Albany State University Frequency Distribution Questionnaire
Description
Part A
1) What is the idea behind frequency distribution?
2) Which is the common sampling method?
3) What is the measure of central tendency called?
4) What observation basically describes a sample size?
5) What is the measure of dispersion from a mean called?
6) Sample mean or the population mean: which varies the most?
7) Sample mean or individual observation: which varies the most?
8) What is the benefit of increasing the sample size?
9) Numerically characterize a Standard Normal Distribution
10) What is the very important characteristic of t-distribution?
Part B
2) With the following randomly selected observations:
a) Determine the Regression Equation.
b) Determine the value of Y hat when X is 7
X
Y
XY
X2
5
13
3
15
6
7
3
12
4
13
4
11
6
9
8
5
Part C
2) From the following randomly selected observations:
a) Determine the Pearson Coefficient of Correlation, r.
b) Interpret the association between X and Y.
c) Estimate the Coefficient of Determination, R2.
X
X-x
(X- x )2
Y
(Y-y)
(Y-y) 2
(X-x)(Y-y)
5
13
3
15
6
7
3
12
4
13
4
11
6
9
8
5
Tags: population frequency distribution Common sampling method
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