TABLE 13-10
the Management of a Chain Electronic Store Would

question 126

Multiple Choice

TABLE 13-10
The management of a chain electronic store would like to develop a model for predicting the weekly sales (in thousand of dollars) for individual stores based on the number of customers who made purchases. A random sample of 12 stores yields the following results:
$$\begin{array} { | l | l | } \hline \text { Customers } & \text { Sales (Thousands of Dollars) } \\\hline 907 & 11.20 \\\hline 926 & 11.05 \\\hline 713 & 8.21 \\\hline 741 & 9.21 \\\hline 780 & 9.42 \\\hline 898 & 10.08 \\\hline 510 & 6.73 \\\hline 529 & 7.02 \\\hline 460 & 6.12 \\\hline 872 & 9.52 \\\hline 650 & 7.53 \\\hline 603 & 7.25 \\\hline\end{array}$$
-Referring to Table 13-10, which is the correct null hypothesis for testing whether the number of customers who make purchase affects weekly sales?

• A) H₀ : ?₀ = 0
• B) H₀ : µ = 0
• C) H₀ : ?₁ = 0
• D) H₀ : ?= 0

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Definitions:

Sample Variances

The measure of variability that quantifies the spread of data points in a sample dataset around the mean.

Population Variances

The measure of how data points in an entire population are spread out, calculated as the average of the squared differences from the mean.

Sample Variances

A measure of the spread or dispersion within a set of sample data, calculated as the average of the squared differences from the sample mean.

F-Distribution

A probability distribution used in analysis of variance that helps to determine if the means of several populations are equal.