Question: Currently patrons at the library speak at an average of 67 decibels. Will this average increase after the installation of a new computer plug in

Currently patrons at the library speak at an average of 67 decibels. Will this average increase after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 63 people speaking at the library. Their average decibel level was 68.1 and their standard deviation was 8. What can be concluded at the the = 0.01 level of significance?

The test statistic t = (please show your answer to 3 decimal places.)
The p-value = (Please show your answer to 4 decimal places.)

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