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1. A random sample of 16 size D batteries for cars yield a mean of 2.8 hours with standard deviation, 1.3 hours.
(a) Find the critical value, t*, for a 99% CI. t* =
(b) Find the margin of error for a 99% CI.
2. Dave thinks a certain potato chip maker is putting fewer chips in their regular bags of chips. From a random sample of 23 bags of potato chips he calculated a P value of 0.141 for the sample.
(a) At a 5% level of significance, is there evidence that Dave is correct?
(b) At a 10% level of significance, is there evidence that he is correct?
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In a normal distribution
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The mean television viewing time for teens is 3 hours per day. Assume the population mean is 3 and the population standard deviation is known to be 1.2 hours.
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