The mean birth weight of a sample of 195 boys is 32.7 hg with standard deviation 6.6 hg. Give the lower and upper endpoints of a 95% confidence interval for the mean birth weight of all boys. Round your answer to one decimal place.

Lower end point = 31.8 hg

Upper end point = 33.7 hg

Step-by-step explanation:

We are given the following in the question:

Sample mean, = 32.7 hg

Sample size, n = 195

Alpha, α = 0.05

Standard deviation, s = 6.6 hg

Degree of freedom = n - 1 = 194

95% Confidence interval:  

Putting the values, we get,  

Lower end point = 31.8 hg

Upper end point = 33.7 hg