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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?
Hello, can you please help me solve this inequality with absolute values?
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Does the 99% confidence interval contain the actual population mean? If not, explain why not. What proportion of many similarly constructed confidence intervals should include the true population mean value?
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When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
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If you select a random sample of 200 children and observe the number of diagnostic services each of them receives, what is the probability that the mean number of diagnostic services is more than 1.72?
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