Researchers are interested in the effect of distractions on work efficiency. Forty college students volunteered to be part of an experiment in which half were randomly assigned to a quiet room and the other half to a room in which loud music was playing. The students were asked to complete an easy Sudoku puzzle and their completion times were recorded. A 95% confidence interval for the difference between mean completion times for the puzzle, music-no music, was found to be (5,11) minutes. Could this information be used to conclude that we should reject a null hypothesis of no difference in the average completion time between these two groups at a significance level of 0.05? A. Yes, because the confidence interval contains zero.
B. Yes, because the confidence interval does not include zero.
C. No, there is no relationship between confidence intervals and hypothesis tests.
D. No, this was not a properly designed experiment.