probability distribution class notes

Question 1

probability dist function is discrete or continuous

Answer 1

discrete

Question 2

probability density function is discrete or continuous

Answer 2

continuous

Question 3

discrete vs continuous

Answer 3

Discrete data represents exact figures you can count, such as the numbers of students in a class. In contrast, continuous data often includes measurable values representing a range of information, such as the extent of the difference between the shortest and tallest student in a class.

Question 4

cumulative density function

Answer 4

values below a certain threshold

Question 5

what does cumulative density function tell us

Answer 5

tell us compliments so can learn more about above threshold

Question 6

normal distribution

Answer 6

-appears as bell curve
-perfect symmetric, no skewness
-mean, median and mode are all equal and at the same point

Question 7

what do you do when you are trying to find area between two z scores

Answer 7

find areas left to both z then subtract smaller number from larger one

Question 8

z scores give

Answer 8

relative location of every point out of entire distribution

Question 9

if z is positive number then

Answer 9

above the mean

Question 10

if z = 0 then

Answer 10

= to the mean

Question 11

empirical rule for normal dist

Answer 11

-68% 1 SD from mean
-95% 2 steps
-99% 3 steps