The following data sets list full time police per 100,000 citizens along with homicides per 100,000 citizens for the city of Detroit, Michigan during the period from 1961 to 1973.

a. Construct a double time series graph using a common x-axis for both sets of data.

b. Which variable increased the fastest? Explain.

c. Did Detroit’s increase in police officers have an impact on the murder rate? Explain.

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Year Police 1961 1962 1963 1964 1965 1966 1967 260.35 269.8 272.04 272.96 272.51 261.34 268.89 Homicides 8.6 8.9 8.52 8.89 13.07 14.57 21.36 Table 2.49 Year Police Homicides Table 2.50 1968 1969 1970 1971 1972 1973 295.99 319.87 341.43 356.59 376.69 390.19 28.03 31.49 37.39 46.26 47.24 52.33