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48 terms

Statistics Terms and Formulae

Use the "Show Symbols" check box to view symbols needed to answer some questions.
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upper-case sigma
What is the name of the "Σ" symbol?
population
"N" stands for the number of scores in a _____ .
sample
"n" stands for the number of scores in a _____.
population mean
"μ" is the symbol for the _____.
population standard deviation
"σ" is the symbol for the _____.
mu
What is the name of the "μ" symbol?
lower-case sigma
What is the name of the "σ" symbol?
raw score
"X" is a symbol meaning _____.
sample mean
"M" is a symbol for the _____.
Sum of Squared deviations
"SS" stands for _____.
ΣX, N
Fill in the blanks for population.
N
population variance = SS/___
N
σ = √(SS/___)
sample standard deviation
"s" stands for for the _____.
ΣX, n
Fill in the blanks for sample.
Degrees of freedom
_____ refers to the number of scores in a sample that are free to vary with no restriction.
1
Complete the formula: df = n - ___
mean
Variance is the _____ squared deviation.
sample variance
"s²" stands for _____.
n-1
s² is the same as SS/___
N
σ² is the same as SS/___
n-1
Complete this formula for the sample standard deviation.
z
Complete the formula: X = μ + ___σ
µ
Complete the formula.
s
Complete the formula: X = M + z___
standard error
This formula yields the _____.
30
The distribution of sample means is almost perfectly normal if (1) the population from the which the samples are selected is a normal distribution and (2) the number of scores in each sample is relatively large, around ___ or more.
M
Complete the formula.
alpha level
The ____ for a hypothesis is the probability that the test will lead to a Type I error.
Type I
A ___ error occurs when a researcher fails to reject the alternative hypothesis.
Type II
A ___ error occurs when a researcher fails to reject the null hypothesis.
power, power
The ___ of a statistical test is the probability that the test will correctly reject a false null hypothesis. That is, ___ is the probability that the test will identify a treatment effect if one really exists.
β
The power of a hypothesis test is equal to 1 - ___.
t-score
What will this formula yield?
abscissa
The horizontal line on a frequency distribution table is called the _____.
ordinate
The vertical line on a frequency distribution table is called the _____.
computational
This is the _____ formula.
sample mean
This symbol stands for the _____.
the standard deviation
What will this formula yield?
sample mean
This formula will allow you to locate a _____.
sample standard deviation
This formula yields _____.
sample variance
This formula yields _____.
estimated standard error
This formula yields _____.
larger
The larger the variance, the _____ (smaller / larger) the error.
computational formula for SS
What is this?
Cohen's d
This is the formula for _____.
This is the _____ formula.
increases
Increasing the sample size _____ (decreases / increases) the likelihood of rejecting the null hypothesis.