Flashcards in Numerical summaries (mean, median, variance, sd, IQR). Bivariate data: correlation, two-way tables Deck (11)
Average of all data points.
Add all numbers together then divide by the total number of numbers.
The centre number in the ordered sequence of data points.
The number that occurs the most in a data set.
Standard deviation σ
How measures are spread out from the mean.
Low σ means numbers are close to the mean
High σ means numbers are spread out from the mean.
Distance each number is from the mean.
Difference between highest and lowest values.
max - min = range
Inter quartile range
Middle 50% of the data.
Q3 - Q1 = IQR
Correlation coefficient r
r = -1 : as y decreases, x increases - negative linear
r = 0 : no linear model - no association
r = 1 : as x increases so does y - positive linear
How to best represent data for 1 qualitative and 1 quantitative variable?
How to best represent data for 2 quantitative variables?