STATS 101 NOTES & FORMULAS QUIZZES
WITH REVIEWED DETAILED ACCURATE
ANSWERS
Y = Mx + C
M = gradient is how steep the line is
Y = where it crosses
C = is the Y intercept
change in Y / change in x = gradient
(think of the YMCA song) - answer ✔✔-Equation of a straight line
the number occurring the most - answer ✔✔-Mode
add together / number of data sets
sample mean = x bar
population mean = mu symbol - answer ✔✔-Calculating a mean
the middle - answer ✔✔-Calculating a median
difference between the lowest and the highest
max value - min value = range
, it's the easiest to find but not so good to use as it only uses two of your data values, doesn't take into
account all the values - answer ✔✔-Calculating the Range
Measure of spread
How far apart the numbers are in a data set is from the mean
population = sigma
sample = s
Add up differences / number of differences (same as calculating a mean) - answer ✔✔-Standard
deviation
take the number given of the subset and calculate the mean of that set - then do this for each number
moving down by one - answer ✔✔-Calculating a moving mean
middle of the bottom half after finding the median - answer ✔✔-Lower quartile
middle of the top half after finding the median - answer ✔✔-Upper quartile
Q = 1/2 (n + 1) th term - answer ✔✔-Finding quartiles on stem & leaf
The average squared distance to the mean - answer ✔✔-Variance
1. Linearity
2. Independence of errors/residuals
3. Normality of error/residuals
4. Equal variance - answer ✔✔-Assumptions of Regression
[LINE]
aka error
WITH REVIEWED DETAILED ACCURATE
ANSWERS
Y = Mx + C
M = gradient is how steep the line is
Y = where it crosses
C = is the Y intercept
change in Y / change in x = gradient
(think of the YMCA song) - answer ✔✔-Equation of a straight line
the number occurring the most - answer ✔✔-Mode
add together / number of data sets
sample mean = x bar
population mean = mu symbol - answer ✔✔-Calculating a mean
the middle - answer ✔✔-Calculating a median
difference between the lowest and the highest
max value - min value = range
, it's the easiest to find but not so good to use as it only uses two of your data values, doesn't take into
account all the values - answer ✔✔-Calculating the Range
Measure of spread
How far apart the numbers are in a data set is from the mean
population = sigma
sample = s
Add up differences / number of differences (same as calculating a mean) - answer ✔✔-Standard
deviation
take the number given of the subset and calculate the mean of that set - then do this for each number
moving down by one - answer ✔✔-Calculating a moving mean
middle of the bottom half after finding the median - answer ✔✔-Lower quartile
middle of the top half after finding the median - answer ✔✔-Upper quartile
Q = 1/2 (n + 1) th term - answer ✔✔-Finding quartiles on stem & leaf
The average squared distance to the mean - answer ✔✔-Variance
1. Linearity
2. Independence of errors/residuals
3. Normality of error/residuals
4. Equal variance - answer ✔✔-Assumptions of Regression
[LINE]
aka error
