Nine Students Took the SAT $\mu _ { \mathrm { d } }$

question 79

Multiple Choice

Nine students took the SAT. Their scores are listed below. Later on, they took a test preparation course and retook the SAT. Their new scores are listed below. Construct a 95% confidence interval for $\mu _ { \mathrm { d } }$ Assume the
Samples are random and dependent, and the populations are normally distributed. $$\begin{array} { l | c c c c c c c c c } \text { Student } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\\hline \text { Scores before course } & 720 & 860 & 850 & 880 & 860 & 710 & 850 & 1200 & 950 \\\hline \text { Scores after course } & 740 & 860 & 840 & 920 & 890 & 720 & 840 & 1240 & 970\end{array}$$

• A)(-30.50, -0.62)
• B)(-20.34, 4.85)
• C)(-10.32, 15.44)
• D)(1.65, 30.59)

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Definitions:

Top-of-Mind Awareness

The first brand or product that comes to a consumer's mind when thinking about a particular industry or category.

Recall

The process of retrieving information or memories from past experience; in a business context, it often refers to a company's request to return a product due to the discovery of safety issues or product defects.

Brand Names

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AIDA Model

A marketing model that outlines the steps of consumer engagement: Attention, Interest, Desire, and Action, guiding marketers in crafting their messaging.