We Are Interested in Comparing the Average Supermarket Prices of Two

question 62

Multiple Choice

We are interested in comparing the average supermarket prices of two leading colas in the Tampa area. Oursample was taken by randomly going to each of eight supermarkets and recording the price of a six -pack ofcola of each brand. The data are shown in the following table. Find a 98% confidence interval for the differencein mean price of brand 1 and brand 2. Assume that the paired data came from a population that is normallydistributed. $$\begin{array} { c | c c | c } \text { Supermarket } & \text { Brand 1 } & \text { Brand 2 } & \text { Difference } \\\hline 1 & \$ 2.25 & \$ 2.30 & \$ - 0.05 \\2 & 2.47 & 2.45 & 0.02 \\3 & 2.38 & 2.44 & - 0.06 \\4 & 2.27 & 2.29 & - 0.02 \\5 & 2.15 & 2.25 & - 0.10 \\6 & 2.25 & 2.25 & 0.00 \\7 & 2.36 & 2.42 & - 0.06 \\8 & 2.37 & 2.40 & - 0.03 \\\hline & \mathrm { x } _ { 1 } = 2.3125 & \mathrm { x } _ { 2 } = 2.3500 & \overline { \mathrm { d } } = - 0.0375 \\& \mathrm {~s} _ { 1 } = 0.1007 & \mathrm {~s} _ { 2 } = 0.0859 & \mathrm {~s} _ { \mathrm { d } } = 0.0381\end{array}$$

• A) (-0.0779, 0.0029)
• B) (-0.1768, 0.1018)
• C) (-0.0846, 0.0096)
• D) (-0.0722, -0.0028)

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Definitions:

Operant Conditioning

A process of learning in which behavior that leads to satisfying consequences is likely to be repeated.

Stimulus Generalization

The process by which a conditioned response is triggered by stimuli that are similar but not identical to the original conditioned stimulus.

Preparedness

A psychological concept referring to the predisposition of individuals to learn certain types of behaviors or concepts more easily than others.

Phobias

An extreme or irrational fear or aversion to something.