Suppose that, based on a sample, the 95%% confidence interval for the mean of a population is (21,37). what is the value of s/√n?
a.4
b.3
c.5
d.2

A. 4

Step-by-step explanation:

s/√n is the sample standard deviation.  95% is approximately between ±2 standard deviations, so the ends of the interval are 4 standard deviations apart.

s/√n = (37 − 21) / 4

s/√n = 4

A.4

Step-by-step explanation:

Based on a sample, the 95%% confidence interval for the mean of a population is (21,37). Therefore, the value of s/√n is 4.

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft