The CEO of a large railroad company claims that the company's trains arrive in New York city within.

The CEO of a large railroad company claims that the
company's trains arrive in New York city within 1 standard deviation of
official arrival time. To substantiate this claim, the company checked the
arrival time of 10 trains into New York city. From this sample they computed a
standard deviation of 1.8 minutes.

(a). State H_{o} and H_{a}.

(b). In supporting or rejecting this claim, use the
following decision rule:

then the claim is rejected. Find c * for a
Type I error of α = 0.10.

(c). Based on the above decision rule, would the claim be
rejected? Explain.