The sampling distribution of (n-1)s² / s²is a normal probability distribution.

1.   ?    True
2.   ?    False

The random variable for the chi-square probability distribution may not assume negative values.

1.   ?    True
2.   ?    False

The chi-square probability distribution is symmetric.

1.   ?    True
2.   ?    False

The chi-square value with area to the right of .10 with 16 degrees of freedom is

1.   ?    9.31223
2.   ?    22.3072
3.   ?    23.5418
4.   ?    26.2962

The chi-square value with area to the left of .05 with 12 degrees of freedom is

1.   ?    4.57481
2.   ?    5.22603
3.   ?    19.6751
4.   ?    21.0261

When a sample variance of 25 is obtained from a sample of 10 items from a normal population, the 80% confidence interval for a population variance is

1.   ?    12.3 to 57.1
2.   ?    13.3 and 67.7
3.   ?    14.1 to 46.25
4.   ?    15.3 to 53.98

A maximum acceptable standard deviation for a process is 0.5. To test this, which would be the appropriate null hypothesis?

1.   ?    m> 0.5
2.   ?    s < 0.5
3.   ?    s £ 0.5
4.   ?    s ¹0.5
5.   ?    None of the above

A maximum acceptable standard deviation for a process is 0.5. A sample of size 20 is taken from a normal distribution, giving s = 0.6. The appropriate decision with a = .05 is

1.   ?    reject the null hypothesis
2.   ?    do not reject the null hypothesis

For the F distribution, the number of degrees of freedom in the numerator must be greater than or equal to the number of degrees of freedom in the denominator.

1.   ?    True
2.   ?    False

When a sample variance of 25 is obtained from a sample of 10 items from a normal population, the 90% confidence interval for a population variance is

1.   ?    12.3 to 57.1
2.   ?    13.3 and 67.7
3.   ?    14.1 to 46.25
4.   ?    15.3 to 53.98

The sampling distribution of the ratio of independent sample variances from two normally distributed populations with equal variances is the

1.   ?    chi-square distribution
2.   ?    normal distribution
3.   ?    F distribution
4.   ?    t distribution

The F value with area to the right of .025 with numerator degrees of freedom 12 and denominator degrees of freedom 10 is

1.   ?    2.91
2.   ?    3.37
3.   ?    3.62
4.   ?    4.71

These sample results were obtained for independent random samples from two normally distributed populations.
Sample 1 Sample 2
Sample Size 10 16
Sample Variance 25 20
Using a .05 level of significance, one critical value needed to use the F test for the equality of the population variances is

1.   ?    2.59
2.   ?    3.01
3.   ?    3.12
4.   ?    3.89

These sample results were obtained for independent random samples from two normally distributed populations.
Sample 1 Sample 2
Sample Size 10 16
Sample Variance 25 20
The value of the test statistic F is

1.   ?    .13
2.   ?    .5
3.   ?    1.12
4.   ?    1.25

These sample results were obtained for independent random samples from two normally distributed populations.
Sample 1 Sample 2
Sample Size 10 16
Sample Variance 25 20
Using a .05 level of significance, which conclusion would be reached for these data?

1.   ?    There is a statistically significant difference between the variances of the two populations.
2.   ?    There is no statistically significant difference between the variances of the two populations.
3.   ?    Insufficient data - can't tell in this case.