Compute the ?-value of the chi-square statistic, ?2, using software. Give your answer in decimal form with precision to four decimal places.
Compute the ?-value of the chi-square statistic, ?2, using software. Give your answer in decimal form with precision to four decimal places.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Compute the ?-value of the chi-square statistic, ?2, using software. Give your answer in decimal form with precision to four decimal places.

Transcribed Image Text:According to Benford's Law, also known as the first-digit law, many sets of data contain numbers that have a distribution of leading digits as outlined in the table. The test proportions represent the hypothesized distribution of the leading digits according to Benford's Law.
The table displays a summary of observed counts of leading digits for a simple random sample of 2011 diabetes incidences for 300 U.S. counties. Perform a chi-square goodness-of-fit test using this data.
| Leading digit | Observed count | Test proportion | Expected count | Contribution to chi-square |
|---------------|----------------|-----------------|----------------|-----------------------------|
| 1 | 94 | 0.301 | 90.3 | 0.152 |
| 2 | 56 | 0.176 | 52.8 | 0.194 |
| 3 | 31 | 0.125 | 37.5 | 1.127 |
| 4 | 27 | 0.097 | 29.1 | 0.152 |
| 5 | 27 | 0.079 | 23.7 | 0.459 |
| 6 | 22 | 0.067 | 20.1 | 0.18 |
| 7 | 18 | 0.058 | 17.4 | 0.021 |
| 8 | 12 | 0.051 | 15.3 | 0.712 |
| 9 | 13 | 0.046 | 13.8 | 0.046 |
Chi-square statistic: 3.042
This table helps to assess how well the observed data fits the expected distribution proposed by Benford's Law through a chi-square test. Each row presents the leading digit, its observed and expected counts, the test proportion, and the contribution to the total chi-square statistic.
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Compute the ?-value of the chi-square statistic, ?^2. Give your answer in decimal form with precision to four decimal places.
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Follow-up Question
Compute the P- value of the chi-square statistic, X^2, using software. You may find software manuals helpful. Give your answer in decimal form with precision to four decimal places.
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