Sample of domestic
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.
x=29,35,28,44,25,34,30,33,28,24,
y=31,27,29,25,31,29,28,28,28,33
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The Stars in a typical globular cluster orbit at speeds of around 10 km/s, and stars at the outskirts of a globular cluster are around 50 light-years from the center.
What assumption must hold to make statistical inferences about a population variance?
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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When a single person can yell at a level of 80 dB SPL, determine how many yelling people will it take to reach the intensity of 120 db SPL? (Intensity twice with two listeners triples with three listeners and so on).
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