Question

Construct a 90% confidence interval for σ for the following sample: {12, 13, 12, 11, 15}

a) (.471, 4.562)

b)   (1.665, 8.327)

c) (.985, 3.597)

d)   (2.376, 9.682)

Group of answer choices

Answer 1

sample is given by,

12 , 13 , 12 ,. 11 , 15

Mean = (12+13+12+11+15) /5 = 63/5 = 12.6

Standard deviation

s = ( 9.2 / 4)0.5

= 1.52

90% confidence interval for is given by,

= 9.49

= 0.71

(0.985 , 3.597)

****If you have any queries or doubts please comment below, if you're satisfied please give a like. Thank you!