To test the effect of visual distraction on reaction time, a researcher tests a

Question

To test the effect of visual distraction on reaction time, a researcher tests a group of 13 subjects under two conditions. In the control condition, the subjects have to press a key as soon as possible when a target stimulus appears on a blank computer screen. In the experimental condition, the subjects are given the same task, but the target stimulus always appears surrounded by other distractor stimuli. Reaction time is measured in milliseconds in both conditions. The data are below. Test whether distracters affected reaction time using a t-test.

Distractors absent Distractors present

335 340

360 358

404 405

393 415

387 382

364 368

355 372

328 337

375 375

380 391

346 354

361 370

318 315

1. Identify the:

IV___________________________________    DV_____________________________

2. Is it one-tailed or two-tailed? ______________

3. State Hypotheses mathematically: H0: H1: _________________                                                           

4. State Hypotheses in words:

H0: ______________________________________________________________________

H1: ______________________________________________________________________

5. Run the proper t-test using SPSS. Write a paragraph in APA-style to summarize the results of this study.

T-Test IDataSet0] Paired Samples Statistics Std. Error Mean Mean Std. Deviation 13 13 25.78436 27.72137 7.15130 7 68852 Pair 1 absent 362.0000 present 367.8462 present 367 8462 Paired Samples Correlations Correlation Sig Pair1 absent & present 959 Paired Samples Test Pairec Differences 95% Confidence Interval ofthe Difference Std. Error Mean Mean Std. Deviation 7.93564 owe Upper dfISig (2-tailed) Pair 1 absent present 584615 2 20095 10.84161 105070

Explanation / Answer

1. Identify the:

IV: Whether visual distraction present or absent    DV: Reaction time

2. Is it one-tailed or two-tailed? Two tailed

3. State Hypotheses mathematically:

let d be the average difference of reaction time (absent - present)

H0: d = 0

H1: d 0

4. State Hypotheses in words:

H0: There is no difference in mean reaction time with and without distractors

H1: There is difference in mean reaction time with and without distractors

5. Run the proper t-test using SPSS. Write a paragraph in APA-style to summarize the results of this study.

Paired t test was conducted to test if there is difference in mean reaction time with and without distractors. There was not a significant difference in mean reaction time with and without distractors (M=-5.85,SD=7.94); t(12)=-2.66, p=0.21. These results suggest that there is no difference in mean reaction time with and without distractors.

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