An investigator is interested in the effects of noise on the ability of subjects to concentrate....

  

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An investigator is interested in the effects of noise on the ability of subjects to concentrate. She assigns subjects randomly to one of three Noise conditions: low noise, moderate noise, and loud noise. She administers a test of concentration while the noise is present. She predicts that there will be an overall effect of noise on the ability to concentrate. • Theory A suggests that people in the low noise condition will have higher scores on concentration than subjects in the moderate noise condition. • Theory B suggests that no difference in concentration will be observed between subjects in the moderate and loud noise groups. Note, this is a null hypothesis statement! For theory B, the researcher wants to retain the null hypothesis. Use SPSS or Excel to determine if there is a difference (hint: ANOVA). State the test statistic for this ANOVA Run the appropriate follow-up t-tests to test each of Theory A and Theory B. State the test statistic for each theory. Be sure to state whether you found evidence supporting or denying the theory. Moderate Noise Loud Noise Low Noise 6. 5 10 3 4 11 3 4 5 13 12 13 5 10 An investigator is interested in the effects of noise on the ability of subjects to concentrate. She assigns subjects randomly to one of three Noise conditions: low noise, moderate noise, and loud noise. She administers a test of concentration while the noise is present. She predicts that there will be an overall effect of noise on the ability to concentrate. • Theory A suggests that people in the low noise condition will have higher scores on concentration than subjects in the moderate noise condition. • Theory B suggests that no difference in concentration will be observed between subjects in the moderate and loud noise groups. Note, this is a null hypothesis statement! For theory B, the researcher wants to retain the null hypothesis. Use SPSS or Excel to determine if there is a difference (hint: ANOVA). State the test statistic for this ANOVA Run the appropriate follow-up t-tests to test each of Theory A and Theory B. State the test statistic for each theory. Be sure to state whether you found evidence supporting or denying the theory. Moderate Noise Loud Noise Low Noise 6. 5 10 3 4 11 3 4 5 13 12 13 5 10