A
It is a part of the population.
Sample
Find the area that matches below z= -0.89
0.1867
Less than a negative: Look up the area in the table and subtract from 0.5
Name the 2 types of numerical or quantitative variables.
Discrete and Continuous
Find the area that matches to z = 2.43
0.4925
The sum of the probabilities of all values of the random variable must be ________
equal to 1
Find the area that matches below z= 2.36
0.9909
Below a positive z score: Area + 0.50
The probability of each value of the random variable must be _____________
between or equal to 0 and 1
Find the area under the standard normal distribution curve between 0.56 to 2
0.0366
Between two positives: Look up both areas in the table and subtract the smaller from the larger.
Give 2 categorical or qualitative variables.
Nominal, Ordinal, Binary or Ratio
Find the area under the standard normal distribution curve between -2.03 to -0.65
0.2367
Between two negative: Look up both areas in the table and subtract the smaller from the larger.
Consider a deck of cards. Supposed that you draw 1 card, what is the probability that the card that you will pick is a face card?
- A deck of cards consists of 52 cards.
- 3 types of face cards: Jack, Queen, and King
- Each face cards consists of: Heart, Spade, Clover, and Diamond
- Formula for probability:
number of the desired outcome
P = _________________________
total number of outcomes
Answer: 12/52 or 3/13
Find the area that matches to z= 1.25
0.3944
It refers to every member of the group.
Population
Find the area that matches below z= 1.96
0.9750
Below a positive z score: Area + 0.50
It consists of the values of the random variable can assume and the corresponding probabilities of the values.
Discrete Probability Distribution or the Probability Mass Function
Find the area under the standard normal distribution curve between -0.72 to 1.43
0.6878
Between a negative and a positive: Add area together
These are variables that have values that represent a counted measure quantity.
Numerical or Quantitative Variable
Find the area under the standard normal distribution curve between -0.43 to -1.65
0.2841
Between two negative: Look up both areas in the table and subtract the smaller from the larger.
It is a continuous probability distribution wherein values lie in a symmetrical fashion mostly situated around the mean.
Normal Distribution
Find the area under the standard normal distribution curve between 1 to 1.25
0.0530
etween two positives: Look up both areas in the table and subtract the smaller from the larger.
It is a variable whose values are determined by chance.
Random Variable
Find the area under the standard normal distribution curve between -2.54 to 0.54.
0.6999
Between a negative and a positive: Add area together
It tells you what percentage of your data falls within a certain number of standard deviations from the mean.
Empirical Rule
Find the area under the standard normal distribution curve to the right of 0.23
0.4090
Greater than a positive: Look up the area in the table and subtract from 0.5
These are variables that take category as their values.