T-Tests and Statistical Analysis
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Questions and Answers

Which type of statistical analysis is used to compare the averages of two groups and determine if the differences between them are more likely to arise from random chance?

  • ANOVA
  • Regression analysis
  • Chi-square test
  • t-test (correct)
  • What distribution does the test statistic follow under the null hypothesis in a t-test?

  • Uniform distribution
  • Exponential distribution
  • Poisson distribution
  • Normal distribution (correct)
  • When does the test statistic in a t-test follow a Student's t distribution?

  • When the scaling term is known
  • When the sample size is small
  • When the scaling term is estimated based on the data (correct)
  • When the sample size is large
  • What is the most common application of a t-test?

    <p>Comparing means of two populations</p> Signup and view all the answers

    When was the t-distribution first derived as a posterior distribution?

    <p>1876</p> Signup and view all the answers

    Which statistical test is used on paired nominal data?

    <p>McNemar's test</p> Signup and view all the answers

    What does sensitivity measure in a diagnostic test?

    <p>The ability to correctly identify people with the disease</p> Signup and view all the answers

    What does specificity measure in a diagnostic test?

    <p>The ability to correctly identify people without the disease</p> Signup and view all the answers

    What is the purpose of the transmission disequilibrium test?

    <p>To detect linkage disequilibrium in genetics</p> Signup and view all the answers

    What is the name of the person who introduced McNemar's test?

    <p>Quinn McNemar</p> Signup and view all the answers

    Which type of data is McNemar's test used for?

    <p>Nominal data</p> Signup and view all the answers

    What does McNemar's test determine in a 2x2 contingency table?

    <p>Equality of row and column marginal frequencies</p> Signup and view all the answers

    What are the commonly used parameters to assess a diagnostic test in medical sciences?

    <p>Sensitivity and specificity</p> Signup and view all the answers

    What does sensitivity measure in a diagnostic test?

    <p>Ability to correctly identify people with the disease</p> Signup and view all the answers

    What does specificity measure in a diagnostic test?

    <p>Ability to correctly identify people without the disease</p> Signup and view all the answers

    Which of the following statements about Kendall's W is true?

    <p>Kendall's W is used to assess agreement among raters.</p> Signup and view all the answers

    What does a Kendall's W of 0 indicate?

    <p>No overall trend of agreement among respondents.</p> Signup and view all the answers

    In what range does Kendall's W lie when there is complete agreement among respondents?

    <p>0 to 1</p> Signup and view all the answers

    What is Kendall's W used for?

    <p>Evaluating inter-rater reliability.</p> Signup and view all the answers

    What does a Kendall's W of -1 indicate?

    <p>Complete disagreement among respondents.</p> Signup and view all the answers

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