Question

Use the given information to find the number of degrees of​ freedom, the critical values chi Subscript Upper L Superscript 2χ2L and chi Subscript Upper R Superscript 2χ2R​, and the confidence interval estimate of sigma σ.

It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution.

Nicotine in menthol cigarettes 95​% confidence; n=25​, s=0.22m

df= [ ] (type a whole number)

chi Subscript Upper L Superscript 2χ2L= [ ] (round to THREE decimal places as needed)

chi Subscript Upper R Superscript 2χ2R​= [ ] (round to THREE decimal places as needed)

The confidence interval estimate of σ is [ ]mg < σ < [ ]mg (round TWO decimal places as need)

Answer 1

n = 25

s = 0.22

= 0.05

df = 25 - 1 = 24

Confidence interval:

Low Side:

From Table;

Low Side:

High Side:

From Table;

High Side:

So,

Confidence Interval:

0.17 < < 0.31

Answers to questions asked:

df = 24

Confidence Interval:

0.17 < < 0.31