In 1965, the mean price of a new car was $2,650 and the standard deviation was $1,000. In 2011, the mean was $30,500 and the standard deviation was $9,000. If a Ford Mustang cost $2,300 in 1965 and $28,000 in 2011, in which year was it more expensive relative to other cars?
Pilihan jawaban
1965, because the standardized score is greater than in 2011.
1965, because the standard deviation is smaller.
2011, because the standardized score is greater than in 1965.
2011, because $28,000 is greater than $2,300.
We cannot compare the two prices, because we don’t know if the prices for each year are Normally distributed.