Regression
Linear regression is modeled by this equation.
y = m*x + b
A ________ graph is a good type of graph for representing qualitative data using relative heights of spaced out bars.
Bar graph
[5, 7, 6, 5, 6, 6, 7, 4, 7, 8, 6, 5, 6, 6]
What is the mode?
6
Define mode
The most frequently occurring value in the data set.
Describe how to find arithmetic mean.
Sum of all values, divided by how many pieces of data were summed.
Come to the board and draw a line with negative slope.
(Line slopes downward, with the dependent variable decreasing as the independent variable increases)
A __________ chart shows data using relative sizes of different slices of a circular graph.
Pie chart
When finding standard deviation of a population, you divide by _____. For a sample, you divide by _____.
N, N-1
How do you find range?
Highest piece of data - lowest piece of data
_________ data is measured, while ___________ data is observed.
Quantitative, Qualitative
What is the slope formula (when using the 2 point method)?
(Y2-Y1)/(X2-X1)
or change in y divided by change in x
Bar Graphs are good when your data is in categories, but when you have continuous qualitative data, it is better to use a ____________.
Histogram.
Variance = ____________ squared
Standard deviation
What is z-score?
Number of standard deviations away from the mean
In a normal distribution, what percent of the data is withing 2 standard deviations of the mean?
95%
The least square method calculates line of best fit by minimizing the_____________ of each data point away from the calculated line.
Squared distance
The graph that models the normal distribution is called the ________ curve.
Bell curve
Find the geometric mean of 250 and 6.
38.7
When finding standard deviation, why do we square the distance to the mean?
To eliminate negatives
Interpolation predicts values within the range of the data. Extrapolation predicts values outside of it.
What is the equation of a line between the points (124.531, 1) and (45235.40592, 1)?
y = 1
What are the 5 numbers you need to create a box and whisker plot?
Minimum, 1st Quartile, Median, 3rd Quartile, Maximum
[210, 207, 207, 206, 208, 209, 208, 209, 207, 207, 210]
Find the median
208
[20, 30, 10, 50, 30, 20, 1000]
Find the arithmetic mean
165.71
The Mean of a data set is 38.8, and the Standard Deviation is 11.4. How many standard deviations from the mean is 26?
-1.12