In: Statistics and Probability
1. The variance in drug weights is critical in the pharmaceutical industry. For a specific drug, with weights measured in grams, a sample of 18 units provided a sample variance of s2 = 0.36. Construct a 90% confidence interval estimate of the population variance for the weight of this drug.
Select one:
a. 0.22 ≤≤ σσ2 ≤≤ 0.71
b. 0.42 ≤≤ σσ2 ≤≤ 0.87
c. 2.08 ≤≤ σσ2 ≤≤ 16.7
d. 1.23 ≤≤ σσ2 ≤≤ 2.55
2.
A sample of 27 items from population 1 has a sample variance 17.45 and a sample of 31 items from population 2 has a sample variance 5.39. Test the following hypotheses at the 0.01 level of significance.
Compute critical value and make a statement about H0.
Select one:
a. Test statistic = 0.31, reject H0
b. Test statistic = 3.24, can't reject H0
c. Test statistic = 3.24, reject H0
d. Test statistic = 0.31, can't reject H0
3.
A sample of 10 items from population 1 has a sample variance 5.8 and a sample of 16 items from population 2 has a sample variance 2.4. Test the following hypotheses at the 0.05 level of significance.
Compute critical value and make a statement about H0.
Select one:
a. Test statistic = 0.41, reject H0
b. Test statistic = 2.42, can't reject H0
c. Test statistic = 0.41, can't reject H0
d. Test statistic = 2.42, reject H0