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Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
(a) A 95% confidence interval for the difference between two means is reported as (0.8, 2.3). What can you conclude about the results of a significance test of the null hypothesis that the population means are equal versus the two-sided alternative?
(b) Will larger samples generally give a larger or a smaller margin of error for the difference between two sample means?
q1. if we have a sample size of 100 and the estimate of the population proportion is 0.10 the mean of the sampling
Here are the questions: Solve the differential equations by separation of variables.
Internet sites often vanish or move, so that references to them can't be followed. In fact, 13% of Internet sites referenced in papers in major scienti?c journals are lost within two years after publication.
Attended a religious service at least once a month, 20 stopped to help a person with car trouble. At the 0.05 significance level, test the claim that the two proportions are equal.
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds.
Explain the difference between the completely randomized design and the randomized block design. Discuss in the context of a gasoline refining process. Under what conditions would you prefer to use each design?
shorney construction company bids on projects assuming the mean idle time per worker is 72 or fewer minutes per day. a
You randomly select 40 can and carefully measure the contents. The sample mean of the cans is 127.9 ounces. Does the machine need to be reset?
if a and b are mutually exclusive events then pa or b equals...a. pa pb - pa and bb. pa pbc. pa pbd. paib pbiawhich
an irate student complained that the cost of textbooks was too high. he randomly surveyed 36 other students and found
Perform the indicated test of hypothesis. HO: M 7, given x= 0.01, N=25, Xbar = 7.019 and SD is =.1681. Assume the sample is selected from a normally distributed population.
There is much discussion in the press about several states moving to legalizing marijuana, either for only medical purposes, or more extremely, for recreational purposes. Looking only at the economic impact (not moral implications) of such changes..
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