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According to an IRS study, it takes a mean time of 270 minutes for taxpayers to prepare, copy and electronically transfer a 1040 tax form. The standard deviation of this distribution is 65 minutes. A consumer watchdog agency selects a random sample of 40 taxpayers for further study.
A. What is the shape, mean(expected value), and standard deviation of the sampling distribution of the sample mean for samples of size 40?
B. What is the probability that the sample mean is greater than 290 minutes?
C. What is the probability that the sample mean is more than 5 hours?
A doctoral student is designing a research study. She is hoping that the results of the study are statistically significant. What type of p-value would she want to obtain? Select one of the following.
1.a researcher wants to know if calcium is an effective treatment for lowering blood pressure. he assigns one randomly
Random sample of 40 November days (taken over many years)? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
If an apartment is selected at random, what is the probability that it is not a 2 bedroom apartment on the 2nd floor?
Find a 90% confidence interval for the mean amount left by all groups.
if two random samples of size 400 are drawn from two populations that have standard deviations of 60 and 8 respectively
Biggio's Department Store has six employees available to assign to four departments in the store: home furnishings, china, appliances, and jewelry.
Derive rules to test whether a number is divisible by N, where N ranges from 2 to 13. E.g. A number is divisible by 3 if the sum of the digits is divisible by 3.
What is meant by consistency and Draw a figure of the sampling distribution of a consistent estimator.
A normal distribution with a mean time of 2:00pm and a standard deviation of 15 minutes. What is the probability that the mail will arrive later than 2:30pm?
Test the hypothesis that the choice of the major by undergraduate students in this university is independent of their gender. Use α = 0.01.
A simple random sample of 60 voters will be drawn from this population. The chance the sample contains only Republicans and Democrats is?
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