Mr. potter’s physical science classes conducted an experiment to determine the density of aluminum. here are the density values each class period came up with: 1st hour = 3.1 g/ml, 2nd hour = 3.05 g/ml, 3rd hour = 1.9 g/ml, 4th hour = 2.35 g/ml, 5th hour = 4.2 g/ml, and 6th hour = 4.0 g/ml. if aluminum’s true density is 2.7 g/ml, how would you group the class values based on accuracy?

a.

group: 1st, 3rd, 5th, and 6th hours, with one recorded decimal place in their values

group: 2nd and 4th hours, with two recorded decimal places in their values

b.

group: 3rd and 4th hours, with values under the true density

group: 1st, 2nd, 5th, and 6th hours, with values over the true density

c.

group: 3rd hour, with a 1 value

group: 4th hour, with a 2 value

group: 1st and 2nd hours, with 3 values

group: 5th and 6th hours, with 4 values

d.

group all classes as accurate

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."