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Q.2.2

Expert-verified
Found in: Page 703

### The Practice of Statistics for AP

Book edition 4th
Author(s) David Moore,Daren Starnes,Dan Yates
Pages 809 pages
ISBN 9781319113339

# Calculate the expected counts. Show your work

The expected count is,

$\begin{array}{|ccc|}\hline \text{Use Facebook}& \text{Main Campus}& \text{Common wealth}\\ \text{Several times a month or less}& 77.56& 53.44\\ \text{At least once a week}& 220.25& 151.75\\ \text{At least once a day}& 612.19& 421.81\\ \hline\end{array}$

See the step by step solution

The table is

## Step 2: Explanation

The formula to compute the degree of freedom is:

Expected count $=\frac{\text{Row total}×\text{Coloumn total}}{\text{Table total}}$

The expected count is$\begin{array}{|ccc|}\hline \text{Use Facebook}& \text{Main Campus}& \text{Common wealth}\\ \text{Several times a month or less}& \frac{1820×131}{3074}=77.56& \frac{1254×131}{3074}=53.44\\ \text{At least once a week}& \frac{1820×372}{3074}=220.25& \frac{1254×372}{3074}=151.75\\ \text{At least once a day}& \frac{1820×1034}{3074}=612.19& \frac{1254×1034}{3074}=421.81\\ \hline\end{array}$