Mid-term exam (unit 1-3) Flashcards
What is a Venn diagram?
It’s a box like diagram with all possible outcomes of an experiment

What is an Experiment?
a process that results in one (only) of many observations
What is an Outcome?
observations of the experiment
What is a Sample space?
all the potential outcomes of the experiment
What is a Simple event?
includes only one of the final outcomes
What is a Compound events?
consist of more than one outcome (ex.: at most one man is selected - therefore multiple outcomes)
What is a Population?
consists of all elements being studied in statistics
What is a Sample?
A portion of the population selected for study
What is a Representative Sample?
Sample that represents characteristics of the population
What is a Random sample?
Random selection of the population so each element of the population has a chance of being selected
What is a Sampling with replacement?
elements are put back into the population - therefore contains the same number of items each time a selection is made
What is a Sampling without replacement?
not put back into the population
What is a Census?
A survey that includes every member of the population
What is a Quantitative variable?
a variable that can be measured numerically (ex.: incomes, height, number of houses)
What is a Qualitative variable?
Non-numerical variable (ex.: gender, hair color)
What is a Discrete variable?
Variable whose values are countable (ex.: 0, 1, 2, 3… but not in between intervals like in between 0 to 2)
What is a Continuous variable?
Variable that aren’t countable and has a value over a certain interval (ex.: time, weight…between 30 and 60 minutes)
What is a Frequency distribution for qualitative data?
Frequency distribution for qualitative data lists all categories and the number of elements that belong to each of the categories
How do you calculate midpoint of a class?
(upper limit + lower limit)/2
What is a Frequency distribution for quantitative data?
Frequency distribution for quantitative data lists all the classes and the number of values that belong to each class. It is called grouped data.
What is a Class boundery?
is the midpoint of the upper limit and the lower limit of the next class. (ex.: Class limits 401 to 600 would be 400.5 to less than 600.5)
How do you calculate class width?
(Largest value - Smallest value)/number of class
What is a Right Skewed histogram?
The curve is longer on the right of the histogram
What is a Left Skewed histogram?
The curve is longer on the left of the histogram