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Dr. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a population standard devation of 2.44 words per essay. For her 10 A.M. Section of 40students, the mean number of misspelled words was 6.05. Construct a 95 percent confidence interval for the mean number of misspelled words in the population of student essays.
What sample size should be chosen so that there is 0.95 probability of estimating the mean monthly income in $150 or less?
Can you conclude that the information in the article is untrue? Use the 0.05 significance level. Determine the p-value and explain its meaning.
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
Calculate a 99% confidence interval for the true mean difference between pretreatment and after treatment testosterone levels of young male TBI patients.
Assume the population standard deviation is 1.2 hours. The standard error of the mean is:
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
From Group of 40 People, a jury of 12 people is selected. In how many various ways can a jury of 12 people be selected?
Find out the best predicted household size given that the household discards 5.00 lb of plastic.
In a regression analysis, three independent variables are used in the equation based on a sample of forty observations. What are the degrees of freedom associated with the F-statistic?
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
To select a _________ sample, an intact group of subjects that represent the population is selected.
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