Writers
Eight Professional Food Writers Have Been Asked to Rate

question 105

Short Answer

Writers
Eight professional food writers have been asked to rate the taste characteristics of a meat dish prepared first by flame grilling and then by charcoal grilling. After each of the dishes is prepared it is rated on a scale from 1 to 5 with 1 being best and 5 being worst. The results of the rating were:
$$\begin{array} { | c | c | c | c c | } \hline \text { Writer } & \text { Flame } & \text { Charcoal } & d _ { i } & \left| d _ { i } \right| \\\hline \text { A } & 5 & 1 & 4 & 4 \\\text { B } & 4 & 2 & 2 & 2 \\\text { C } & 1 & 2 & - 1 & 1 \\\text { D } & 4 & 3 & 1 & 1 \\\text { E } & 3 & 1 & 2 & 2 \\\text { F } & 4 & 4 & 0 & 0 \\\text { G } & 4 & 5 & - 1 & 1 \\\text { H } & 2 & 3 & - 1 & 1 \\\hline\end{array}$$
-The Wilcoxon signed rank test for paired samples is used to test the hypotheses $$H _ { 0 } : m _ { d } = 0 \text { vs. } H _ { 1 } : m _ { d } \neq 0$$ What is the calculated test statistic,W?

Understand the concept of nominal variables and their representation by indicator (dummy) variables.

Recognize when to use indicator variables in multiple regression models.

Identify the appropriate number of indicator variables for nominal variables with various categories.

Interpret the role and effect of indicator variables in regression analysis and model prediction.

---

Definitions:

Demand Schedules

A table that shows the quantity of a good or service that consumers are willing and able to purchase at various prices during a specified period.

Demand Elastic

Describes how sensitive the quantity demanded of a product is to a change in its price.

Total Revenue

The overall amount of money generated by a firm from its sales activities before any costs or expenses are deducted.

Unit Price

The cost per unit of quantity of a product, which allows for easy comparison of cost efficiency between different products or services.