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Highlight cells A4:A6 on your computer screen

Number (click on the down arrow on the right)

Category: number

At the right of the box, change 2 decimal places to 3 decimal places by clicking on

the ‘‘up arrow’’ once

OK

The three ﬁgures should now be in number format, each with three decimals.

Now, click on any blank cell to deselect cells A4:A6. Then, close this ﬁle by

File/Close/Don’t Save (since there is no need to save this practice problem).

You can use these same commands to format a range of cells in percentage

format (and many other formats) to whatever number of decimal places you want

to specify.

1.9 End-of-Chapter Practice Problems

1.

Suppose that you wanted to ﬁnd the mean, standard deviation, and standard

error of the mean for the number of weed (Potentilla) seeds in a sample of

grass seeds (Phleum pratense) as measured by the total number of seeds in a

quarter-ounce sample of grass seeds. This interesting problem is discussed

further in Sokal et al. (
1969
). The hypothetical data appear in Fig.
1.17
.

Fig. 1.17

Worksheet Data for Chap. 1: Practice Problem #1

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