A Random Sample of 9 TI-89 Titanium Calculators Being Sold $\begin{array} { l l l l l } \hline 135 & 163 & 152 & 153 & 138 \\\hline 164 & 160 & 149 & 157 & \\\hline\end{array}$

question 12

Multiple Choice

A random sample of 9 TI-89 Titanium calculators being sold over the internet had the following prices, in dollars.
$\begin{array} { l l l l l } \hline 135 & 163 & 152 & 153 & 138 \\\hline 164 & 160 & 149 & 157 & \\\hline\end{array}$
Assume the population standard deviation is ı = 28 and that the population is approximately normal. Construct a 95% confidence interval for the mean price for all the TI-89's being sold over the internet.

• A) (134.0,170.6)
• B) (145.6,159.1)
• C) (145.5,159.2)
• D) (97.5,207.2)

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Definitions:

Consumer Incomes

refers to the total earnings received by consumers, including wages, salaries, benefits, and other income sources, which influence their spending habits and demand for goods and services.

Demand Shift

A change in the quantity demanded at every price due to factors such as consumer preference, income levels, or prices of related goods.

Equilibrium Price

The market price at which the quantity of goods supplied is equal to the quantity of goods demanded, also known as the market-clearing price.

Profit

The financial gain obtained when the amount earned from business activities exceeds the expenses, costs, and taxes needed to sustain the activity.