A researcher was interested in stress levels of lecturers during lectures. She took the same group of 8 lecturers and measured their anxiety (out of
A researcher was interested in stress levels of lecturers during lectures. She took the same group of 8 lecturers and measured their anxiety (out of 15) during a normal lecture and again in a lecture in which she had paid students to be disruptive and misbehave. The data were normally distributed. Which test should she use to compare her experimental conditions?
Paired samples t-test (or also known as dependent t-test)
MannWhitney test
Wilcoxon rank-sum test
Wilcoxon signed-rank test
If you are examining the relationship between two variables, and the variables are measured on interval or ratio scales, you should conduct a ______.
Pearsons r
Spearmans rho
chi-square goodness of fit
one-way ANOVA
If you are examining the relationship between two variables, and the variables are ordinal, you should conduct a ______.
Pearsons r
Spearmans rho
one-way ANOVA
two-way ANOVA
A study was undertaken to investigate opinion of adults in Australia to final episode of Game of Thrones TV show. An electronic copy of the White Pages phone book for the Wagga Wagga area was used as the sampling frame, and a random number generator was used to select which numbers to call. Out of 64,000 adults living in Wagga Wagga, a total of 4,000 eligible adults were contacted and invited to take part in June 2019. Of these 2,000 completed the telephone interview.
What group constitutes the population in this study?
64,000 adults
Adults living in Wagga Wagga
2,000 adults
Australian adults
A study was undertaken to investigate opinion of adults in Australia to final episode of Game of Thrones TV show. An electronic copy of the White Pages phone book for the Wagga Wagga area was used as the sampling frame, and a random number generator was used to select which numbers to call. Out of 64,000 adults living in Wagga Wagga, a total of 4,000 eligible adults were contacted and invited to take part in June 2019. Of these 2,000 completed the telephone interview.
What is the sample size in this study?
64,000
4,000
2,000
A study was undertaken to investigate opinion of adults in Australia to final episode of Game of Thrones TV show. An electronic copy of the White Pages phone book for the Wagga Wagga area was used as the sampling frame, and a random number generator was used to select which numbers to call. Out of 64,000 adults living in Wagga Wagga, a total of 4,000 eligible adults were contacted and invited to take part in June 2019. Of these 2,000 completed the telephone interview.
What is the sampling fraction?
0.5
0.0625
0.03125
16
A researcher measured the same group of peoples physiological reactions while watching horror films and compared them to when watching erotic films. The resulting data were skewed. What test should be used to analyse the data?
Independent t-test
Wilcoxon signed-rank test
Dependent (related/paired) t-test
MannWhitney test
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.
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.
What is the directional alternative hypothesis for the following question: Does eating salmon make your skin glow?
Eating salmon does not predict the glow of skin.
People who eat salmon will have a similar complexion to those who do not.
People who eat salmon will have a more glowing complexion compared to those who dont.
There will be no difference in the appearance of the skin of people who eat salmon compared to those who dont.
Which of the following statements about Pearsons correlation coefficient is not true?
It varies between 1 and +1.
It can be used as an effect size measure.
It can be used on ranked data.
It cannot be used with binary variables (those taking on a value of 0 or 1).
When interpreting a correlation coefficient, it is important to look at:
The magnitude of the correlation coefficient.
All of these.
The significance of the correlation coefficient.
The +/ sign of the correlation coefficient.
What does the graph below show?
Linearity
Homoscedasticity
MulticollinearityNormality of residuals
What do the results in the table below show?
Work productivity Time spent on Facebook
Work productivity Pearsons correlation 1.000 .94
Sig. (2-tail) . .000
N 100 100
Time spent on Facebook Pearsons correlation .94 1.000
Sig. (2-tail) .000 .
N 100 100
In a sample of 100 people, there was a strong negative relationship between work productivity and time spent on Facebook, r = .94, p < .001.
In a sample of 100 people, there was a weak negative relationship between work productivity and time spent on Facebook, r = .94, p < .001.
In a sample of 100 people, there was a non-significant negative relationship between work productivity and time spent on Facebook, r = .94, p < .001.
In a sample of 100 people, there was a strong negative but non-significant relationship between work productivity and time spent on Facebook, r = .94, p > .001.
A researcher was interested in examining what factors influenced childrens scores in a fitness test. He ran a multiple linear regression, which included four predictors (hours spent taking part in physical activity per day, calories consumed per day, BMI, and hours spent watching TV per day).
His model had a R2 of .665, an adjusted R2 of .661, an F-statistic of 112.56 (p 0.00). How would you interpret his findings?
It is not a significant model.
It is a significant model where the four predictors account for 66% of the variance in the childrens scores in the fitness test.
It is a significant model where the four predictors account for 112% of the variance in the childrens scores in the fitness test.
It is a significant model where the four predictors account for 0.661 of the variance in the childrens scores in the fitness test
A researcher was interested in stress levels of lecturers during lecturers. She took the same group of 8 lecturers and measured their anxiety (out of 15) during a normal lecture and again in a lecture in which she had paid students to be disruptive and misbehave. Based on the SPSS output, how would you interpret these results?
There were no significant differences between anxiety levels in normal lectures and in those in which students misbehaved.
We cant tell any of the above from the output given.
Anxiety levels were significantly higher in lectures in which students misbehaved.
Anxiety levels were significantly lower in lectures in which students misbehaved.
In the paired sample t test above, how was the degree of freedom (df) calculated? N stands for sample size (i.e. 8 lecturers)
N - 2
N 1
N - 1
N
