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An SRS of 18 recent birth records at the local hospital was selected. In the sample, the average birth weight was 119.6 ounces and the standard deviation was 6.5 ounces. Assume that the population of birth weights of all babies born in this hospital follow a Normal distribution, with mean μ. A 95% confidence interval for the population mean birth weight based on these data is A. 119.6 ± 3.23 ounces. B. 119.6 ± 3.00 ounces. C. 119.6 ± 0.76 ounces. D. 119.6 ± 6.50 ounces.
What are the expected value and variance of the following probability distribution?
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level?
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In a random sample of 150 freshman applications received thus far, 67 of the applicants request financial aid. Is there evidence that the proportion of next year's freshmen class needing financial aid has increased?
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Using the critical value approach and the sample information reported below, carry out a test of this statement. Let α = 0.05.
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