Master T-Tests in HCI and Psychology

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Questions and Answers

What is the most widely used statistical test in HCI and related fields?

  • Regression analysis
  • T-test (correct)
  • ANOVA
  • Chi-squared test

What are the scores used to compute the means and standard deviations?

  • The variance around the mean
  • The number of participants in each condition
  • The time taken for each participant to select items from a menu (correct)
  • The difference between the means of two conditions

What is the standard deviation?

  • A statistical measure of the difference between two means
  • A statistical measure of the spread or variability around the mean (correct)
  • A statistical measure of the correlation between two variables
  • A statistical measure of the difference between two standard deviations

What is the null hypothesis?

<p>The hypothesis that there is no significant difference between the means of two conditions (B)</p> Signup and view all the answers

What is the t-value?

<p>The score derived from applying the t-test (C)</p> Signup and view all the answers

What does df stand for in a t-test result?

<p>Degrees of freedom (D)</p> Signup and view all the answers

How is df calculated?

<p>By summing the number of participants in one condition minus 1 and the number of participants in the other condition (C)</p> Signup and view all the answers

What does p represent in a t-test result?

<p>The probability that the effect found did not occur by chance (D)</p> Signup and view all the answers

What is a typical value of p considered good enough to reject the null hypothesis?

<p>p &lt; 0.05 (A)</p> Signup and view all the answers

What is the formula to calculate df?

<p>df = Na + Nb - 1 (C)</p> Signup and view all the answers

What is the significance of a p-value of 0.05?

<p>There is a 5% chance that the effect found is due to chance (A)</p> Signup and view all the answers

What is the alternative hypothesis?

<p>The hypothesis that there is a significant difference between the means of two conditions (D)</p> Signup and view all the answers

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