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Twenty-one cats were given 300g of tuna each. The time in seconds was measured until they had eaten all of the tuna:
16, 18, 18, 22, 22, 23, 23, 24, 26, 29, 32, 34, 34, 36, 36, 42, 43, 46, 46, 49, 57
- Compute the median.
- Compute the lower quartile.
- Compute the upper quartile.
- Compute the interquartile range.
- 32 seconds
- 22.5 seconds
- 42.5 seconds
- 20 seconds
Answer: 32 seconds
An experimenter measured 30 children’s IQ. He then rank-ordered the children and assigned them a score from 30 (most intelligent) to 1 (least intelligent) to create a new variable. Does this new variable consist of:
- Nominal data
- Interval data
- Ratio data
- Ordinal data
Answer: Ordinal data
When items on a questionnaire appear to correspond to the construct that the questionnaire claims to measure it is said to have:
- Factorial validity
- Ecological validity
- Content validity
- Criterion validity
Answer: Content validity
Variation due to some genuine effect is known as:
- Unsystematic variation
- Systematic variation
- Homogeneous variance
- Residual variance
Answer: Systematic variation
The degree to which a statistical model represents the data collected is known as the:
Ordinal level data are characterized by:
- Equal intervals between each adjacent score.
- A fixed zero.
- Data that can be meaningfully arranged by order of magnitude.
- None of the above.
Answer: Data that can be meaningfully arranged by order of magnitude
For what is the ‘variable view’ in IBM SPSS’s data editor used?
- Entering data.
- Writing syntax.
- Viewing output from data analysis.
- Defining characteristics of variables.
Answer: Defining characteristics of variables
Which of the following is the least affected by outliers?
- The range
- The mean
- The median
- The standard deviation
Answer: The median
What symbol represents the test statistic for the Mann–Whitney test?
The covariance is:
- All of these.
- A measure of the strength of relationship between two variables.
- Dependent on the units of measurement of the variables.
- An unstandardized version of the correlation coefficient.
Answer: All of these
R2 is known as the:
- Coefficient of determination.
- Multiple correlation coefficient.
- Partial correlation coefficient.
- Semi-partial correlation coefficient.
Answer: Coefficient of determination
- Used to correct for unmeasured variables that could affect the outcome variable.
- Is a method of portioning the results of ANOVAs to investigate where differences between independent variables lie.
- Is a robust version of ANOVA.
- An extension of ANOVA that partials out the effect of other measured variables.
Answer: An extension of ANOVA that partials out the effect of other measured variables
How many dependent variables does a two-way ANOVA have?
A researcher measured the same group of people’s physiological reactions while watching horror films and compared them to when watching comedy films, and a documentary about wildlife. The resulting data were normally distributed. What test should be used to analyse the data?
- Independent analysis of variance
- Repeated-measures analysis of variance
- Kruskal–Wallis test
- Friedman’s ANOVA
Answer: Repeated-measures analysis of variance
Which of the following statements about MANOVA is correct?
- MANOVA is appropriate for data that have one or more dependent variables and more than two independent variables.
- MANOVA is appropriate for data with two or more dependent variables and one or more independent variables.
- MANOVA is appropriate for data with two or more dependent variables and only one independent variable.
- MANOVA is appropriate for data with only one dependent variable and more than three independent variables.
Answer: MANOVA is appropriate for data with two or more dependent variables and one or more independent variables.
A Cronbach’s alpha value of .85 for a questionnaire means that:
- The questionnaire is valid.
- The questionnaire has good reliability.
- The questionnaire has too few items.
The questionnaire would produce different scores if used on the same people at two different points in time.
Answer: The questionnaire has good reliability.
A researcher asked 933 people what their favourite type of TV programme was: news, documentary, soap or sports. They could only choose one answer. As such, the researcher had the number of people who chose each category of programme. How should she analyse these data?
- One-way analysis of variance
- Chi-square test
Answer: Chi-square test
Chi-square is used to analyse:
- Any of these
Using a goodness-of-fit test, we can assess whether a set of obtained frequencies differ from a set of _______ frequencies:
Logistic regression is used when you want to:
- Predict a dichotomous variable from continuous or dichotomous variables.
- Predict a continuous variable from dichotomous variables.
- Predict any categorical variable from several other categorical variables.
- Predict a continuous variable from dichotomous or continuous variables.
Answer: Predict a dichotomous variable from continuous or dichotomous variables
In binary logistic regression:
- The dependent variable is continuous.
- The dependent variable is divided into two equal subcategories.
- The dependent variable consists of two categories.
- There is no dependent variable.