To find an approximation of the mean or median, draw a

Chapter 6, Problem 6CTC

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QUESTION:

Sometimes a researcher must decide whether a variable is normally distributed. There are several ways to do this. One simple but very subjective method uses special graph paper, which is called normal probability paper. For the distribution of systolic blood pressure readings given in Chapter 3 of the text, the following method can be used:

To find an approximation of the mean or median, draw a horizontal line from the 50% point on the y axis over to the curve and then a vertical line down to the x axis. Compare this approximation of the mean with the computed mean.

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QUESTION:

Sometimes a researcher must decide whether a variable is normally distributed. There are several ways to do this. One simple but very subjective method uses special graph paper, which is called normal probability paper. For the distribution of systolic blood pressure readings given in Chapter 3 of the text, the following method can be used:

To find an approximation of the mean or median, draw a horizontal line from the 50% point on the y axis over to the curve and then a vertical line down to the x axis. Compare this approximation of the mean with the computed mean.

ANSWER:

Step 1 of 3

Our goal is :

We need to compare this approximation of the mean with the computed mean.

Consider the data.

\(\begin{array}{|c|c|} \hline \text { Class lower limit } & \text { Frequency } \\ \hline 89.5-104.5 & 24 \\ \hline 104.5-119.5 & 62 \\ \hline 119 \cdot 5-134.5 & 72 \\ \hline 134.5-149.5 & 26 \\ \hline 149.5-164.5 & 12 \\ \hline 164.5-179.5 & 4 \\ \hline \end{array}\)

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