1.A researcher conducted a study to examine the impact of social media usage on sleep quality. Sleep quality was assessed in three social media usage conditions (see below). A high sleep quality score means high sleep quality.

Condition 1: High level usage

Condition 2: Medium level usage

Condition 3: Low level usage

Assuming the data collected reflect a highly skewedinterval variable, answer the following questions.

(a) The measure of central tendency you would use for this when the interval data is highly skewed:

[ Choose ] As social media usage decreases, the sleep quality score (as measured central tendency) decreases. Social media usage As social media usage decreases, the sleep quality score (as measured central tendency) increases. Employees Mean There is no relationship between the social media usage level and the sleep quality score. Mode Median Sleep quality score

(b) What conclusion about the study should you draw when the measure of central tendency for the high, medium, and low usage group is 6, 7.5, 9 respectively?

[ Choose ] As social media usage decreases, the sleep quality score (as measured central tendency) decreases. Social media usage As social media usage decreases, the sleep quality score (as measured central tendency) increases. Employees Mean There is no relationship between the social media usage level and the sleep quality score. Mode Median Sleep quality score

(c) What is the independent variable?

[ Choose ] As social media usage decreases, the sleep quality score (as measured central tendency) decreases. Social media usage As social media usage decreases, the sleep quality score (as measured central tendency) increases. Employees Mean There is no relationship between the social media usage level and the sleep quality score. Mode Median Sleep quality score

(d) What is the dependent variable?

[ Choose ] As social media usage decreases, the sleep quality score (as measured central tendency) decreases. Social media usage As social media usage decreases, the sleep quality score (as measured central tendency) increases. Employees Mean There is no relationship between the social media usage level and the sleep quality score. Mode Median Sleep quality score

2.A researcher conducted a study to examine the impact of temperature on aggression. Assuming the data is representative (normal distribution), draw how we would envision the populations produced by this experiment. Assuming the average aggression score for all three conditions are as follows:

Condition 1: Low temperature: 3

Condition 2: Medium temperature: 5

Condition 3: High temperature: 8

(Hint: Go to p.78, Figure 4.11 in the textbook. Your graph should follow similar format. I strongly recommend that you read the entire "Inferring the relationship in the population" section on p.78. We will dive into the concept of sample data and population later on.)