In a Simple Linear Regression Problem, the Following Statistics Are $$\sum ( x - \bar { x } ) ( y - \bar { y } )$$

question 165

Multiple Choice

In a simple linear regression problem, the following statistics are calculated from a sample of 10 observations: $$\sum ( x - \bar { x } ) ( y - \bar { y } )$$ = 2250, $$S _ { x }$$ = 10, $$\sum x$$ = 50, $$\sum y$$ = 75 The least squares estimates of the slope and y-intercept are respectively:

• A) 225 and -1117.5.
• B) 2.5 and -5.
• C) 25 and-117.5.
• D) 25 and 117.5.

---

Definitions:

Tidal Volume (TV)

The volume of air inhaled or exhaled during a normal breath.

Maximal Exhalation

The act of expelling as much air as possible from the lungs, used to measure lung capacity and function.

Normal Breath

The typical process of inhaling and exhaling air in a healthy individual without any respiratory conditions.

Blood H+ Levels

The concentration of hydrogen ions in the blood, which determines blood pH and is crucial for maintaining acid-base balance in the body.