Exam 11: Inferences About Population Variances

The manager of the service department of a local car dealership has noted that the service times of a sample of 16 new automobiles has a standard deviation of 5 minutes. A 95% confidence interval estimate for the variance of service times for all their new automobiles is

(Multiple Choice)

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Question 41

A sample of n observations is taken from a normal population. The appropriate chi-square distribution has

(Multiple Choice)

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Question 42

The contents of a sample of 26 cans of apple juice showed a standard deviation of .06 ounces. We are interested in testing whether the variance of the population is significantly more than .003. At the .05 level of significance, the null hypothesis

(Multiple Choice)

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Question 43

To avoid the problem of not having access to tables of the F distribution when a one-tailed test is required and with F values given for the lower tail, let the

(Multiple Choice)

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Question 44

The chi-square value for a one-tailed (lower tail) test when the level of significance is .1 and the sample size is 15 is

(Multiple Choice)

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Question 45

At α = .1, test to see if the population variances from which the following samples were drawn are equal.

(Essay)

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Question 46

A sample of 61 observations yielded a sample standard deviation of 6. If we want to test H₀: σ² = 40, the test statistic is

(Multiple Choice)

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Question 47

Consider the following sample information from Population A and Population B. We want to test the hypothesis that the population variances are equal. The test statistic for this problem equals

(Multiple Choice)

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Question 48

To avoid the problem of not having access to Tables of F distribution when F values are needed for the lower tail, the numerator of the test statistic for a two-tailed test should be the one with

(Multiple Choice)

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Question 49

The 95% confidence interval estimate of a population variance when a sample variance of 324 is obtained from a sample of 81 items is

(Multiple Choice)

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Question 50

A sample of 61 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

(Multiple Choice)

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Question 51

A random sample of 31 sales charge showed a sample standard deviation of $50. A 90% confidence interval estimate of the population standard deviation is

(Multiple Choice)

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Question 52

The contents of a sample of 26 cans of apple juice showed a standard deviation of .06 ounces. We are interested in testing whether the variance of the population is significantly more than .003. The p-value for this test is

(Multiple Choice)

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Question 53

A sample of 20 cans of tomato juice showed a standard deviation of .4 ounces. A 95% confidence interval estimate of the variance for the population is

(Multiple Choice)

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Question 54

At α = .1, test to see if the population variances from which the following samples were drawn are equal.

(Essay)

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Question 55

Consider the following sample information from Population A and Population B. We want to test the hypothesis that the population variances are equal. The null hypothesis is to be tested at the 10% level of significance. The critical value from the F distribution table is

(Multiple Choice)

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Question 56

The symbol used for the variance of the sample is

(Multiple Choice)

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Question 57

The chi-square value for a one-tailed (upper tail) hypothesis test at a 5% level of significance and a sample size of 25 is

(Multiple Choice)

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Question 58

The random variable for a chi-square distribution may assume

(Multiple Choice)

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Question 59

The value of F_.05 with 8 numerator and 19 denominator degrees of freedom is

(Multiple Choice)

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Question 60

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Exam 11: Inferences About Population Variances

The manager of the service department of a local car dealership has noted that the service times of a sample of 16 new automobiles has a standard deviation of 5 minutes. A 95% confidence interval estimate for the variance of service times for all their new automobiles is

A sample of n observations is taken from a normal population. The appropriate chi-square distribution has

The contents of a sample of 26 cans of apple juice showed a standard deviation of .06 ounces. We are interested in testing whether the variance of the population is significantly more than .003. At the .05 level of significance, the null hypothesis

To avoid the problem of not having access to tables of the F distribution when a one-tailed test is required and with F values given for the lower tail, let​ the

The chi-square value for a one-tailed (lower tail) test when the level of significance is .1 and the sample size is 15 is

At α = .1, test to see if the population variances from which the following samples were drawn are equal.

A sample of 61 observations yielded a sample standard deviation of 6. If we want to test H0: σ2 = 40, the test statistic is

​Consider the following sample information from Population A and Population B. ​ ​​ We want to test the hypothesis that the population variances are equal. The test statistic for this problem equals

To avoid the problem of not having access to Tables of F distribution when F values are needed for the lower tail, the numerator of the test statistic for a two-tailed test should be the one with

The 95% confidence interval estimate of a population variance when a sample variance of 324 is obtained from a sample of 81 items is

A sample of 61 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 random sample of 31 sales charge showed a sample standard deviation of $50. A 90% confidence interval estimate of the population standard deviation is

The contents of a sample of 26 cans of apple juice showed a standard deviation of .06 ounces. We are interested in testing whether the variance of the population is significantly more than .003. The p-value for this test is

A sample of 20 cans of tomato juice showed a standard deviation of .4 ounces. A 95% confidence interval estimate of the variance for the population is

At α = .1, test to see if the population variances from which the following samples were drawn are equal.

​Consider the following sample information from Population A and Population B. ​ ​​ We want to test the hypothesis that the population variances are equal. The null hypothesis is to be tested at the 10% level of significance. The critical value from the F distribution table is

The symbol used for the variance of the sample is

The chi-square value for a one-tailed (upper tail) hypothesis test at a 5% level of significance and a sample size of 25 is

The random variable for a chi-square distribution may assume

The value of F.05 with 8 numerator and 19 denominator degrees of freedom is

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Introduction to Probability

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Inference About Means and Proportions With Two Populations

Comparing Multiple Proportions, Tests of Independence and Goodness of Fit

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To avoid the problem of not having access to tables of the F distribution when a one-tailed test is required and with F values given for the lower tail, let the

A sample of 61 observations yielded a sample standard deviation of 6. If we want to test H₀: σ² = 40, the test statistic is

Consider the following sample information from Population A and Population B. We want to test the hypothesis that the population variances are equal. The test statistic for this problem equals

Consider the following sample information from Population A and Population B. We want to test the hypothesis that the population variances are equal. The null hypothesis is to be tested at the 10% level of significance. The critical value from the F distribution table is

The value of F_.05 with 8 numerator and 19 denominator degrees of freedom is