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According to a study, it takes an average of 330 minutes for taxpayers to prepare, copy, and mail an income tax return. A consumer watchdog agency selects a random sample of 40 taxpayers and finds the standard deviation of the time to prepare, copy and mail their tax return is 80 minutes.
a. What is the standard error of the mean in this example?b. What is the likelihood the sample mean is greater than 320 minutes?c. What is the likelihood the sample mean is between 320 and 350 minutes?d. What is the likelihood the sample mean is greater than 350 minutes?e. What assumption or assumptions do you need to make about the shape of the population?
For a population containing N=902 individuals, what code number would you assign for:
If you select a random sample of 100 voters, what is the probability that a candidate will be forecast as the winner when. The true percentage of her vote is 50.1%?
Find the probability that an individual graduate will have a salary over $45,000. A group of nine graduates will have a group average over $45,000.
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test.
Describe how the three interval estimates will be related to each other. Which of the three intervals is most likely to contain the population mean?
Smith Software Inc. is a computer software firm that has grown in size in recent years. To assist in its planning for future growth, you are to determine the trend of the number of accounts based upon the below.
Find the discrete probability distribution for the random variable X and compute the corresponding mean and standard deviation.
Find the probability (type answer as an integer or simplified fraction) of a couple having a baby boy when their fifth child is born, given that the first four children were all boys.
If the amounts of the electric bills are normally distributed, find the probability that the mean of the bill for 15 residents will be less than 75 dollars.
Give three logically possible directions of casualty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
The average age of the evening students is significantly different from 21. Use a 0.01 level of significance."Compute the test statistic for the test stated in the problem"
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