Question
An instructor whishes to see whether the variation in scores of the 23 students in her class is less than the variance of the population. The variance of the class is 198. Is there enough evidence to support the claim that the variation of the students is less than the population variance (�� 2 = 225) at α = 0.05?. Assume that the scores are normally distributed
142
likes710 views
Answer to a math question An instructor whishes to see whether the variation in scores of the 23 students in her class is less than the variance of the population. The variance of the class is 198. Is there enough evidence to support the claim that the variation of the students is less than the population variance (�� 2 = 225) at α = 0.05?. Assume that the scores are normally distributed
Santino
4.5112 Answers
1. State the null and alternative hypotheses:
H_0: \sigma^2 = 225
H_a: \sigma^2 < 225
2. Identify sample size, sample variance, population variance, and significance level:
n = 23
s^2 = 198
\sigma_0^2 = 225
\alpha = 0.05
3. Calculate the Chi-Square test statistic:
\chi^2 = \frac{(23-1)s^2}{\sigma_0^2} = \frac{22 \cdot 198}{225} \approx 19.36
4. Determine the critical value from the Chi-Square distribution table:
\chi^2_{0.05, 22} \approx 12.338
5. Compare the test statistic to the critical value:
19.36 > 12.338
6. Make a decision:
\text{Do not reject } H_0
Answer:
\text{There is not enough evidence to support the claim that the variation of the students is less than the population variance at } \alpha = 0.05
2. Identify sample size, sample variance, population variance, and significance level:
3. Calculate the Chi-Square test statistic:
4. Determine the critical value from the Chi-Square distribution table:
5. Compare the test statistic to the critical value:
6. Make a decision:
Answer:
Frequently asked questions (FAQs)
What is the vertex form of a parabola function with a vertex at (2, -3), and what does the value of 'a' represent? (
+
What is the length of side c in a triangle if side a is 5, side b is 7, and the included angle is 60 degrees?
+
Math question: Convert 0.0000042 to scientific notation. (200 characters)
+
New questions in Mathematics