For a 2015 study, Table 7.19 shows software output for evaluating the number of hours of Internet surfing per day by age.

(a) Interpret the reported confidence interval. Can you conclude that one population mean is higher? If so, which one? Explain.

(b) Interpret the reported P-value.

(c) Explain the connection between the result of the significance test and the result of the confidence interval.

TABLE 7.19 Race n Mean StdDev Std Error Mean Teenagers 355 6.13 2.57 0.1456 Retired 1365 4.78 1.80 0.0576 Difference = mu (Teenagers) - mu (Retired)

Estimate for difference : 1.19 95% CI for difference: (1.08, 1.62)

T-Test of difference = 0:

T-value = 9.64, P-value = 0.000