A) R = 0998

question 99

Multiple Choice

$$\begin{array}{l}\text { Find the value for } r \text { and test the significance of } r \text { at the } 5 \% \text { level and at the } 1 \% \text { level. }\\\begin{array} { c | c c c c } x & 21 & 14 & 18 & 23 \\\hline y & 9 & 1 & 5 & 11\end{array}\end{array}$$

• A) r = 0.998. r is significant at the 5% level, but not at the 1% level
• B) r = 0.998. r is significant at the 5% level and the 1% level
• C) r = 0.995. r is significant not significant at the 5% level or the 1% level
• D) r = 0.995. r is significant at the 5% level, but not at the 1% level

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Definitions:

Stimulus Difference

The minimal change in a stimulus that can produce a just noticeable difference in sensory perception.

Absolute Threshold

The minimum quantity of physical energy required for an observer to detect a stimulus 50% of the time.

Sensory Adaptation

The process by which sensory receptors become less sensitive to constant or unchanging stimuli over time.

High-volume Car Stereo

A car audio system capable of producing very loud sounds, often customized or enhanced beyond factory settings.