Suppose 36 participants complete an experiment where ads are presented subliminally during a task (e.g., Coke ads are flashed at very fast rates during movie ads). Participants are then given a...

Suppose 36 participants complete an experiment where ads are presented subliminally during a task (e.g., Coke ads are flashed at very fast rates during movie ads). Participants are then given a recognition test for images in the ads, in which two images are presented and participants must choose which one of the two was presented earlier. However, the researcher wants to know if standard ads (e.g., a glass of Coke being poured over ice) are remembered differently than emotional ads (e.g., a person drinking a Coke is tightly hugging another person). To test this, each of the 36 participants completes the recognition task for both types of ads (i.e., when first presented, both types of ads are shown in a random order and recognition trials are included for both types of ads). Thus, each participant will have a separate recognition score for standard and emotional ads.

a. State the alternative and null hypotheses for this study.

b. The sample mean for the difference scores in this study was 15% with a standard deviation of 5%. Calculate the sample t score for this study.

c. What decision should the researcher make about the null hypothesis in this study? What can the researcher conclude about their prediction from this decision?