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Four statistics students are answering a homework problem that asks them to explain why a very large sample of college students shows a significantly higher percentage of students with pierced ears than does a sample of high school students. Which two answers are best?
Adam: Probably because of people like me-I didn't get my ear pierced until I started college. Once you have them pierced, you don't get them unpierced, so the number with pierced ears accumulates as students get older.
Brittany: I think it's because high school students are pretty much evenly divided between males and females, but there are more females in college and they tend to be the ones with pierced ears. Carlos: Maybe it's because the college students feel less inhibited, so they're the ones who are willing to admit that they have pierced ears. Dominique: Inhibitions have nothing to do with it unless you're talking about something more personal like a hidden tattoo. I think the difference in proportions with ears pierced just came about by chance. Anything's possible with random samples.
a. What is the average vehicle size assuming each vehicle is filled to capacity?
The length of time sixth graders watch television each day is normally distributed with a mean = 118.3 minutes and standard deviation = 43.1 minutes. Use this information to answer the following:
Blood tests showed a sample mean of 8.1 pH with sample standard deviation s = 0.6 pH. Use a 5% level of significance to test the claim that the drug has changed (either way) the mean pH of the blood.
If you just had to predict the first digit of X100, what digit should you choose to maximize your chance of being correct, and what is that chance?
Find the value of W, the test statistic for a two sample rank-sum test that would compare the two methods for losing weight. Give the details of how you found W. Please show your step-by-step hand calculation here.
Give the measurement you obtained to the instructor; he or she will provide you with the set of measurements for the class.
a major u.s. tire maker wants to review its warranty for their rainmaker tire. the warranty covers at most 40000 miles.
Provide at least five real life examples where legislation and daily life choices have been driven by what could be defined basically as rooted in statistical correlations and regression analyses.
What are the theoretical parameters for the sampling distribution based on these 40 trains? Assume you are dealing with an infinite population of trains.
the route used by a certain motorist in commuting to work contains two intersections with traffic signals. the
A single plant operates three galvanizing lines that are assumed to operate independently. What is the probability that none of the lines experiences a surface finish problem in 40 hours of operation.
Determine the following probabilities: Events A and B are mutually exclusive events defined on common sample space.
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