Investigators want to test whether people who worked overnight shifts reported less sleep per day than the general population. They conduct a one-tailed, one-sample t-test, comparing the mean number of hours of sleep in a sample of people who worked overnight shifts (sample mean= 6.5 hours) to the general population mean of 7.5 hours. Their calculated t-statistic had a corresponding p-value of 0.0345. Which of the following represents the best interpretation of this p-value?
3.45% of people who worked overnight shifts reported more than 7.5 hours of sleep per day.
a. The probability that a person who works overnight shifts will get 7.5 hours of sleep or more per day is 3.45%.
b. The probability of obtaining a result as extreme or more extreme than the one observed if the null hypothesis is true is 3.45%.
c. The probability that a person who works overnight shifts will get 6.5 hours of sleep or more per day is 3.45%.
d. The probability of obtaining a result less extreme than the one observed if the null hypothesis was true is 3.45%.