The average NPI-16 score in the population of Psychology students is four, with a standard deviation of 1.8. A researcher wondered whether environmental factors might affect students’ NPI-16 scores, so he asked a random sample of 36 Psychology students to watch a documentary about Donald Trump. The researcher then measured their scores on the NPI-16, and found that the mean score in this sample was 3.4. What p-value is associated with this statistic?
.0228
.9775
.0456
.0500
