Family-wise Error Rate and Bonferroni Adjustment Quiz

What is the purpose of using the Scheffé adjustment for multiple comparisons?

To control the family-wise error rate

How does the Scheffé adjustment affect the p-value of each contrast?

It increases the p-value

What is the key assumption made when applying the Scheffé adjustment?

Performing all possible contrasts

Which method controls the family-wise error rate in multiple comparisons?

Scheffé adjustment Signup and view all the answers

In Example 5.3.1, how did the contrasts tested differ from those tested in examples 4.2.1 and 4.2.2?

They were run simultaneously with adjustments for multiple testing Signup and view all the answers

When using the Scheffé adjustment, what change is made to the degrees of freedom for calculating test statistics?

+g - 1 degrees of freedom Signup and view all the answers

What is the primary purpose of starter bacteria in cheese production?

To initiate the fermentation process Signup and view all the answers

Which bacteria were not intentionally added during the cheese production process?

Nonstarter bacteria Signup and view all the answers

How many cheeses were made with standard starter bacteria only?

8 Signup and view all the answers

Which of the following treatments was NOT included in the experiment?

Strain C only Signup and view all the answers

What is the primary reason for studying the effects of nonstarter bacteria on cheese quality?

To understand their influence on cheese quality Signup and view all the answers

How many cheeses were made with both strains A and B?

2 Signup and view all the answers

What is the purpose of Dunnett's method?

To compare each group to the control group Signup and view all the answers

Which function from the DescTools package can be used to perform Dunnett's method?

<code>DunnettTest()</code> Signup and view all the answers

In the example code `DunnettTest(freeAminoAcid ~ strain, data = CheeseAminoAcid, control = "none")`, what does the `control = "none"` argument specify?

It sets the control group to be the group named "none" Signup and view all the answers

Based on the output, which bacteria group(s) are significantly different from the control group ("none") with respect to the mean total free amino acids?

AB-none only Signup and view all the answers

What does the `lwr.ci` column in the output represent?

The lower bound of the 95% confidence interval for the difference Signup and view all the answers

What is the purpose of the Multiple Comparisons with the Best (MCB) method?

To compare each group to the best performing group Signup and view all the answers

What is the purpose of the `rbind()` function in the code snippet?

To combine the contrasts into a single matrix Signup and view all the answers

Which of the following statements about the use of Fisher's LSD method on the RatLiverWeight data is correct?

It is not appropriate to use Fisher's LSD method since it does not control the family-wise error rate Signup and view all the answers

What is the purpose of the `pf()` function call in the code snippet?

To calculate the p-value for the Scheffe adjustment Signup and view all the answers

What is the family-wise error rate?

The probability of making a type I error in at least one of the multiple comparisons Signup and view all the answers

In the Bonferroni method, how is the adjusted p-value for each test calculated?

The p-value is multiplied by the number of tests (K) Signup and view all the answers

In the Holm method, which p-value is compared to $\alpha/K$ first?

The smallest p-value Signup and view all the answers

If the Bonferroni method is used to adjust for multiple comparisons, what happens to the family-wise error rate?

The family-wise error rate is controlled at $\alpha$ Signup and view all the answers

Which statement about the Holm method is true?

It is more powerful than the Bonferroni method when all null hypotheses are true Signup and view all the answers

In Example 5.2.1, if the Bonferroni adjustment is used with $\alpha = 0.05$, how many contrasts would be considered significant?

3 Signup and view all the answers

Family-wise Error Rate and Bonferroni Adjustment Quiz

Questions and Answers

What is the purpose of using the Scheffé adjustment for multiple comparisons?

How does the Scheffé adjustment affect the p-value of each contrast?

What is the key assumption made when applying the Scheffé adjustment?

Which method controls the family-wise error rate in multiple comparisons?

In Example 5.3.1, how did the contrasts tested differ from those tested in examples 4.2.1 and 4.2.2?

When using the Scheffé adjustment, what change is made to the degrees of freedom for calculating test statistics?

What is the primary purpose of starter bacteria in cheese production?

Which bacteria were not intentionally added during the cheese production process?

How many cheeses were made with standard starter bacteria only?

Which of the following treatments was NOT included in the experiment?

What is the primary reason for studying the effects of nonstarter bacteria on cheese quality?

How many cheeses were made with both strains A and B?

What is the purpose of Dunnett's method?

Which function from the DescTools package can be used to perform Dunnett's method?

In the example code `DunnettTest(freeAminoAcid ~ strain, data = CheeseAminoAcid, control = "none")`, what does the `control = "none"` argument specify?

Based on the output, which bacteria group(s) are significantly different from the control group ("none") with respect to the mean total free amino acids?

What does the `lwr.ci` column in the output represent?

What is the purpose of the Multiple Comparisons with the Best (MCB) method?

What is the purpose of the `rbind()` function in the code snippet?

Which of the following statements about the use of Fisher's LSD method on the RatLiverWeight data is correct?

What is the purpose of the `pf()` function call in the code snippet?

What is the family-wise error rate?

In the Bonferroni method, how is the adjusted p-value for each test calculated?

In the Holm method, which p-value is compared to $\alpha/K$ first?

If the Bonferroni method is used to adjust for multiple comparisons, what happens to the family-wise error rate?

Which statement about the Holm method is true?

In Example 5.2.1, if the Bonferroni adjustment is used with $\alpha = 0.05$, how many contrasts would be considered significant?

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Family-wise Error Rate and Bonferroni Adjustment Quiz

Questions and Answers

What is the purpose of using the Scheffé adjustment for multiple comparisons?

How does the Scheffé adjustment affect the p-value of each contrast?

What is the key assumption made when applying the Scheffé adjustment?

Which method controls the family-wise error rate in multiple comparisons?

In Example 5.3.1, how did the contrasts tested differ from those tested in examples 4.2.1 and 4.2.2?

When using the Scheffé adjustment, what change is made to the degrees of freedom for calculating test statistics?

What is the primary purpose of starter bacteria in cheese production?

Which bacteria were not intentionally added during the cheese production process?

How many cheeses were made with standard starter bacteria only?

Which of the following treatments was NOT included in the experiment?

What is the primary reason for studying the effects of nonstarter bacteria on cheese quality?

How many cheeses were made with both strains A and B?

What is the purpose of Dunnett's method?

Which function from the DescTools package can be used to perform Dunnett's method?

In the example code DunnettTest(freeAminoAcid ~ strain, data = CheeseAminoAcid, control = "none"), what does the control = "none" argument specify?

Based on the output, which bacteria group(s) are significantly different from the control group ("none") with respect to the mean total free amino acids?

What does the lwr.ci column in the output represent?

What is the purpose of the Multiple Comparisons with the Best (MCB) method?

What is the purpose of the rbind() function in the code snippet?

Which of the following statements about the use of Fisher's LSD method on the RatLiverWeight data is correct?

What is the purpose of the pf() function call in the code snippet?

What is the family-wise error rate?

In the Bonferroni method, how is the adjusted p-value for each test calculated?

In the Holm method, which p-value is compared to $\alpha/K$ first?

If the Bonferroni method is used to adjust for multiple comparisons, what happens to the family-wise error rate?

Which statement about the Holm method is true?

In Example 5.2.1, if the Bonferroni adjustment is used with $\alpha = 0.05$, how many contrasts would be considered significant?

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In the example code `DunnettTest(freeAminoAcid ~ strain, data = CheeseAminoAcid, control = "none")`, what does the `control = "none"` argument specify?

What does the `lwr.ci` column in the output represent?

What is the purpose of the `rbind()` function in the code snippet?

What is the purpose of the `pf()` function call in the code snippet?