Instruction 2 -Referring to Instruction 2

question 71

Short Answer

Instruction 2.8
Given below is the stem-and-leaf display representing the amount of detergent used in litres (with leaves in 10ths of litres) in a month by 25 drive-through car wash operations in Auckland.
$$\begin{array} { | l | l | } \hline \text { Stem } & \text { Leaves } \\\hline 9 & 147 \\\hline 10 & 02238 \\\hline 11 & 135566777 \\\hline 12 & 223489 \\\hline 13 & 02 \\\hline\end{array}$$
-Referring to Instruction 2.8,if a percentage histogram for the detergent data is constructed,using '9.0 but less than 9.9 litres' as the first class,the percentage of drive-through car wash operations that use '12.0 but less than 12.9 litres' of detergent would be _________.

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Definitions:

Friedman Test

A method of statistical analysis, non-parametric in nature, designed to reveal differences in treatments through various attempts.

Alternative Hypothesis

In statistical testing, the hypothesis that proposes a difference or effect, contrary to the null hypothesis, suggesting that observations are the result of a real effect.

P-value

In hypothesis testing, the probability of obtaining test results at least as extreme as the results observed, assuming the null hypothesis is true.

Statistical Table

A statistical table organizes and displays data in columns and rows, making it easier to interpret sets of statistical information.