Question

The question is: This researcher correctly did the bootstrap and got the approximated sampling distribution. Without seeing his simulation results, can you approximate the mean and the standard deviation of his distribution?

3. In your homework, you worked with a census data on babies born in 1998. For this problem, let's consider all babies born in the December of 1998, and treat them as our population. This is totally reasonab w e are only interested in the characteristics of December babies. not all babies in 1998. The histogram of the birthweight (in grams) and some relevant summary statistics are as follows, Histogram of Birthweight for December Babies 120000 $summary Min. 1st Qu. Median 227 3005 3345 Мах. Mean 3rd Qu. 3312 3686 7995 Frequency 20000 40000 60000 80000 $sd [1] 607.7148 0 6000 B000 2000 4000 Birthweight (in grams)

Answer 1

it is asked to approximate the mean and sd from graph only, not from the summary stats

mean is approx 3300 from graph (it is between 3000 and 3500, the largest peak}

most of data lies between 2000 and 5000
hence 4*sd = 5000 -2000 {95% lies between 2 sd within mean}
sd = 750