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An English professor is attempting to estimate the mean number of novels that the student body reads during their time in college. He is conducting an exit survey with seniors. He hopes to have a margin of error of 2 books with 99?% confidence. From reading previous?studies, he expects a large standard deviation and is going to assume it is 5. How many students should he? survey?
He should survey at least ___ students. (Round up to the nearest whole number.)
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude about the sample distribution? Explain.
According to the 1990 U.S. Census, about 80% of men aged 20 to 24 have never been married. In a random sample of 40 men aged 20 to 24, how many unmarried men.
two accounting professors decided to compare the variance of their grading procedures. to accomplish this they each
Compute a Pearson's correlation coefficient for these data and determine whether the correlation is significant.
Failure times for a randomly failing component are 3.3, 14.3, 27.1, 41.3, and 92.2 hours. Find the MTTF and standard deviation using: a) moment estimation. b) maximum likelihood estimation.
the consumption of two types of manufacturing goods x and y follows a hypothetical joint probability density function
A study was conducted with alpha = 0.05 to determine if there is a significant linear correlation between the number of credit hours earned at the time of taking statistics 101 and the grade in the course. Eight pairs of data were collected.
A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean numbe..
Further discussion of the birthday problem without the assumption of a uniform distribution of birthdays can be found in [Ber80].
When we perform an experiment, event A occurs with probability P[A] = 0.01. In this problem, we estimate P[A] using (A), the relative frequency of A over n independent trials
Compare available records of the divorce rates of each Emirate based on the statistics provided by the Civil Registry or Court. Choose a sample of divorce couples , and float a questionnaire to find out the reasons why they divorced
The sponsor of the survey wants you to use the 95 percent confidence level. The estimate is to be within $100. How many families should be interviewed?
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