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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?

The hypothesis that there is no significant difference between the means of two conditions Signup and view all the answers

What is the t-value?

The score derived from applying the t-test Signup and view all the answers

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

Degrees of freedom Signup and view all the answers

How is df calculated?

By summing the number of participants in one condition minus 1 and the number of participants in the other condition Signup and view all the answers

What does p represent in a t-test result?

The probability that the effect found did not occur by chance Signup and view all the answers

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

p < 0.05 Signup and view all the answers

What is the formula to calculate df?

df = Na + Nb - 1 Signup and view all the answers

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

There is a 5% chance that the effect found is due to chance Signup and view all the answers

What is the alternative hypothesis?

The hypothesis that there is a significant difference between the means of two conditions Signup and view all the answers