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Research Methods IV - Week 2 Between Subjects ANOVA

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Quiz sobre Research Methods IV - Week 2 Between Subjects ANOVA, criado por Brage Haavik em 12-04-2019.
Brage Haavik
Quiz por Brage Haavik, atualizado more than 1 year ago
Brage Haavik
Criado por Brage Haavik mais de 7 anos atrás
143
2
0

Resumo de Recurso

Questão 1

Questão
Why should you use an ANOVA rather than a lot of T-tests?
Responda
  • Performing lots of t-tests increases the probability of making a Type 1 error
  • Performing lots of t-tests increases the probability of making a Type 2 error
  • Performing lots of t-tests increases the chance of failing to reject a false null hypothesis
  • All of the above

Questão 2

Questão
The ANOVA statistic is calculated by ____________
Responda
  • Subtracting the between groups variance from the within groups variance
  • Adding the between groups variance to the within groups variance
  • Dividing the between groups variance by the within groups variance
  • Multiplying the between groups variance by the within groups variance

Questão 3

Questão
You calculate an F ratio and get a value more than 1. How would you interpret this?
Responda
  • There is more between groups variance than within groups variance
  • There is the same amount of between groups variance as within groups variance
  • There is less between groups variance than within groups variance
  • There is no within groups variance

Questão 4

Questão
You have calculated the SSbetween as 10 and the SStotal as 15, what would the SSwithin be?
Responda
  • 5
  • 0.67
  • -5
  • 25

Questão 5

Questão
Your study has four conditions with 20 participants in each condition. What would the df-within be?
Responda
  • 79
  • 76
  • 77
  • 80

Questão 6

Questão
Which of the following is the correct way to calculate the MSbetween
Responda
  • SSbetween / df-between
  • SSbetween / SStotal
  • SSbetween * df-between
  • SSbetween * df-total

Questão 7

Questão
A researcher wants to see if caffeine improves mathematics ability. She randomly assigned participants to three treatment groups: no caffeine (control), 40mg of coffee, and 80mg of coffee. After the treatment, all participants took a maths test. A one-way ANOVA was performed on the data. The output is shown below, but the F-value is missing. Using the other information in the table what should the F-value be?
Image:
Screen+Shot+2019 04 12+At+14.19.04 (binary/octet-stream)
Responda
  • 1.65
  • 22.32
  • 13.47
  • 11.00

Questão 8

Questão
What should the researcher conclude from the ANOVA results shown in question 7?
Image:
Screen+Shot+2019 04 12+At+14.19.04 (binary/octet-stream)
Responda
  • There was a significant effect of treatment type on maths ability
  • There was no significant effect of treatment type on maths ability
  • Maths ability was significantly worse with no caffeine
  • Caffeine significantly improves maths ability

Questão 9

Questão
What does the eta squared tell us?
Responda
  • If there is a significant difference between groups
  • How much variance in the dependent variable can be accounted for by the independent variable
  • How much variance in the independent variable can be accounted for by the dependent variable
  • If homogeneity has been established

Questão 10

Questão
If an author reports the results of an ANOVA as F (4, 65) = 9.56, p = 0.1, what is the between-groups degrees of freedom
Responda
  • 65
  • 9.56
  • 4
  • 5

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