Math Section2 Flashcards
Mean, median, and mode are all measures of what?
central tendency
What is a measure of central tendency?
a value that is the central position of a data set
What is mean?
the average of a set of numbers
How do you calculate mean?
add the numbers in a data set and divide it by the number of numbers in the data set
What is median?
the middle number in a data set written from least to greatest
How do you find the median of a data set with no single middle value?
average the 2 middle numbers together
What is mode?
the number that appears most often in a data set
What are the modes a data set can have?
no mode, one mode, or more than one mode
What is range?
the difference between the largest and smallest numbers in a data set
What is an outlier?
a value that is extreme, meaning it is much smaller or larger than the other numbers
What type of data display allows us to summarize the shape of a data set?
a stem-and-leaf plot
How is the data in a stem-and-leaf plot arranged?
by place value
What are the stems in a stem-and-leaf plot?
the digits in the tens place, found on the left of the vertical line
What are the leaves in a stem-and-leaf plot?
the digits in the ones place, found on the right of the vertical line
What are frequency diagrams?
a number line marked with possible values or a range of values, with points indicating each value
What do box-and-whisker plots organize data based on?
range and quartiles
In a box-and-whisker plot, what does the left whisker represent?
the distance between the minimum value and the lower quartile
In a box-and-whisker plot, what does the right whisker represent?
the distance between the max value and the upper quartile
What represents the median in a box-and-whisker plot?
a vertical line
What is the lower extreme in a data set?
the smallest number
What is the upper extreme in a data set?
the largest number
What is another term for lower quartile?
Q1
What is another term for upper quartile?
Q3
What is the lower quartile?
the median of the lower half of the data set (between the lower extreme and median)
What is the upper quartile?
the median of the upper half of the data set (between the upper extreme and median)
What does IQR stand for?
Interquartile Range
What is IQR?
the difference between the lower and upper quartiles
What is the formula to find the IQR?
IQR = Q3 - Q1
What are bar graphs?
visual displays used to compare frequency or other aspects
How many axes are in a bar graph?
2, the y-axis and x-axis
What is a group data axis?
the axis at the base of the bars, based on the range of the data
What is a frequency axis?
the axis that displays the frequency, found on the left/right
What are scatterplots?
diagrams that show the relationship and correlation between sets of data
What are the 3 types of correlation?
positive, negative, and none
What is positive correlation?
as x increases, y increases
What is negative correlation?
a x increases, y decreases
What is no correlation?
when there is no pattern between x and y
What is a line of best fit?
a line that shows the overall trend of the data set
What is an arithmetic sequence?
a sequence when the numbers are added/subtracted to get the next number in the sequence
What is a geometric sequence?
a sequence when the numbers are multiplied/divided to get the next number in the sequence
