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Traditional methods that forensic investigators use to determine human age require the dest s a problem for crime scene investigators when the body of the deceased is not available. Press F11 to exit full screen A recently developed DNA-based blood test now enables forensic investigators with only a dr of the person who was bleeding. The test also works on dried bloodstains O even those revealed by a heat-vision camera. This could help detectives reopen cases that went cold years ago. This Excel file Blood Test for Age has data on the DNA-based blood test measurements of 321 volunteer human subjects with known ages from just under 2 to just over 96. We would like to use a linear model to model the relationship between the blood test measurements and human age. A scatterplot of the data with the blood test measurements as the explanatory (x) variable and age as the response (y) variable indicates that a linear model is appropriate. I suggest you create your own scatterplot to verify this and to better understand the data. Question 1. With the blood test measurements as the x variable and age as the y variable, find the slope bj and intercept bo of the least squares prediction line y = bo + bjxblood test measurement (use 2 decimal places). -6.46 slope -28.34 intercept. BASIL RATHBONE NIGEL BRUCE ARTHUR CONAN DOYLE'S Sherlock Holmes SECRET WEAPON Question 2. A wealthy philanthropist well-known in London's high society was murdered in his home. Sherlock Holmes finds a blood-stained golf club in a dumpster 2 blocks from the philanthropist's home. The blood test measurement on the golf club blood has value -14.2. Use the least squares prediction equation to estimate the age of the person whose blood is on the golf club (use 2 decimal places). 63 IV Question 3. Help Holmes solve this murder mystery by calculating a 98% prediction interval for the age of the person whose blood is on the golf club (use 2 decimal places). * lower bound of prediction interval X upper bound of prediction interval Question 4. The murdered wealthy philanthropist was 35 years old. The police chief would like to know if the golf club found by Holmes could possibly be the murder weapon. What should Holmes tell the police chief? (One submission only). The golf club is probably not the murder weapon since it is unlikely that the blood on the golf club is from a person whose age is similar to that of the murdered philanthropist. O A 98% confidence interval will indicate that it is more likely that the blood on the golf club is from the murdered philanthropist. The golf club could be the murder weapon since there is statistically valid evidence that the blood on the golf club is from a person similar in age to the murdered philanthropist. blood test human a....xIs emmVRCLoader (2).dll Show all X
