A Cognitive Psychologist Has Developed a Computer Simulation of Memory

Multiple Choice

A cognitive psychologist has developed a computer simulation of memory processes that generates a simulation of reaction times in response to the presentation of previously learned stimuli.The program has been designed to produce a mean reaction time of 200 msec with a standard deviation of 20.The psychologist is worried that the program has stopped working properly because the last 16 trials have produced a mean reaction time of 190 (with the expected standard deviation of 20) .The researcher compares the two means using a z-test to ask whether the observed mean is lower than the expected mean.Which of the following statements is false?

A) A t-test could not be used on these data as the standard deviation is known.
B) A t-test could be used on these data even though the standard deviation is known but the z-test is the best option.
C) A t-test could be used on these data even though the standard deviation is known and it is a better option than the z-test because it can be done in SPSS.
D) A t-test could be used on these data but the z-test is the best option as it is simpler.
E) All of the above apart from (b) .