a-battery-company-claims-that-its-new-phone-battery-lasts-at-least-1212-hours-on

Question

A battery company claims that its new phone battery lasts at least $12$ hours on average. A testing lab gathers a sample of batteries and constructs a $95 percent sign$ confidence interval for the true average battery life:
( $11.3$ hours, $11.9$ hours)
You are given the following null hypothesis:
$H sub 0 colon mu equals 12$ hours
Does the confidence interval suggest that you should reject $H sub 0$ ? Explain your reasoning.

Accepted Answer

Yes, because 1212 is not in the confidence interval, so the company's claim is likely incorrect.

Answer

No, because the interval is close to 1212.

Answer

No, because the sample mean could still be 1212.

Answer

Yes, because the interval is narrow.