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It is known that 15% of all homeowners pay a monthly mortgage of more than $1800 and that the standard deviation of the monthly mortgage payments of all homeowners is $278. Suppose that the mortgage payments of all homeowners have a normal distribution. What is the mean monthly mortgage paid by all homeowner?
A random sample of 16 students selected from the student body of a large university had an average age of 25 years and a standard deviation of 2 years.
Generate three random observations from the uniform distribution between -10 and 40 by using the following random numbers:
A 2007 study reported in Science magazine stated that fifth-grade teachers scored a mean of 3.4 (out of 7) points for "providing evaluative feedback to students on their work." Assume that the sample size was 36 and the sample standard deviation w..
Assume the population proportion is 0.17 and a simple random sample of 850 households will be selected from the population. What is the probability that the sample proportion will be within ±0.02 of the population proportion?
Illustrate how you could use the interrupted time series design to naswer a real world research question through the use of archival data.
A computer password consists of four characters. The characters can be one of the 26 letters of the alphabet. Each character may be used more than once.
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
Find the standard error of the difference in sample means,
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
If you want to be 95% confident of estimating the population proportion to within a sample error of +and - .05 and there is historical evidence that the population is approximately .35, what sample size is needed.
Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs.
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