An Instructor Gives a Test Before and After a Lesson

question 40

Essay

An instructor gives a test before and after a lesson and results from randomly selected students are given below. At the 0.05 level of significance, test the claim that the lesson has no effect on the grade. Use Wilcoxon's signed-ranks test. $$\begin{array} { l l l l l l l l l l l l l l l l } \text { Before } & 54 & 61 & 56 & 41 & 38 & 57 & 42 & 71 & 88 & 42 & 36 & 23 & 22 & 46 & 51 \\\hline \text { After } & 82 & 87 & 84 & 76 & 79 & 87 & 42 & 97 & 99 & 74 & 85 & 96 & 67 & 84 & 79\end{array}$$

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Definitions:

Data Analysis

The process of examining, cleaning, transforming, and modeling data with the goal of discovering useful information, informing conclusions, and supporting decision-making.

24-hour Recall

A dietary assessment method where individuals report all the foods and beverages they consumed in the previous 24 hours.

Nutritional Supplements

Products taken orally that contain one or more ingredients (vitamins, minerals, herbs, or other substances) intended to supplement one's diet.

Nutrition Counselor

A health professional who specializes in providing advice and guidance on diet and nutrition to promote health.