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The distribution graph below depicts the test scores for a (fictitious) statistics final exam from last year. Which of the following conclusions best describes the graph?
The graph is negatively skewed; the majority of the students did well on the test.
What is true about the mode?
It is always an actual number from the dataset.
When a histogram distribution is positively skewed, what can you confidently conclude?
There is an extreme outlier of a large value in the dataset.
Which of the following statements is accurate regarding the difference between a bar graph and a correlation scatterplot?
The bar graph depicts one variable, while the correlation scatterplot depicts two. The bar graph depicts a categorical value, while the correlation scatterplot does not.
What is the key takeaway from the Central Limit Theorem?
The greater the sample size, the more confident you can be about your statistical inferences of your sample on the population
Which of the following is not a benefit of a quasi-experiment design compared to a randomized controlled trial design?
Group differences can be ruled out because of the research design.
You set up a true experiment to look at if students who participate in a mindfulness training program at the start of the semester would be less stressed on the day of the final exam. Which is your independent variable (IV) and which is your dependent variable (DV)?
Participation in a mindfulness training (IV), self-rated stress on final exam day (DV).
You are planning a research study to explore if there is a link between nutrition and academic performance in university. You want to conduct a cross-sectional survey asking first-year psychology students to rate their consumption of fruit and their grade point average from the past semester.
Which of the following would be an appropriate null hypothesis for your study?
There is no relationship between fruit consumption and grade point average.
You carried out the data collection and conducted a correlation test between the amount of fruit consumption and the students' grade point averages and graphed the results (see graph below). Which conclusion is most appropriate, given your research design?
Eating fruits is associated with better grades.
What is the conclusion you can make about your null hypothesis given this finding?
The null is rejected.
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