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What information is provided by the sign (= or -) of the Pearson correlation?
What information is provided by numerical value of the Pearson correlation?
What is the major distinction between the Pearson and Spearman correlations?
A professor obtains SAT scores and freshman grade point averages (GPAs) for a group of n=15 college students. The students scores have a mean of m=580 with SS=22,400, and the GPAs have a mean of 3.10 with SS=1.26, and SP=84.
a. Find regression equation for predicting GPA from SAT scores.
It has been estimated that 30% of all farms are family-owned. In a sample of 12 farms, what is the probability that exactly three farms are family owned?
What is critical z-value which corresponds to confidence level of 88%.
Be sure to show whether you use the t- or z- value, and what value you use. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the "t" or the "z".
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.500 inches.
To give 98% confidence interval for population mean μ, you would use critical value.
Testing for Population mean - determine if there has been a significant change in the population mean.
It is estimated that 2% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 95% accurate. What is the probability that an athlete who tests positive is actually a user?
A social psychologist reports that "in our sample, ethnocentrism was significantly higher (P
In 1,000 samples, assuming that H 0 is true, how many times would you expect to commit Type I error if:
Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.
This problem has to do with graphical plotting and computation for certain distribution. Please mention a detailed response to the questions listed with appropriate graphical and statistical data representation(s).
We suspect that automobile insurance premiums (in dollars) may be steadily decreasing with the driver's driving experience (in years), so we choose a random sample of drivers who have similar automobile insurance coverage and collect data about th..
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