Table 7 in the Appendix is useful for obtaining percentiles for the chi-square distribution for a wide
Question:
where x2a is the upper percentile of the chi-square distribution with df = v and za is the upper a percentile of a standard normal distribution.
a. For df = 20, compare the values obtained from the approximation for x2.05 and x2.95 to the values listed in Table 7.
b. For df = 60, compare the values obtained from the approximation for x2.05 and x2.95 to the values listed in Table 7.
c. For df = 90, compare the values obtained from the approximation for x2.05 and x2.95 to the values listed in Table 7.
d. For df = 240, compare the values obtained from the approximation for x2.05 and x2.95 to the values listed in Table 7.
e. Comment on the accuracy of the approximation for the percentiles obtained in parts (a)(d).
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An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker