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What pattern would appear in a graph of a Pearson correlation of r = -0.80?
A. Points tightly clustered around a line that slopes up to the right.
B Points tightly clustered around a line that slopes down to the right
C.Points widely scattered around a line that slopes up to the right.
D.Points widely scattered around a line that slopes down to the right.
Explain the purpose of the critical value in a hypothesis test, how do you find the critical value and what purpose does it play?
students enrolled in an introductory statistics course at a university were asked to take a survey that indicated
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
broke amp down has several hundred machines in its large manufacturing facility as it uses the pwp concept
What is the probability she received 5 or more email during the same period?
q1. in testing the difference between two population means using two independent samples we use thepooled variance in
A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 4. The sample mean is 23. (Round your answers to 3 decimal places.) (a) The standard error of the mean is_____?
Define validity and reliability. How can we insure our data is both reliable and valid? Which of these two do you think is the more important?
A random check of 81 records of inmates from all federal prisons found the confidence interval for mean prison terms per prisoner to be 2.113 years to 2.287 years.
In a randomized clinical trial of timolol vs. placebo in patients surviving acute myocardial infarction, the total deaths at an average of 24 months after treatment were found to be 65 out of 720 in the Timolol group and 112 out of 860 in the plac..
If the standard deviation is 4.09, how large a sample is needed to get the desired information to be accurate within 0.53 decibels? Show all work.
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
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