# The StanfordBinet IQ test is an example of a standardized test. This basically means that a…

The
StanfordBinet IQ test is an example of a standardized test. This basically
means that a population mean and standard deviation have been established for
the test. We know that the average score in the population of StanfordBinet
test takers is 100 with a standard deviation of 15. Since cholesterol is an
essential element of cell membranes in the central nervous system (it controls
the permeability of the cells in the brainextremely low levels can lead to
leaky cells), you decide to test the cognitive abilities of patients who
suffer from hypo cholesterolemia (thought be genetic in
»

The
StanfordBinet IQ test is an example of a standardized test. This basically
means that a population mean and standard deviation have been established for
the test. We know that the average score in the population of StanfordBinet
test takers is 100 with a standard deviation of 15. Since cholesterol is an
essential element of cell membranes in the central nervous system (it controls
the permeability of the cells in the brainextremely low levels can lead to
leaky cells), you decide to test the cognitive abilities of patients who
suffer from hypo cholesterolemia (thought be genetic in origin) using their
score on the StanfordBinet test as a measure of cognition. Your data are as
presented in Table 9.4.

a.
Calculate X_, _X, X, and _.

b.
Describe the effects of hypo cholesterolemia on IQ score in your sample. Do you
see any change in cognitive ability as we have defined it?

c.
What is your research question? What are the and alternative hypotheses?
Decide if you want to do a one-tailed or a two-tailed test.

d.
Calculate the value of z. What is your critical z-value?

e.
Sketch a normal distribution, and draw the critical value or values of z.

f.

»

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