Statistical inferences about a population variance
What assumption must hold to make statistical inferences about a population variance?
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The 8 high-capacity rats had mean blood pressure 89 with standard deviation 9; the 8 low-capacity rats had mean blood pressure 105 with standard deviation 13. (Blood pressure is measured in millimeters of mercury.)
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Assume that a random sample of nine measurements from a normally distributed population gives a sample mean of (xbar = 2.57) and a sample standard deviation of s=.3. Use critical values to test H0:u=3 versus Ha:u?3 using levels of significance a=.
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The accompanying table lists x = weights (in hundreds of pounds) and y = highway fuel usage rates (in mi/gal) for a sample of domestic new cars.
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