Normal population with a mean
A random sample of n=25 scores is selected from a normal population with a mean of 20, and a treatment is administered to each individual in the sample. After the treatment, the sample mean is found to be M = 22.2 with SS =384.
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An investment offers a 11.0 percent total return over the coming year. Bill Bernanke thinks the total real return on this investment will be only 3.5 percent. What does Bill believe the inflation rate will be over the next year?
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A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 34,000 miles and a standard deviation od 2400 miles. He wants to give a guarantee for free replacement of tires that don't wea
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