Compute test statistic (Independent t-score) Pooled variance S2p: Estimated standard error S(M1-M2) : Computed Independent t statistic: 2. Make a decision about the null hypothesis and state a conclusion. Decision: Are you going to reject the null or fail to reject the null Conclusion: ex. The independent variable did or did not have a significant effect Remember: if you reject, there was significance When people learn a new task, their performance usually improves when they are tested the next day, but only if they get 6 hours sleep (Sticckgold, et al., 2000). The following data demonstrate this phenomenon. The participants learned a visual discrimination task on one day. Half of the participants were allowed to have at least 6 hours of sleep and the other half were kept awake all night. 6 hours sleep No sleep n =14 n = 14 M = 72 M =65 SS = 932 SS = 706 Is there a significant difference between the two conditions? Use a two-tailed test with α = .01. Remember use the attached t-distribution chart when obtaining your critical region.
- Compute test statistic (Independent t-score)
Pooled variance S2p:
Estimated standard error S(M1-M2) :
Computed Independent t statistic:
2. Make a decision about the null hypothesis and state a conclusion.
Decision: Are you going to reject the null or fail to reject the null
Conclusion: ex. The independent variable did or did not have a significant effect
Remember: if you reject, there was significance
When people learn a new task, their performance usually improves when they are tested the next day, but only if they get 6 hours sleep (Sticckgold, et al., 2000). The following data demonstrate this phenomenon. The participants learned a visual discrimination task on one day. Half of the participants were allowed to have at least 6 hours of sleep and the other half were kept awake all night.
6 hours sleep No sleep
n =14 n = 14
M = 72 M =65
SS = 932 SS = 706
Is there a significant difference between the two conditions? Use a two-tailed test with α = .01.
Remember use the attached t-distribution chart when obtaining your critical region.
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