Chapter 9: Hypothesis Tests for a Single Population Mean Score: 0/12 0/12 answered Question 6 Currently patrons at the library speak at an average of 62 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 60 people speaking at the library. Their average decibel level was 63.3 and their standard deviation was 9. What can be concluded at the the a = 0.10 level of significance? a. For this study, we should use | Select an answer b. The null and alternative hypotheses would be: Ho: ?v Select an answerv H1: ? Select an answerv c. The test statistic ?v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ?v a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that ... The data suggest that the population mean decibal level has not significantly increased from 62 at a = 0.10, so there is statistically insignificant evidence to conclude that the population mean decibel level at the library has increased since the plug in station was built. The data suggest the populaton mean has significantly increased from 62 at a = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has increased since the plug in station was built. The data suggest the population mean has not significantly increased from 62 at a = 0. 10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has not increased since the plug in station was built. Hint