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Four statistics students discuss the following design questions; who has the best answer about type of sample that should be taken? "Researchers want to survey teenagers to see if there is a link between how often they eat dinner with the family and how welladjusted they are. If the researchers suspect that gender may play an important role in this relationship, should they take a convenience sample, a systematic sample, a cluster sample, or a stratified sample?" Adam: Convenience sample sounds good. If they take it in a convenient way, they can use a larger sample size. That will include lots of both sexes. Brittany: They should stratify the population into males and females, then take random samples, keeping track of gender along with the other variable. Carlos: Isn't that a systematic sample? You systematically pick one male, then one female, then another male, and another female, and so on. Dominique: If you want enough of both sexes, I think you should sample a cluster of males and a cluster of females, making the clusters as large as possible.
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
suppose that 4 of the 2 million high school students who take the sat each year receive special accommodations because
At the 10% level of significance, does the following sample evidence indicate that the two population means are equal? Assume the populations are normally distributed.
The sample has a mean of 598.8 ml and a standard deviation of 3.0 ml. What is the value of the test statistic for testing the appropriate test of significance?
A random sample of 25 observations produced a sample mean of 41.8. Using a = .025, would you reject the null hypothesis?
A random sample of 60 healthy residents has a mean chloride level of 98 mEq/L. If it isknown that the chloride levels in healthy individuals residing inFlorida have a standard deviation of 40 mEq/L, find a 90% confidence intervalfor the true mean ..
a distribution center receives shipments of a product from three different factories in the quantities of 60 30 and
Find out the area using Normal distribution. As, if Z is a standard normal variable find out the probability that Z lies.
the american veterinary association claims that the annual cost of medical care for dogs averages 100 with a standard
in the senior year of a high school graduating class of 100 students 42 studied mathematics 68 studied psychology 54
The central district students failed. Develop a probability tree showing all marginal, conditional and joint probabilities. Develop a joint probability table.
a machine that cuts corks for wine bottles operates in such a way that the distribution of the diameter of the corks
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