Chapter 6.1 and 6.2
Properties Of A Normal Curve
- he curve is bell-shaped.
- The curve is symmetrical about a vertical line through (U).
- The curve approaches the horizontal axis but never touches or crosses it.
- The inflection (transition) points between cupping upward and downward occur above (U) - (O).
- The area under the entire curve is 1.
M & O
Out Of Control Signals
Three of the most common warning signs are:
A standard deviation score close to zero tells us the measurement is near the mean of the distribution.
A positive standard score tells us the measurement is above the mean.
A negative standard score tells us the measurement is below the mean.