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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?
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788.
a roll of plastic-coated wire has an average of 0.09 flaws per 5-meter length of wire. suppose a quality control
A fast food chain restaurant chain claims that lunch will be served within nine minutes of placing your order, or it is free. A sample of eight customers revealed the following waiting times in minutes:
What advantage does correlation have over a cross-tab?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
Is the transportation model the example of decision making under certainty or decision making under uncertainty? Provide the real-world example illustrtating why it is certainty or uncertainty.
Suppose today's sample yielded a mean of $4.19 and a standard deviation of $0.10, create and interpret a 99% confidence interval for the population standard deviation. Assume the distribution of gas prices in the area follows a normal distribution..
the null and alternative hypothesis are given. determine whether the hypothesis test is left-tailed right-tailed or
a shipment of 30 tires arrived at a tire shop this past weekend and unknown to the manager eight of the tires are
Any analysis required to check the required conditions (note that if you find that you cannot meet the required conditions for the test you expected to do, you must use the appropriate non-parametric test)
Give an ending for the below statement.Last week Tom had exams in Statistics and in English. He scored 10 points above the mean on both exams. From this information, you can conclude.
Define or give an example of a hypothetical construct. Explain why operational definitions are needed to define and to measure constructs.
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