If a researcher were conducting a one-tailed/directional hypothesis test with an alpha of 0.01 and he chooses to place the critical region in the left-hand tail, what is the correct value for Zcrit?
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If a researcher were conducting a one-tailed/directional hypothesis test with an alpha of 0.01 and he chooses to place the critical region in the left-hand tail, what is the correct value for Zcrit?
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- When should the Wilcoxon Signed-Rank test be used instead of a paired t-test?In reading the results of a multiple regression analysis that contained 4 predictor variables, the researcher noticed a column labeled Beta. Two of the Beta’s were positive and two were negative. He concluded that a.) Beta’s that were positive were statistically significant b.) Beta’s that were positive had more of an effect c.) Beta’s that were positive were associated with increases in the criterion variable d.) Beta’s that were positive did not affect the criterion because they were “controlled for…”Prior to an intensive TV advertising campaign, the producers of Nike athletic shoes find that 29 of a random sample of 200 upper-income adults are aware of their new leisure shoe line. A second random sample of 300 such adults is taken after the campaign. Now 96 of the persons sampled can identify the new line. Is the increase in the proportion of upper income adults showing brand awareness significant? Test the claim using alpha = .05.
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