Microsoft Office Tutorials and References

In Depth Information

• y-axis title: NUMBER OF GROWTH RINGS

• re-size the chart so that it is 8 columns wide and 25 rows long

• delete the legend

• delete the gridlines

• move the chart below the table

(c) Create the least-squares regression line for these data on the scatterplot and

add the regression equation to the chart.

(d) Use Excel to run the regression statistics to ﬁnd the equation for the

leastsquares regression line for these data and display the results below the chart

on your spreadsheet. Use number format (2 decimal places) for the correlation

and three decimal places for all the other decimal numbers, including the

coefﬁcients.

(e) Print just the input data and the chart so that this information ﬁts onto one

page. Then, print the regression output table on a separate page so that it ﬁts

onto that separate page.

(f) save the ﬁle as: GROWTH4

Now, answer these questions using your Excel printout:

1. What is the correlation coefﬁcient r?

2. What is the y-intercept?

3. What is the slope of the line?

4. What is the regression equation for these data (use three decimal places for the

y-intercept and the slope)?

5. Use the regression equation to predict the NUMBER OF GROWTH RINGS

you would expect for a tree that was 20 years old.

2. Suppose that you wanted to study the relationship between the body weight (X)

and the gill weight (Y) of the crab, Pachygrapsus marmoratus. Body weight

was measured in grams (g) while gill weight was measured in milligrams (mg).

You are interested in determining if a heavier crab would require larger gills in

order to efﬁciently exchange oxygen and carbon dioxide with its environment.

Create an Excel spreadsheet and enter the data using BODY WEIGHT as the

independent (predictor) variable, and GILL WEIGHT as the dependent (criterion)

variable. You decide to test your Excel skills on a small sample of crabs using the

hypothetical data presented in Fig.
6.31
.

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