RESEARCH METHODS THINKING CRITICALLY WITH PSYCHOLOGICAL SCIENCE
THE SCIENTIFIC METHOD AND DESCRIPTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
0 percent
|
|
|
2.5 percent
|
|
|
32 percent
|
|
|
50 percent
|
Detailed explanation-1: -For example, given that the IQ scores have a mean of 100 and a standard deviation of 15, one can conclude that only about 2.3% of the population have an IQ of 130 or higher.
Detailed explanation-2: -Values in this particular interval are the most frequent. Approximately 95% of the population has IQ scores between 70 and 130. Approximately 99.7% of the population has IQ scores between 55 and 145. Only approximately 0.3% of the population has IQ scores outside of this interval (less than 55 or higher than 145).
Detailed explanation-3: -About 95% of individuals have IQ scores in the interval 100 ± 2 ( 15 ) = [ 70, 130 ] .
Detailed explanation-4: -An IQ of 89 is 11 / 1 = 1 standard deviation below the mean, and 111 is 1 standard deviation above the mean. Therefore, using the empirical rule, 68% of people have IQ’s between 89 and 111. Those with IQ’s less than 89 and greater than 111 would be 100%-68% = 32%.