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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.
Data were collected on a quantitative measure with a subgroup size of three observations. Thirty subgroups were collected, with the following results.
Is there sufficient evidence to indicate that the new quality control standards were effective in reducing the proportion of defective digital music players?
CI Using data from NHANES, we looked at the pulse rate for nearly 800 people to see whether it is plausible that men and women have the same population mean.
1. Out-of-state tuition and fees at the top graduate schools of business can be very expensive, but the starting salary and bonus paid to graduates from many
A random sample of 200 students at UCLA shows that 120 of them have internet access. Test the claim that the true population proportion of students at UCLA who have internet access
For a simple random sample of n = 4 welds, what is the probability that the sample mean will be at least 10,200 pounds per square inch? Less than 9900 pounds per square inch?
What is the probability of at least three hacker attempts during a month? What is the probability of a hacker attempt occurring every 15 days or less (assume a 30 day month).
Using the appropriate statistical table, what is the most accurate statement that can be made about the p-value for the test?
(a) Find a 90% confidence interval (CI) for p, the probability of success at each trial. (b) Find a 98% CI for p.
For the in parts A through E, choose the highest level of measurement (or cannot be determine).
10% of the north district students failed, 15% of the south district students failed, and 5% of the central district students failed. Develop a joint probability table.
What is the probability that a roll of tape 1200 Ceet long contains no defects?
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