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A coffee shop claims that its fresh-brewed drinks have a mean caffeine content of 80 milligrams per five ounces. You work for a city health agency and are asked to test this claim. You find that a random sample of 42 five-ounce servings has a mean caffeine content of 83 milligrams and a standard deviation of 7.5 milligrams. At = 0.05, do the evidence suggest that the mean caffeine content is in fact different than 80 milligrams per five ounces?
Your answer must include: i) null and alternative hypotheses; ii) statement of assumptions; iii) calculation of the test statistic; iv) calculation of the P-value;v) decision in terms of the null hypothesis; and vi) conclusion in the context of the problem.
There are 2,000 eligible voters in a precinct. A total of 500 voters are randomly selected and asked whether they plan to vote for the Democratic incumbent or the Republican challenger. Of the 500 surveyed, 350 said they would vote for the Democra..
Conduct a test for independence of the two categorical variables. Use a = 0.05. State your conclusion.
What proportion of a normal distribution is within one standard deviation of the mean?
Determine whether there is a difference in the mean weights of candies of different colors. Use the .05 significance level.
What is the upper bound for the 90% confidence interval for the proportion of water specimens that contain detectable levels of lead
question your job as marketing manager of a large chain is to watch the overall market situation in many districts. the
consider the experiments first draw a poisson random variable n with parameter ?. then perform n independent bernoulli
If a sample of 30 people selected from 300, find the probability that the mean will be less than 156 pounds using the correction factor.
According to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
A certain genetic characteristic of a particular plant can appear in one of three forms (phenotypes). A researcher has developed a theory
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
you want to know if theres an association between college students spring breakdestinations and what year theyre in.
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