QUIZ 1
Using the average score to describe a sample is an example of inferential statistics.
FALSE
A researcher is interested in the average income for registered voters in the United States.
The entire group of registered voters is an example of a popula
Silvanus Santhosh / 0331565
November 23,2016
Introduction to Statistics
Short Answers
31. A population has a mean of = 80 with = 20. (3 POINTS)
a. If a single score is randomly selected from this population, how much distance, on
average, should you find
26. Compute SS, variance, and standard deviation for the following population: 1, 4, 8, 4. (3
POINTS)
N=4
EX = 17
Computational:
SS = EX - (EX)^2
N
SS = 97 - 17^2
4
SS = 24.75
Variance:
= SS
N
= 24.75
4
= 6.18
Standard Deviation
= EX
N
= 17
4
= 4.25
Sc
Short Answer
31. Calculate each value requested for the following set of scores: 3, 8, 2, 4.
X
= 3+8+2+4
= 17
X^2
= 3+8+2+4
= 3^2 + 8^2 + 2^2 + 4^2
= 93
(X)^2
= (3+8+2+4)^2
= (17)^2
= 289
32. Calculate each value requested for the following set of scor
Measures of Variability
There are many ways of describing the variability in some data set. In this guide we
.discuss the range, inter-quartile range and standard deviation
RangeThe range is the most obvious measure of dispersion and is the difference bet
A population has a mean of = 80 with = 20. (3 POINTS) a. If a single score is randomly .31
selected from this population, how much distance, on average, should you find between the
?score and the population mean
A. 20, because the standard deviation is 20
Probability
Unit 6 > Lesson 1 of 12
Problem: A spinner has 4 equal sectors colored yellow, blue,
green and red. What are the chances of landing on
blue after spinning the spinner? What are the
chances of landing on red?
Solution: The chances of landing on
For a population with = 30 and = 6, find the z-score corresponding to each .28
(of the following X values: 32, 42, 26, 22. (2 POINTS
(Z-Score (Measure of Variability
A Z-Score is a statistical measurement of a score's relationship to the
mean in a group o