independent variables. SUMMARY OUTPUT Regression Statistics Multiple R 0.857 0.734 R Square Adjusted R Square 0.703 Standard Error 5.366 Observations 20 ANOVA Significance F 23.46 df SS MS 2 1350.76 675.38 0.00 Regression Residual 17 489.44 28.79 Total 19 1840.20 Coefficients Standard Error t Stat P-value 0.00 Upper 95% 61.73 Lower 95% Intercept 67.67 2.82 24.03 73.61 hours 5.56 0.90 6.18 0.00 3.66 7.45 prep exams -0.60 0.91 -0.66 0.52 -2.53 1.33 a. What is the value of r2? What is the practical meaning of this val b. What is the coefficient of Hours? Interpret this value D QUARTER, SY2021-2022 GED 102

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...