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A random sample of 10 items is drawn from a population whose standard deviation is unknown. The sample mean is 270 and the sample standart deviation is s=20. A) consturct a confidence interval for miu with 95% confidence. B) repeat part (a) assuming n=15 and n=30 C) describe how the confidence interval changes as n increases.
A doctor knows from experience that 20% of the patients to whom he gives a high blood pressure drug will have undesirable side effects. Assume the doctor gives that drug to ten of his patients
What is the minimum GPA that qualifies a student to graduate with honors and It has been decided by the Faculty Senate that all students with GPAs in the top 16% will graduate with honors
determine the sample size needed to construct a 90 confidence interval to estimate the population mean when ? 75 and
To check this theory, 20 invoices are randomly selected and 5 are found to have errors. What is the probability that of the 20 invoices written, five or more would contain errors if the theory is valid?
A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6. A raw score of 47 is associated with what percentile?
Political prisoners Mathew, Mark, and Luke are told that two of the three are to be executed. Matthew takes the jailer aside and says, "We both know that at least one of the others, Mark or Luke, will be executed
Make up a scatter diagram with 10 dots for each of the following situations: (a) perfect positive linear correlation, (b) large but not perfect positive linear correlation,
A Cornell university study of wage differentials between men and women reported that one of the reasons wages for men are higher than wages for women is that men tend to more years of work experience than women. Suppose the following results were ..
You had calculated the following measures of central tendency: the mean, the median, and the mean trimmed 25%. Which of these measures of central tendency will change when you correct the recording error?
A plus four 95% confidence interval for the difference between the two population proportions of wrist injuries is: A. 0.2909 ± 0.1674. B. 0.2909 ± 0.1069. C. 0.2909 ± 0.0907. D. 0.2909 ± 0.1275
Describe a 5-step hypothesis test of multiple means (using the one-factor or the two-factor ANOVA test process) for a particular claim related to your work or life environment.
Describe what happens when the sample standard deviations get larger and repeat Part a with samples of size 150.
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