Figure 2.29 shows a dotplot of the arsenic concentrations in Table 2.23. Figure 2.29 Table 2.23 (a)

Question:

Figure 2.29 shows a dotplot of the arsenic concentrations in Table 2.23.

Figure 2.29

0.36 0.84 0.12 0.48 0.24 0.60 0.72 Arsenlc

Table 2.23

0.119 0.118 0.099 0.118 0.275 0.358 0.080 0.158 0.310 0.105 0.073 0.832 0.517 0.851 0.269 0.433 0.141 0.135 0.175

(a) Which measures of center and spread are most appropriate for this distribution: the mean and standard deviation or the five number summary? Explain.
(b) Is it appropriate to use the general rule about having 95% of the data within two standard deviations for this distribution? Why or why not?

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