The sampling distribution used when making inferences about a single population variance is the

1.   ?    t distribution with (n - 1) degrees of freedom
2.   ?    chi-square distribution with (n - 1) degrees of freedom
3.   ?    F distribution with (n - 1) degrees of freedom for the numerator and (n - 1) degrees of freedom for the denominator
4.   ?    none of the above

The sampling distribution of the ratio of two independent sample variances extracted from normal populations with equal variances is the

1.   ?    t distribution
2.   ?    chi-square distribution
3.   ?    F distribution
4.   ?    normal distribution
5.   ?    none of the above

X².90 with 20 degrees of freedom is

1.   ?    28.412
2.   ?    27.204
3.   ?    11.651
4.   ?    12.443
5.   ?    none of the above

To avoid the problem of not having access to tables of F distribution with values given for the lower tail when a two-tailed test is required, let the sample with the smaller sample variance be

1.   ?    the numerator of the test statistic
2.   ?    the denominator of the test statistic
3.   ?    It makes no difference how the ratio is set up
4.   ?    none of the above

A sample of 20 cans of tomato juice showed a standard deviation of 0.4 ounces. A 95% confidence interval estimate for the variance of the population is

1.   ?    0.2313 to 0.8533
2.   ?    0.2224 to 0.7924
3.   ?    0.0889 to 0.3169
4.   ?    0.0925 to 0.3413

A process is in control if the maximum variance is .05. Assume that the population is normally distributed. A sample of size 26 showed a sample variance of .06. Is the process in control?

1.   ?    Ho: s² ³0.05
2.   ?    Ho: s² > 0.05
3.   ?    Ho: s² < 0.05
4.   ?    Ho:s² £ 0.05
5.   ?    none of the above

A process is in control if the maximum variance is .05. Assume that the population is normally distributed. A sample of size 26 showed a sample variance of .06. the value of the test statistic is

1.   ?    104
2.   ?    20.83
3.   ?    37.65
4.   ?    26.00
5.   ?    none of the above

A process is in control if the maximum variance is .05. Assume that the population is normally distributed. A sample of size 26 showed a sample variance of .06. The critical value at 95% confidence is

1.   ?    14.611
2.   ?    15.379
3.   ?    37.652
4.   ?    38.885
5.   ?    none of the above

The F.05 value with 20 numerator degrees of freedom and 30 denominator degrees of freedom is

1.   ?    1.93
2.   ?    1.94
3.   ?    2.20
4.   ?    2.55
5.   ?    none of the above

A sample of 40 items from population 1 has a sample variance of 8 while a sample of 60 items from population 2 has a sample variance of 10. If we test whether the variances of the two populations are equal, the test statistic will have a value of

1.   ?    0.8
2.   ?    1.56
3.   ?    1.5
4.   ?    1.25
5.   ?    none of the above