Question: Refer figure 7.6 on page 306 .

1. Why are the four graphs in Fig. 7.6(a) all centered al the same place?
2. Why does the spread of the graphs diminish with increasing sample size? How does this result affect the sampling error when you estimate a population mean, \(\mu\), by a sample mean. \(\bar{p} ?\)
3. Why are line graphs in Fig. 7.6 (a) bell shaped?
4. Why do the graphs in Figs, 7.6 (b) and (c) become bell shaped as the sample size increases?

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