Barium-137m is a radioactive form of the element barium that decays very rapidly. It is easy and safe to use for lab experiments in schools and colleges. In a typical experiment, the radioactivity of a sample of barium-137m is measured for one minute. It is then measured for three additional one-minute periods, separated by two minutes. Thus, data are recorded at one, three, five, and seven minutes after the start of the first counting period. The measurement units are counts transformed using a log transformation. Here are the data for one of these experiments: Time Log of the counts 1 3 5 7 6.35957 5.75890 5.31321 4.77068 Click to download the data in your preferred format. CSV Excel JMP Mac-Text Minitab PC-Text R SPSS TI CrunchIt! Make a scatterplot of these data. Find the correlation r between the log of the counts and time. (Use decimal notation. Give your answer to three decimal places.)