A Researcher Wants to Determine the Efficacy of a Training

question 64

Multiple Choice

A researcher wants to determine the efficacy of a training program directed at improving concentration, focus, and memory on college students.She selects a random sample of 16 individuals and has them take an initial assessment test before the training program.Then the individuals complete the training program, and at the end they take a final test that's comparable to the initial test.The results are shown in the following table: $$\begin{array} { | c | c | c | } \hline \text { Individ. } & \text { Before } & \text { After } \\\hline 1 & 79 & 81 \\\hline 2 & 74 & 73 \\\hline 3 & 81 & 82.5 \\\hline 4 & 75 & 82.5 \\\hline 5 & 72.5 & 85 \\\hline 6 & 75 & 90 \\\hline 7 & 67.5 & 83.5 \\\hline 8 & 57.5 & 72.5 \\\hline 9 & 62.5 & 87.5 \\\hline 10 & 77.5 & 80 \\\hline 11 & 61.5 & 92.5 \\\hline 12 & 57.5 & 80 \\\hline 13 & 61.5 & 71 \\\hline 14 & 72.5 & 84 \\\hline 15 & 64 & 78.5 \\\hline 16 & 71 & 97.5 \\\hline\end{array}$$ The analyst uses a Wilcoxon matched-pairs signed rank test with a 0.05 significance level.The observed z score is ______.

• A)-3.4645
• B)-3.2157
• C)-3.0178
• D)-2.9857
• E)-2.7978

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Definitions:

Different Color

A term referring to the variation in hue, saturation, or brightness among visual elements.

Appointment

An Appointment is a pre-arranged meeting or schedule agreement, often found within calendars and scheduling applications.

Recurring Event

An event that repeats at defined intervals (e.g., daily, weekly, monthly) in calendars or scheduling software, helping to track regular appointments or activities.

Show As

A feature in calendaring and scheduling software allowing users to mark how their status should be displayed during an event (e.g., busy, available).