Question

1 . A sample of 20 cans of tomato juice showed a standard deviation of 0.4 ounces. A 95% confidence interval estimate of the variance for the population is . 0.2313 to 0.8533 b. 0.2224 to 0.7924 c. 0.3042 to 0.5843 d. 0.0925 to 0.3413 2. Last year, the standard deviation of the ages of the students at UA was 1.8 years. Recently, a sample of 31 students had a standard deviation of 2.1 years. We are interested in testing to see if there has been a significant change in the standard deviation of the ages of the students at UA. The null hypothesis is b. H 18 c, d. ?>1.8 ? 1.8 3. Refer to the information in Q2. The test statistic (chi-square value) is a. 22.04 b. 35.00 c. 40.83 d. 16.20 4. Refer to the information in Q2. At 95% confidence the null hypothesis a. should be rejected b. should not be rejected c. should be revised d. None of these alternatives is correct. 5. The contents of a sample of 26 cans of apple juice showed a standard deviation of 0.06 ounces. We are interested in testing to determine whether the variance of the population is significantly more than 0.003. The alternative hypothesis is a. S0003 b. S 0.003 ?/>0.003 ?2:0.003 c. d. 6. Refer to the information in Q5. The test statistic (chi-square value) is l, b. 31.2 c. 30 d. 500 7, Refer to the information in Q5. At 95% confidence, the null hypothesis a. should be rejected b. should not be rejected c. should be revised d None of these alternatives is correct

Answer 1