Identify the error that was made in the following situation: A researcher conducts a one-tailed hypothesis test to test whether a study technique increases performance on a memory test. They know scores on the memory test are normally distributed and select a sample of 45 participants who use the study technique. Using Table A-1, they determine their cutoff z-score is +2.33. They calculate an observed z-score of -4.50. The researcher decides to reject the null hypothesis..