence intervals are a function of which of the following three things?
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If you increase the confidence level, the confidence interval ____________.
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The average gas mileage of a certain model car is 26 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 1.3, find the probability that a randomly selected car of this model has a gas mileage between 25.8 and 26.3 miles per gallon.
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