A Cognitive Psychologist Has Developed a Computer Simulation of Memory

question 13

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) .Which of the following statements is true?

• A)A z-score could be calculated for these data.
• B)A z-score could be calculated for these data but no inferences could be made.
• C)A z-score could be calculated for these data but no inferences could be made because it is impossible to get ethical clearance for computer simulations.
• D)A z-score could be calculated but it could not be used to make inferences because the population standard deviation is unknown.
• E)A z-score could be calculated but it could not be used to make inferences because the population standard deviation is likely to be a negative number.

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