Probability
3 out of 8 people get into college. What's the percentage of people who get into college?
37.5%
What's the mean of: 3, 12, 15, 19, 20, 67, 87, 26?
31.125
The entire state of New York got covid?
Population
What's a histogram
A graphical method to summarize discrete or continuous data that are measured on an interval scale. Also frequency distribution chart.
What starts high and ends low
positively skewed
What's the probability of a coin flips twice flip land on heads twice?
25%
What's the range of 89, 26, 90, 56, 27, 11, 9, 68, 24
81
10 students from KU business school were brought in to ask what was their favorite course
Sample
What's a mean?
The average of data taken.
Startss low but has a peak towards the end
Negatively Skewed
The probability of rolling a 4 on a six-sided die.
16.67%
What's the median of 87, 65, 13, 48, 972, 269, 28
65
A business asks all of it's employees to get a parking pass. What are those employees?
What does continuous variable mean?
variable that can take any value within a range — including decimals and fractions. Kinda of like measuring something.
Ex: Time, Height, money spent.
Histrogram with two peak points
Bimodal
What's the chances you roll two dice six sided dices and get even numbers on both
25%
what's the sample variance of 5, 3, 7, 10
8.92
A marketing firm surveys 500 shoppers from Walmart to estimate what all Walmart shoppers think. That group of 500 is a?
Sample
What does discrete mean
type of variable that can only take specific, separate values — usually whole numbers.
Ex: Number of cars in a parking lot.
Has one peak point
Unimodal
An NBA player makes 8/10 free throws. How many free throws would he make if he shot 84?
67.2 free throws
what's the standard deviation of 11, 34, 25, 43
13.64
United states government surveys the states in the midwest asking what their favorite food is?
Sample
Types of Variables (2)
Categorical and Numerical
Equal on both halves
Symmetric