A supplier of high-quality audio equipment for automobiles accumulates monthly sales data on speakers and receiver-amplifier...

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A supplier of high-quality audio equipment for automobiles accumulates monthly sales data on speakers and receiver-amplifier units for 5 years. The data (in thousands of units per month) are shown in the following table. Plot the sales data. Do you see any overall trend in the data? Do there seem to be any cyclic or seasonal effects? Year 1 2 3 4 5 J 101.9 109.0 115.5 F 93.0 98.4 104.5 M J 93.5 93.9 104.9 94.6 99.1 110.7 100.2 112.1 105.1 105.4 117.5 106.4 110.8 111.2 124.4 112.4 115.8 116.0 117.2 130.7 117.5 122.0 110.4 128.1 M A J 105.9 123.8 118.6 124.9 131.8 A supplier of high-quality audio equipment for automobiles accumulates monthly sales data on speakers and receiver-amplifier units for 5 years. The data (in thousands of units per month) are shown in the following table. Plot the sales data. Do you see any overall trend in the data? Do there seem to be any cyclic or seasonal effects? Year 1 2 3 4 5 J 101.9 109.0 115.5 F 93.0 98.4 104.5 M J 93.5 93.9 104.9 94.6 99.1 110.7 100.2 112.1 105.1 105.4 117.5 106.4 110.8 111.2 124.4 112.4 115.8 116.0 117.2 130.7 117.5 122.0 110.4 128.1 M A J 105.9 123.8 118.6 124.9 131.8

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