Suppose the IQ Scores $( y$ , Rounded to the Nearest $10 )$

question 24

Multiple Choice

Suppose the IQ scores $( y$ , rounded to the nearest $10 )$ for a group of people are summarized in the table below. Use the regression feature of a graphing utility to find a quadratic function of the form $y = a x ^ { 2 } + b x + c$ for the data.
$\begin{array}{|c|c|}\hline \text { IQ Score } & \text { Number of People } \\\boldsymbol{y} & \boldsymbol{x} \\\hline 70 & 50 \\\hline 80 & 76 \\\hline 90 & 89 \\\hline 100 & 93 \\\hline 110 & 74 \\\hline 120 & 53 \\\hline 130 & 16 \\\hline\end{array}$

• A) \(y = - 0.04 x ^ { 2 } + 15.08 x - 411.58\)
• B) \(y = - 0.06 x ^ { 2 } + 12.06 x - 484.21\)
• C) \(y = - 0.08 x ^ { 2 } + 10.98 x - 508.43\)
• D) \(y = - 0.07 x ^ { 2 } + 13.63 x - 460\)
• E) \(y = - 0.09 x ^ { 2 } + 8.56 x - 556.85\)

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Definitions:

Hypothesis

A proposed explanation for a phenomenon made as a starting point for further investigation, testing, or experimentation.

Plausible

Seeming reasonable or probable; believable or credible.

Indirectly

Not directly, but by means of an intermediate step or through a secondary cause.

Hypothesis

A proposed explanation for a phenomenon, made as a starting point for further investigation, testing, or experimentation.