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400 people are chosen from a large population that is 50% women. How likely is it that the sample has only 180 women or fewer? What is the value of the test statistic z?
Describe the claim, the experiment, the test statistic, and clearly state the null and alternative hypotheses. In fact, the outline of a good response looks like this?
The standard deviation of the expenditure is $3. A simple random sample of 64 students is taken. What are the expected value, standard deviation, and shape of the sampling distribution of the sample mean?
At the 0.05 level of significance, is there evidence of a significant relationship between the age groups and where people primarily get their news? If so explain the relationship.
Using the z table in Table E of Appendix C, what are the critical values for a two-tailed test when a = 0.03 .
Distribution with a mean of 1 flaw per 5 feet of paper (0.2 flaws per foot). What is the probability that in a 1-foot roll there will be at least 2 flaws?
if tow televisions are randomly selected, compute the probability that both televisions work. what is the probability that at least one does not work?
An official of the Iowa Department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2 with a standard deviation of 1.114 months.
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each loation.
The Smoky Bear Trucking Company claims the average weight of a fully loaded moving van is 12,000 lb. The highway patrol decides to check this claim.
Probability that the entire batch will be rejected?
People with MBAs often get promoted faster than people without the degree. Prepare a 92% confidence interval estimate for the population proportion.
Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks such as problem solving ( Linde & Bergstroem, 1992).
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