Chi-Squared Problems
Not what you're looking for?
1. For the following set of scores, find the value of ach expression:
X
6
-1
0
-3
-2
a. ∑X
b. ∑X²
c. ∑(x+3)
2. The following frequency distribution presents a set of exam scores for class of n=20 students.
X
6
-1
0
-3
-2
X f cf c%
90-99 4 20 100
80-89 7 16 80
70-79 4 9 45
60-69 3 5 25
50-59 2 2 10
A. find the 30th percentile
B. find the 88 percentile
C. what is the percentile rank for x=77
D. what is the percentile rank for x=90
Purchase this Solution
Solution Summary
Two problems are solved dealing with chi-squared distributions and percentile ranks.
Solution Preview
Please see the attached file.
Qk = L+w/fk*(kn-cfb)
Where
Qk = the kth percentile
L = lower limit of the class interval that includes the kth percentile
n = total frequency
cfb = ...
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.