Stats 10
Home > Flashcards > Print Preview
The flashcards below were created by user
camturnbull
on
FreezingBlue Flashcards. What would you like to do?

What is the normal distribution?
 A family of curves, each defined by the standard deviation and mean (σ+µ)
 The differences are measured as standard deviations

Why do the measures of central tendency all have the same value on the normal distribution?
 It is symmetrical, no matter the parameters, the normal distribution preserves its perfect bell shape
 Different variances make it wider, different means make it shift in their direction

What is the standard normal distribution?
 A type of standard distribution curve with a mean of 0
 Values on this curve are known as z scores

What is suggested by the central limit theorem?
Many naturally occurring variables will tend to fall close to the normal distribution

How might one use a normal distribution curve to find the probability of an eventuality over a specific point?
Draw a vertical line on the curve at the point

Give the equation for converting a normal score into a z score
 This is the same formula for generating standard scores

What are scores to the right and to the left of the z score referred to as?
 P(z) for right
 1P(z) for left

How might one find the area between two values?
 Find the score for the highest value given
 Find the score for the lowest value given
 Minus one by the other
 Eg:
 P(z<+.67)=.749
 P(z< .67)=.251
 P(.67<z<+.67)=.749.251=.498