Decay of a radioactive element. Barium-137m is a
Chapter , Problem 2.22(choose chapter or problem)
Decay of a radioactive element. 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.10 In a typical experiment, the radioactivity of a sample of barium-137m is measured for one minute. It is then measured for three additional oneminute periods, separated by two minutes. So data are recorded at 1, 3, 5, and 7 minutes after the start of the first counting period. The measurement units are counts. Here are the data for one of these experiments:11 Time 1 3 5 7 Count 578 317 203 118 (a) Make a scatterplot of the data. Give reasons for thechoice of which variables to use on the x and y axes.(b) Describe the overall pattern in the scatterplot and anystriking deviations from the pattern.(c) Describe the form, direction, and strength of therelationship.(d) Identify any outliers.(e) Is the relationship approximately linear?
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