The amplitudes of the third, fourth, fifth, and sixth harmonics, respectively, of the data in Table 9.7 are 1.4907, 0.5773, 0.6311, and 0.0001 0 F. a. Plot a periodogram for these data. Explain what...

The amplitudes of the third, fourth, fifth, and sixth harmonics, respectively, of the data in

Table 9.7 are 1.4907, 0.5773, 0.6311, and 0.0001⁰F.

a. Plot a periodogram for these data. Explain what it shows.

b. What proportion of the variation in the monthly average temperature data is described by the first two harmonics?