Goodness of Fit Test: Telephone Calls Received
Not what you're looking for?
8. During 200 randomly selected minutes, the number of telephone calls received each minute were recorded. At the .05 level of significance, is there any evidence that these data are not Poisson with a mean of 2.8?
Number of
Calls Per Observed
Minute Frequency
0 11
1 46
2 50
3 47
4 28
5 11
6 or more 7
(a) What are the null and alternate hypotheses?
(b) Let X = number of calls per minute. What is the expected frequency of the class X = 3?
9. The following distribution shows the frequencies of aptitude test scores for a random sample of 60 test takers. At the .10 level of significance, is there any evidence that these data are NOT normally distributed with a mean of 72 and a standard deviation of 8?
Observed
CLASS Frequency
50 ? X < 60 10
60 ? X < 70 18
70 ? X < 80 24
80 ? X < 90 6
90 ? X < 100 2
(a) What are the null and alternate hypotheses?
(b) Let X = an aptitude test score. Find the expected frequency of the class: 80 ? X < 90.
Purchase this Solution
Solution Summary
A goodness of fit test with telephone calls received are determined.
Solution Preview
8. (a) What are the null and alternate hypotheses?
H0: these data are consistent with Poisson distribution with a mean of 2.8.
H1: these data are not consistent with Poisson ...
Purchase this Solution
Free BrainMass Quizzes
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.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.