Find x2left and x2right for a 95% confidence interval using the chi-square distribution with 9 degrees of freedom. b) What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the standard deviation of their last exam was 12.7?
Ratios
A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.
Trigonometric Ratios
Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.
1a) Find x2left and x2right for a 95% confidence interval using the chi-square distribution with 9 degrees of freedom.
b) What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the standard deviation of their last exam was 12.7?
Answer all parts of the question, 1a and 1b. Thanks.
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