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Hi,

One of the symbols is missing.

Is it H1: s ≠ 9.3 ?

or H1: s > 9.3

or

H1: s < 9.3

which one?

H_{1}: σ ≠ 9.3

ok.

This is a two tailed test.

yes

degree of freedom = n - 1

= 28 - 1

= 27

We need to use a chi-square table to find the critical points with degree of freedom 27.

a. -40.113, 40.113

The area under the curve of chi-square distribution on the left tail is 0.025 and the one on the right will also be 0.025.

The one on the right is 43.194.

The one on the left is 14.573

The correct choice is d.

thanks!!!!!!!!!

you're welcome.