Psy302 HW 5 - Homework Jamovi PDF

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Homework Jamovi ...

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Homework 5 (29 points total)

Humorous 6 4 4 4 3 6 8 3 6 5 5 4 3 3 4 2

Non-humorous 5 4 4 2 4 3 3 3 3 4 4 4 6 3 3 5

Problem 1 (14 points) Steven Schmidt (1994) conducted a series of experiments examining the effects of humor on memory. In one study, participants were given a mix of humorous and non-humorous sentences and significantly more humorous than non-humorous sentences were recalled. However, Schmidt argued that the humorous sentences were not necessarily easier to remember; they were simply preferred when participants had a choice between the two types of sentence. To test this argument, he used an independent-measures design in which one group got a set of humorous sentences and another group got a set of non-humorous sentences. The data above are the results from the study; values represent the number of sentences recalled. Load these data into jamovi from the file humor.csv. Output (4 points) 1) Decide what statistical test is appropriate with this data. Paste the necessary output for this analysis (both descriptive and inferential) from jamovi. (1 point) Provide tables with APA-style titles. (1 point) If your tables are too wide, resize them to fit on the page. Table 1 Descriptive and Inferential Statistics from Independent Sample T-Test for Measuring Mean sentence recall

2) Paste an appropriate graph from jamovi. Your graph should indicate the mean of each group along with error bars. (1 point) Provide your graph with an APA-style title. (1 point) Table 2 Graph of Independent Sample Data with Mean and Error Bars

Non-APA statement of decision about the null (3 points) 3) Define the null and make a decision about it by doing the following: ● Using words and specific values (e.g. not something like “μ1 = μ2”), report the specific null hypothesis for this study. (1 point) ● Write out your decision about the null: “I [reject OR fail to reject] the null …” (1 point) ● Write out your rationale for that decision: “… because [p < .05 OR p > .05]” (1 point)

The mean (M1 - M2 = 0) would be exactly the same for humorous and non-humorous sentences being recalled. We failed to reject the null hypothesis because there is no significant difference between the means of the group. We fail to reject the null hypothesis because p > . 05. APA-style report (7 points) Write an APA style report of your findings. Your report should include each of the following, with no errors of APA style and formatting. Round p-values to three decimal places; all other values to two. ● descriptive statistics for each of the samples (1 point each). ● the value of the test statistic (1 point) with its degrees of freedom (1 point) ● the precise p-value as reported by jamovi, e.g. not p < .05 but p = .015, unless jamovi reports p = .000, in which case you must use p < .001 (1 point). ● a clear statement of the findings. (1 point) If the findings are significant, your report should write about these in terms of the direction of differences, e.g. which group had higher average scores on the dependent variable. Otherwise, your report should state that there was no significant difference. ● Correct APA style (1 point) From our Independent T-Test we found that there was no significant difference between the sample of people who recalled humorous (M1 = 4.38 SD1 = 1.54) = sentences and those who recalled non-humorous (M2 = 3.75 SD2 = 1.00) sentences. (t(30) = 1.36) p = 0.184

Problem 2 Participant

During

Between

A B C

91 92 92

90 93 94

D

93

96

E F G H I J K L

93 95 91 88 92 93 93 91

96 97 92 91 94 96 94 95

At the Olympic-level of competition, even the smallest factors can make the difference between winning and losing. For example, Pelton (1983) has shown that Olympic markspersons shoot much better if they fire between heartbeats, rather than squeezing the trigger during a heartbeat. The small vibration caused by a heartbeat seems to be sufficient to affect aim. A sample of n=12 Olympic markspersons fires a series of rounds while a researcher records heartbeats. For each marksperson, a scores is recorded for shots fired during heartbeats and for shots fired between heartbeats. These data can be loaded into jamovi from the file heartbeats.csv. Output (4 points) 1) Paste the necessary output for this analysis (both descriptive and inferential) from jamovi. (1 point) Provide tables with APA-style titles. (1 point) If your tables are too wide, resize them to fit on the page (https://goo.gl/eDcyP4). Table 3 Descriptive and Inferential Statistics from Paired Samples T-Test

2) Paste an appropriate graph from jamovi. (1 point) Provide your graph with an APA-style title. (1 point) Table 4 Graph of Mean Scores During and Between Heartbeats

Non-APA statement of decision about the null (3 points)

3) Define the null and make a decision about it by doing the following: ● Using words and specific values (e.g. not something like “μ1 = μ2”), report the specific null hypothesis for this study. (1 point) ● Write out your decision about the null: “I [reject OR fail to reject] the null …” (1 point) ● Write out your rationale for that decision: “… because [p < .05 OR p > .05]” (1 point) The means (M1 – M2 = 0) of during and in between heartbeats would be exactly equal. I reject the null hypothesis because p is less than .05. APA-style report (6 points) Write an APA style report of your findings. Your report should include each of the following, with no errors of APA style and formatting. Round p-values to three decimal places; all other values to two. ·

descriptive statistics for each of the samples (1 point each).

·

the value of the test statistic (1 point) with its degrees of freedom (1 point)

· the precise p-value as reported by jamovi, e.g. not p < .05 but p = .015, unless jamovi reports p = .000, in which case you must use p < .001 (1 point). · a clear statement of the findings. (1 point) If the findings are significant, your report should write about these in terms of the direction of differences, e.g. which condition resulted in higher average scores on the dependent variable. Otherwise, your report should state that there was no significant difference. From our Paired Sample T -Test we found that the mean scored for shots fired between heartbeats ( M2 = 94.00 SD2 = 2.17 ) were significantly higher than those fired during heartbeats ( M1 = 92.00 SD1 = 1.71) (t(11) = -5.14) p < .001

[For information on titles and captions, see the APA Publication Manual or http://psych.utoronto.ca/users/reingold/courses/resources/handouts_apa/TablesFigures1.pdf]...