These 74 girls are an srs of all seventh‑grade girls in the school district. suppose that the standard deviation of iq scores in this population is known to be =11 . we expect the distribution of iq scores to be close to normal. the distribution's stemplot is given. 8 6 9 9 0 1 3 3 9 6 7 7 8 10 0 0 2 2 3 3 3 3 4 4 10 5 5 5 6 6 6 7 7 7 7 8 9 11 0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 4 4 4 4 11 5 5 6 8 8 9 9 9 12 0 0 3 3 4 4 12 6 7 7 8 8 8 13 0 2 13 6
select the explanation that best answers whether or not there are departures from normality.
a. there is a departure from normality because the data looks approximately uniform.
b. there is no departures from normality because the data looks approximately bell‑shaped.
c. there is no departures from normality because the data looks approximately right‑skewed.
d. there is no departures from normality because the data looks approximately left‑skewed.
(b) estimate the mean iq score for all seventh‑grade girls in the school district, using a 98% confidence interval.
select an answer choice.
a. 107.44 to 114.02
b. 108.22 to 113.24
c. 108.63 to 112.83
d. 105.84 to 132.00