26. Refer to Example 6.11. For the 15 feinale infants, Table 6.9 shows an SPSS printout for the data on the change in heart rate.

a) Explain how to interpret all the results in this table.

b) Explain how to test whether the true mean is 0. Report the P-value for (i) a one-sided alternative of a positive mean change, (ii) two-sided altemative, interpreting in each case.

TABLE 6.9 Number Variable CHANGE Mean of Cases 15 Mean 10.70 SD 17.70 SE of Mean 4.570 95% CI Lower 10.70 .698 Upper 20.501 t-value df 2.341 14 2-Tail Sig .0346