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# Hypothesis Testing & Normal Probability

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The average monthly gasoline (gallon) purchase for a family with 2 cars is 62 gallons.This statistic has a normal distribution with a standard deviation = 6 gallons. A family is chosen at random.

a)Find the probability that the family's monthly gasoline (gallon) purchases will be between 47 and 67 gallons.
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For the following ststement , write the null hypothesis and the alternate hypothesis. Then, label the one that is the claim being made.
An internest service provider claims that the mean download speed is more than 100k.
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A manufacturer claims that the mean lifetime of it's florescent bulbs is 1050 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1030 hours with a standard deviation of 80 hours. Test the manufacturers claim. Use alpha = 0.08.