If the sample variance for y1 = {-2, 7,9,13,16,0,15,6} is 44, what is the variance of y2 = 3.8 * y1? Two decimal places.

Describe the range of values for the correlation coefficient.

Explain the variance of the sum or difference of the two variables X and Y ?

The question is, for the following scores find the mean, median, sum of squared deviations, variance, and standard deviation. 2,2,0,5,1,4,1,3,0,,0,1,4,,4,0,1,,4,3,4,2,1,0. Tnank you!

how do you find the variance of the mean squared errors from this tabe

How do I use Excel to calculate the SAMPLE STD DEVIATION of a column?

Suppose the scatter diagram of a random sample of data pairs (x,y) shows no linear relationship between x and y. Do you expect the value of the sample correlation coefficient r to be close to 1, -1,or 0?

For her test grades, Gena has a mean = 65 and standard deviation = 25. Patti has a mean = 65 and standard deviation = 5.   For which of the students can you more accurately predict the next test score, and why? Consider the variability of scores.   Who is more likely to do either extremely well or extremely poorly on the next exam, and why?   Explain the reason for adjusting the formula of the standard deviation/variance with n - 1 in the denominator?

What effect does an outlier have on a correlation coefficient? Would it increase, decrease or stay the same?

A researchers says that 50% of the variance in blood pressure can be predicted from HR and that blood pressure is postively associated with HR. What is the correlation between blood pressure and HR?