How do you make the correlation coefficient (r) show up
on your calculator when you do a linear regression?
What letter/symbol do we use to denote the Pearsonproduct moment correlation coefficient? What do we
use to denote the coefficient of determination?
Answer:
DiagnosticOn (under CATALOG “2nd 0”)
Answer:
Pearson product moment correlation coefficient: r
Coefficient of determination: r2
What is the percentage of data that falls within ONE
standard deviation of a normal distribution?
In a normal distribution:
– you want to find a probability or percentage of a data
value that does NOT fall on a standard deviation
– what calculator function do you use and what buttons
do you press to get to it?
Answer:
68%
Answer:
Normalcdf (2nd VARS option 2:)
Then you put in lower bound, upper bound, mean, and
standard deviation
What are the calculator directions to find one-variable
statistics or two-variable statistics?
In a normal distribution:
– you are given a probability or percentage in order for
you to find a data value
– what calculator function do you use and what buttons
do you press to get to it?
Answer:
STAT: option 1) Edit (put data in L1 and/or L2)
STAT  CALC option 1) One-Variable Stats or option 2)
Two-Variable Stats
Answer:
InvNorm (2nd VARS option 3:)
Then you put in percent in decimal form to the left of the
value, mean, and standard deviation
What is the percentage of data that falls within THREE
standard deviations of a normal distribution?
What is the percentage of data that falls within TWO
standard deviations of a normal distribution?
Answer:
99% or 99.7%
Answer:
95%
What is a least squares regression line?
Answer:
A best-fit line or a linear regression
What are the two hypotheses of a Chi-Square Test and
what are they supposed to state?
Answer:
H0 (null) – the variables are independent
Ha (alternate) – the two variables are not independent
How do you know when to reject H0 using the X2
statistic?
Answer:
If the X2 is higher than the critical value, you reject H0
What point does a best-fit line aka a linear regression
always go through?
Answer:
The mean of x and the mean of y
x, y 
If you do a regression and get an r2 value of .70, is it a
strong, moderate or weak correlation?
Answer:
Moderate correlation
How do you know when to reject H0 using the p-value?
Answer:
If the p-value is lower than the significance level, you
reject H0
How do you find the degrees of freedom?
Answer:
(#rows – 1)(#columns – 1)
If there is a strong, negative linear correlation, what
number is the r value close to?
Answer:
-1
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