Chapter 1
A population consists of all the subjects that are studied
A sample consists of a subset of the population
Create a frequency distribution for the following DATA: A,B,B,AB, O
O,O,B,AB,B
B,B,O,A,O
A,O,O,O,AB
AB,A,O,B,A
A:5
B:7
O:9
AB:4
What is the median in a set of DATA?
The middle number!
Find the sample space for the gender of the children if a family has three children. Use B for boy and G for girl.
BBB BBG BGB BGG GBB GBG GGB GGG
The sum of the probabilities of all events in a sample space add up to
1
What is the difference between inferential and descriptive statistics
Descriptive: Consists of collection, organization, summarization, and presentation of the DATA (like the census!!!) (what is actually there)
Inferential: Consists of generalizing from samples to populations (more like interpreting)
What do you call the smallest and largest numbers in a data set
lower and upper limits
What is the Mode
Any number that occurs more than once in a set of DATA (there can be more than 1 mode)
There are three basic interpretations of probability What are they????
Classical probability
Empirical probability
Subjective probability
What are the formulas for the probability mean, expectation and standard deviation
Show to leader
What are the two types of variables and what are their differences
Qualitative: Not numbers
Quantitative: Numbers
How do you find a class boundary?
Average the upper limit of one class and the lower class limit of the next class
What is the midrange:
The lowest value plus the highest divided by 2
In a sample of 50 people, 21 had type O blood, 22 had type A blood, 5 had type B blood, and 2 had type AB blood. Set up a frequency distribution and find the following probabilities.
A person has type O blood.
A:22
B:5
AB:2 P(O) = 21/50
O:21
Total:50
The expected value, or expectation, of a discrete random variable of a probability distribution, is the
theoretical average of the variable.
A researcher decides to collect and order 500 cats by color is he using qualitative or quantitative variables?
Qualitative 🐱
How do you find the range of a set of DATA?
High value - Low value
Find the Population Variance and Standard Deviation
(Show formula)
Two events are mutually exclusive events if.......?
they cannot occur at the same time (i.e., they have no outcomes in common)
One thousand tickets are sold at $1 each for four prizes of $100, $50, $25, and $10. After each prize drawing, the winning ticket is then returned to the pool of tickets. What is the expected value if you purchase two tickets?
-$1.63
What are the four levels of measurement (subcategories of qualitative and ordinal)
Nominal- names
Ordinal- names (can be ranked)
Interval- numbers (differences between units)
Ratio- Interval ( there is a true zero)
What are represented on the horizontal axis of a histogram
class boundaries
Find the sample variance and sample standard deviation
show on board
Determine which events are mutually exclusive and which are not, when a single die is rolled
.c. Getting an odd number and getting a number less than 4
Getting an odd number: 1, 3, or 5Getting a number less than 4: 1, 2, or 3Not Mutually Exclusive
In a binomial experiment, the probability of exactly X successes in n trials is
Show Formula