Equations
The Sum of X / n is the formula for what
Mean
Correlation is not ______
Causation
What are the three measures of central tendency?
Mean, Median, Mode
If the sign of the z-score is negative, this indicates that the score is ___ the mean.
below.
probability is equivalent to_______
The Sum of (X-M)^2 is the formula for what
Sum of Squares
Using PEMDAS, what do you do last?
Subtraction
Which measure of central tendency is most susceptible to extreme scores?
Mean
Adding a constant score to all scores will do what to the standard deviation.
Nothing.
standard error of M is a measure of _____
distance is expected on average between a sample mean (M) and the population mean (μ).
SS/n-1 is the formula for
sample variance
NOIR stands for:
Nominal, Ordinal, Interval, Ratio
In a negatively skewed distribution, the most probable order is
mean, median, and mode
In a population with a mean of μ = 65, a score of X = 59 corresponds to z = −2.00, sigma is___
3.
the larger the sample size (n), the more probable it is that the sample mean will be close to the population mean is the ____
z(S.D.)+ M is the formula for
To create a standardized score
We like Ratio data the best because
absolute zero point
What % of scores are +/- 1 SD?
68%
What Z score is associated with extreme outliers?
Beyond Z=+/- 2
By the time the sample size reaches n = ___, the distribution is almost perfectly normal.
M-miu/sigma is the formula for
When you are asking someone for the number of siblings they have, what type of variable is it most likely and what is the most likely scale used?
For number of siblings, the scale of measurement that is probably used is ratio and it is a discrete variable.
How we account for the bias in sample variability?
Use n-1 over N
A Score of 50 has a Z-Score of 1.5. The new standard deviation is 10 and the new mean is 50. Calculate the new standardized score
65
What are the two steps needed when you are asked to find the Probabilities & Proportions for Scores from a Normal Distribution (Example: How many players scored less than 30 times in a season)
Transform the X values into z-scores.
Look up the z-score value in the unit normal table