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The mean of the squared deviations of sample values from their mean is an upward-biased estimator of the population variance, a downward-biased estimator of the population variance, an unbiased estimator of the population variance, either (a) or (b), depending on sample size. In order to calculate a large-sample interval estimate.
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The mean incubation time of fertilized eggs is 23 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 1 day. Determine the 20th percentile for incubation times. Determine the incubation times that make up the middle 95%. The 20th percentile for incubation times is days..
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