Question

1. A sample of 51 elements is selected to estimate a 95% confidence interval for the variance of the population. The chi-square values to be used for this interval estimation are a. -1.96 and 1.96 b. 32.357 and 71.420 c. 34.764 and 67.505 d. 12.8786 and 46.9630 Answer: 2. We are interested in testing whether the variance of a population is significantly less than 1.44. The null hypothesis for this test is a. H0: ?^2 < 1.44 b. H0: s^2 ? 1.44 c. H0: ? ? 1.20 d. H0: ?^2 ? 1.44 Answer: 3. A sample of 41 observations yielded a sample standard deviation of 5. If we want to test H0: ?^2 = 20, the test statistic is a. 100 b. 10 c. 51.25 d. 50 Answer: 4. The value of F.05 with 8 numerator and 19 denominator degrees of freedom is a. 2.48 b. 2.58 c. 3.63 d. 2.96 Answer: 5. To avoid the problem of not having access to Tables of F distribution with values given for the lower tail, the numerator of the test statistic should be the one with a. the larger sample size b. the smaller sample size c. the larger sample variance d. the smaller sample variance

          1. A sample of 51 elements is selected to estimate a 95% confidence interval for the variance of the population. The chi-square values to be used for this interval estimation are
a. -1.96 and 1.96
b. 32.357 and 71.420
c. 34.764 and 67.505
d. 12.8786 and 46.9630
Answer:

2. We are interested in testing whether the variance of a population is significantly less than 1.44. The null hypothesis for this test is
a. H0: ?^2 < 1.44
b. H0: s^2 ? 1.44
c. H0: ? ? 1.20
d. H0: ?^2 ? 1.44
Answer:

3. A sample of 41 observations yielded a sample standard deviation of 5. If we want to test H0: ?^2 = 20, the test statistic is
a. 100
b. 10
c. 51.25
d. 50
Answer:

4. The value of F.05 with 8 numerator and 19 denominator degrees of freedom is
a. 2.48
b. 2.58
c. 3.63
d. 2.96
Answer:

5. To avoid the problem of not having access to Tables of F distribution with values given for the lower tail, the numerator of the test statistic should be the one with
a. the larger sample size
b. the smaller sample size
c. the larger sample variance
d. the smaller sample variance

1. A sample of 51 elements is selected to estimate a 95% confidence interval for the variance of the population. The chi-square values to be used for this interval estimation are
a. -1.96 and 1.96
b. 32.357 and 71.420
c. 34.764 and 67.505
d. 12.8786 and 46.9630
Answer:

2. We are interested in testing whether the variance of a population is significantly less than 1.44. The null hypothesis for this test is
a. H0: ?^2 < 1.44
b. H0: s^2 ? 1.44
c. H0: ? ? 1.20
d. H0: ?^2 ? 1.44
Answer:

3. A sample of 41 observations yielded a sample standard deviation of 5. If we want to test H0: ?^2 = 20, the test statistic is
a. 100
b. 10
c. 51.25
d. 50
Answer:

4. The value of F.05 with 8 numerator and 19 denominator degrees of freedom is
a. 2.48
b. 2.58
c. 3.63
d. 2.96
Answer:

5. To avoid the problem of not having access to Tables of F distribution with values given for the lower tail, the numerator of the test statistic should be the one with
a. the larger sample size
b. the smaller sample size
c. the larger sample variance
d. the smaller sample variance

Added by Frank J.

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