Longitudinal research on intelligence found that IQ scores ________. fluctuated after the early 20s decreased after the early 20s increased after the early 20s remained stable after the early 20s
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How does fluid intelligence change as we age? a. Decreases slowly with age b. Has not been measured over time c. Increases slowly with age d. Does not change until about age 75 e. Remains unchanged if we exercise
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Developmental psychologists at a prominent California university conducted a longitudinal study investigating the effect of high levels of curiosity in early childhood on intelligence. The local population of 3-year-olds was screened via a test battery assessing curiosity. Twelve of the 3 -year-olds scoring in the upper $90 \%$ of this variable were given an IQ test at age 3 and again at age 11 . The following IQ scores were obtained. $$ \begin{array}{ccc} \hline \begin{array}{l} \text { Subject } \\ \text { Number } \end{array} & \text { IQ (Age 3) } & \\ \hdashline 1 & 100 & 114 \\ 2 & 105 & 116 \\ 3 & 125 & 139 \\ 4 & 140 & 151 \\ 5 & 108 & 106 \\ 6 & 122 & 119 \\ 7 & 117 & 131 \\ 8 & 112 & 136 \\ 9 & 135 & 148 \\ 10 & 128 & 139 \\ 11 & 104 & 122 \\ 12 & 98 & 113 \\ \hline \end{array} $$ a. Using $\alpha=0.01_2$ what what do youclude? In drawing your conclusion, assume that it is well established that IQ stays relatively constant over these years for individuals with average or below-average levels of curiosity. b. What is the size of the effect?
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