Key in: Display :
Mean: (2nd F) I x I 53.89
Standard Deviation: (2nd F) 1 Sx 1 9.28
Variance: BE) f~=1 86.12
Correct Data (CD): The last entry above is an error and must be changed to 60 x 2.
Key in:
65 B H 2 E E
60 S D 2 (Data)
Display :
7
9
3. Two-Variable Statistics and Linear Regression.
In addition to the same statistical functions for Y as for X in single-variable statistics, the sum of the
products of samples 2 X Y is added in two-variable statistics.
In Linear Regression there are three important values; r, a, and b. The correlation coefficient r shows the
relationship between two variables for a particular sample. The value of r is between —1 and 1. If r
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