A Cognitive Psychologist Has Developed a Computer Simulation of Memory

question 5

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).

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Definitions:

Initial Cost

The initial expenditure needed to acquire an asset or initiate a project, encompassing purchase price and any other costs necessary to get the asset ready for use.

Straight-Line Depreciation

A method of depreciating an asset where its cost is reduced equally over its useful life.

Net Present Value

A method used in capital budgeting to evaluate the profitability of an investment, by calculating the difference between its present value of cash inflows and investment cost.