Aleast squares regression line was created to predict the exam 3 score of sta 2023 students based on their exam 1 score. the study found that the value of r-squared was 28.8% and the least squares regression line was yhat=50.57+0.4845x. what is the correlation coefficient, r? a. 0.54b. -0.54c. 5.37d. -5.37e. 0.08f. -0.08

a) 0.54

Step-by-step explanation:

The correlation coefficient can be found by taking square root of R-squared value and the sign of correlation coefficient can be assessed by considering the sign of slope value. So,

r²=28.8%=28.8/100=0.288

r===0.5367

By rounding to two decimal places the correlation coefficient

r=0.54

We can see that slope=0.4845 has positive sign so, the correlation coefficient contains the positive sign.

Hence the correlation coefficient r=0.54.

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

answer: idk

step-by-step explanation: