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Alcohol Condition

PART I (22 points)

A study by Chen and colleagues (2014) tested what is known as the ‘beer-goggles effect.’ This is the idea that subjective perceptions of physical attractiveness becomes less accurate after drinking alcohol. The logic is that: (i) alcohol consumption reduces accuracy in symmetry judgements, and (ii) symmetrical faces (like Denzel Washington) are rated as more attractive. Thus, drinking alcohol will lead people to rate unattractive people as being more attractive than they actually are (based on facial symmetry) – the ‘beer-goggles effect.’ However, drinking alcohol should not impact attractiveness ratings for people who are initially highly attractive (based on facial symmetry). The data below is not the actual data from the Chen et al. (2014) study.

There are 32 participants who were randomly assigned to one of three Alcohol Conditions:
(i) A Low-dose group who drank 500ml of low-strength beer (n = 16)
(ii) A High-dose group who drank 500ml of high-strength beer (n = 16)

After their drink, participants rated the attractiveness of 50 faces that had been pre-assigned (based on symmetry) to one of two Face Types: Attractive or Unattractive. Thus, half of the participants within a group (n = 8) received 50 attractive faces and the other half (n = 8) received 50 unattractive faces.

The attractiveness of the faces was rated on a 0 to 10 point scale (higher numbers = more attractive) and averaged together for each participant. This Attractiveness Rating is the dependent variable.

Round all calculations to 2 decimal points as you conduct them. This will help to ensure that round-off error is the same for everyone (including for the grading TAs).

Use this scenario to answer the questions in Part 1.

Alcohol Condition

Face Type Low-dose Group
n = 16 High-dose Group
n = 16
Attractive
n = 16 M = 6.63
SD = 0.74 M = 6.75
SD = 1.28
Unattractive
n = 16 M = 4.25
SD = 1.39 M = 6.50
SD = 1.69

  1. Define what a main effect is, then state what the main effects are in this example. (2 points)

ANSWER

  1. Define what an interaction effect is, then state the interaction in this example. (2 points)

ANSWER

  1. Use the Ms in the table above to answer the following questions. (3 points total)

a. Calculate the two means that should be compared to consider whether there is a possible main effect for Alcohol Condition? [Hint. The means are not in the table. Show your calculations.] (1 points)

ANSWER

b. Calculate the two means that should be compared to consider whether there is a possible main effect for Face Type? [Hint. The means are not in the table. Show your calculations.] (1 points)

ANSWER

c. Which means should be compared to consider whether there is a possible interaction between Alcohol Condition and Face Type? (1 points)

ANSWER

  1. The calculation questions below use the example study and data above. The question is broken down into sub-questions. Please make sure to complete the calculations within each sub-question so that you can receive partial credit for your calculations that are correct, if needed. Show your work. [Hint. A few values are already filled in in the ANOVA Table below to help with the number of calculations that will be needed. It may be helpful to follow along with the lecture to make sure you’re following the steps correctly.] 13 points total)

a. Compute your MSwithin and MSbetween. (2 points)

ANSWER

b. Convert MSbetween to SSbetween. (1 points)

ANSWER

c. Compute the MSalcohol and SSalcohol. (2 points)

ANSWER

d. Compute the MSface and SSface. (2 points)

ANSWER

e. Compute the SSIXN. (1 point)

ANSWER

f. Compute the MSIXN. (1 point)

ANSWER

g. First, restate your MSwithin, MSalcohol, MSface, and MSIXN from the previous questions. Then compute your F-ratios. You MUST show your work for the F-ratio calculations. (3 points)

ANSWER

h. Correctly fill in the ANOVA Table. The values given to you below are so you can check your work, so if your values are slightly different due to rounding error, change the values below to what you calculated. If your values are very different, recheck your calculations. (1 point)

Source SS df MS F-ratio
Between Groups
Alcohol Condition
Face Type Condition
Alcohol x Face Type 5.15
Within Groups
Total 82.80 31

  1. Calculate the effect size (eta-squared) for the interaction effect, and interpret what it means in the context of the question. (2 points)

ANSWER

PART II

For Part II of the Assignment this week you will actually be reporting on the analyses that you conducted in lab section, rather than conducting a new set of analyses. Thus, you will not be copy and pasting R code below. Instead, you will focus on interpreting the output.

  1. Interpret the results from the two-way ANOVA that you conducted in Lab 4 this week below. Ensure that you are including all of the needed components in your interpretation. Your results must be written up in APA Style. For full credit, you must report results for all effects, whether they are statistically significant or not. Include descriptive statistics for all effects as well. (10 points)

ANSWER

ANSWER

ANSWER

  1. In lab section, you created a line graph with Condition on the x-axis, and Major represented as different lines. Create a line graph instead with Major on the x-axis and Condition on separate lines. (2 points)

a. Paste the R code below. (1 point)

ANSWER

b. Paste the line graph below. (1 point)

ANSWER

Sample Solution

Falcon Poem Harjo is a "clarification" in Joy Harjo's sonnet "Happiness Poetry" discussing petition and life, and how they create around labor. While combining normally, I feel that we are in a spot we didn't envision, and I feel what I might want to do in that superb and quiet spot. In the wake of perusing this sonnet he/she prefers that verse type. This is on the grounds that "Falcon" demands thoughts and extends it to the entire sonnet. For instance, it supplicates from start to finish, is discussing nature and creatures. Individuals will never reconsider they go There are a couple of things throughout everyday life. Until Robert Francis composed a sonnet called "Falcon Plain", the notorious significance of American Eagle was one of them. The sonnet was discharged during the 200th commemoration of the United States, so the planning couldn't be improved. As Poet 180 stated, "This sonnet surveys the conventional images", however this is putting it mildly. Notwithstanding assessing the conventional images, this sonnet totally modifies this undisputed image and the peruser's perspective overall of the United States utilizing short provisos loaded up with provocative lines. This sonnet causes the peruser to see how to add such a large number of implications to images really hurt more than great The entire sonnet is about how we regard arbitrary things and these things never think about it. For me, this sonnet is said from an American perspective. This sonnet discloses to the peruser how American Eagle couldn't care less about the United States and regards Americans. In this sonnet, the writer clarifies that the falcon "will never attempt to look humble". An exceptional and significant course is "American Eagle never said that he will serve on the off chance that he is chosen. Robin Skeleton's sonnet "Bird" is a free sonnet. This implies there is no particular or unsurprising rhyme or example in the sonnet. Skeletons utilize unusual delays and accentuation by doling out words utilizing periods. These all supplement the beat of verse. For instance, "Discombobulation is my region" in the principal line. With full stop, perusers can focus on the earnestness of verse. It underscores the basic character of bird by making an announcement. A case of Skelton underscoring words with free verse is on line 4. If it's not too much trouble put this toward the finish of the sentence with the goal that the peruser can underline the following line. It takes milliseconds to peruse the following word on the following line, not on a similar line. The sentence "Kindly don't trouble him or more" proceeds. This assists with underlining "no" for explaining and tuning in.
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