Ch. 5, 8, 11 Flashcards
The Percentile Point is at the….
Pth Percentile Rank
The Population Distribution involves the ?
Mean (mu) AND the Standard Deviation (sigma)
In a RANDOM sampling procedure, sample data are drawn from the ?
Population randomly & independently
The mean & the SD of the Sample Distribution are symbolized by:
X bar & s
Both the Population & Sample Distributions are distributions of:
RAW SCORES
Population Mean & Sample mean are …
Usually different from one another
Sampling Distribution is a distribution of :
SAMPLE MEANS
Mean of the Sample Means is symbolized by:
X bar & little x bar
Sample mean is assumed to be the same as
The Population Mean
The SD of the sampling distribution is called the:
Standard Error of the Mean (SE)
The Standard Error of the Mean is an index of
ERROR
The Standard Error of the Mean is estimated by:
the SD divided by the square root of N (sample size)
When the population SD is known the SE is computed by:
sigma (SD) divided by the square root of N (sample size)
When the population Standard Deviation is NOT known, the STANDARD ERROR is computed by:
s divided by the square root of N (sample size)
Distribution of the Sample means is called:
Sampling Distribution
How would you describe:
P.90 = 80
80 is at the 90th percentile rank
How many Quartile points are there?
there are 3;
Q1, Q2, Q3
what are the names of the quartile points & their percent’s ?
Lower Quartile is Q1 = 25
Middle Quartile is Q2 = 50
Upper Quartile is Q3 = 75
Interquartile Range is:
Q3 - Q1
P.75 - P.25
Semi Quartile Range is
Q3 - Q2 divided 2
P.75 - P.25 divided by 2
Z score is a measurement of
Relative Standing on the SD unit
Normal Distribution is
a theoretical distribution based on an Infinite # of cases
In a Normal Distribution the Mean, Median, & Mode are
ALL identical AND they divide the distribution into equal halves
ND is shaped how ?
ND is what about the central point?
ND is Bell shaped & Symmetrical about the central point
