Find the correlation coefficient
Given the following data set:
x
3
7
9
11
15
y
16
Using this to predict the value of y when x = 15.
Find the root-means square error of the regression line that predicts y from
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In Keno, there are 80 balls numbered from 1 to 80, and 20 are chosen at random. If you play a double number, you win if both numbers are chosen. This bet pays 11 to 1, and you have very close to a 6% chance of winning.
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Find the average and the SD for the list {11, 15, 9, 7, 3}. Using the average and SD you found, convert the values in the list to standard units. For each member of the list, state how many SDs it is above or below the average of the list. Without
Find the correlation coefficient. Using this to predict the value of y when x = 15. Find the root-means square error of the regression line that predicts y from
A professor measures the time X that students take to complete an examination, and the score Y that the students receive. The following measurements are obtained: X: time, Average time (X) = 30 SDx = 10 Y: scores, Average score (Y) = 70 SDy = 20
The percentage of values in some commonly used intervals are. 68.3% of the values of a normal random variable are within plus or minus one standard deviation of its mean.
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A previous study found a standard deviation of four hours. How many MRI machines must the company find data for in order to have a margin of error of at most 0.5 hours when calculating a 98% confidence interval?
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