Currently patrons at the library speak at an average of 66 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 69 people speaking at the library. Their average decibel level was 67.7 and their standard deviation was 13. What can be concluded at the the αα = 0.10 level of significance?

- For this study, we should use Select an answer z-test for a population proportion t-test for a population mean
- The null and alternative hypotheses would be:

H0:H0: ? μ p Select an answer ≠ = < >

H1:H1: ? p μ Select an answer < ≠ = >

- The test statistic ? z t = (please show your answer to 3 decimal places.)
- The p-value = (Please show your answer to 4 decimal places.)
- The p-value is ? > ≤ αα
- Based on this, we should Select an answer fail to reject accept reject the null hypothesis.
- Thus, the final conclusion is that …
- The data suggest the populaton mean has
**significantly**increased from 66 at αα = 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 66 at αα = 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. - The data suggest that the population mean decibal level has not
**significantly**increased from 66 at αα = 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

Currently patrons at the library speak at an average of 64 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 69 people speaking at the library. Their average decibel level was 61.7 and their standard deviation was 6. What can be concluded at the α = 0.05 level of significance?

H0:H0: ? μ p Select an answer > ≠ < =

H1:H1: ? p μ Select an answer = > < ≠

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

Currently patrons at the library speak at an average of 64 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 55 people speaking at the library. Their average decibel level was 58.9 and their standard deviation was 16. What can be concluded at the the αα = 0.01 level of significance?

- For this study, we should use Select an answer t-test for a population mean z-test for a population proportion
- The null and alternative hypotheses would be:

H0:H0: ? p μ Select an answer < > ≠ =

H1:H1: ? μ p Select an answer > ≠ = <

- The test statistic ? z t = (please show your answer to 3 decimal places.)
- The p-value = (Please show your answer to 4 decimal places.)
- The p-value is ? ≤ > αα
- Based on this, we should Select an answer accept reject fail to reject the null hypothesis.
- Thus, the final conclusion is that …
- The data suggest the population mean has not
**significantly**changed from 64 at αα = 0.01, so there is statistically significant evidence to conclude that the population mean decibel level at the library has not changed since the plug in station was built. - The data suggest the populaton mean has
**significantly**changed from 64 at αα = 0.01, so there is statistically significant evidence to conclude that the population mean decibel level at the library has changed since the plug in station was built. - The data suggest that the population mean decibal level has not
**significantly**changed from 64 at αα = 0.01, so there is statistically insignificant evidence to conclude that the population mean decibel level at the library has changed since the plug in station was built.

- The data suggest the population mean has not

Currently patrons at the library speak at an average of 70 decibels. Will this average change after the installation of a new computer plug in station? After the plug in station was built, the librarian randomly recorded 46 people speaking at the library. Their average decibel level was 64.6 and their standard deviation was 11. What can be concluded at the the αα = 0.10 level of significance?

- For this study, we should use Select an answer z-test for a population proportion t-test for a population mean
- The null and alternative hypotheses would be:

H0:H0: ? p μ Select an answer = > < ≠

H1:H1: ? p μ Select an answer < > ≠ =

- The test statistic ? z t = (please show your answer to 3 decimal places.)
- The p-value = (Please show your answer to 4 decimal places.)
- The p-value is ? > ≤ αα
- Based on this, we should Select an answer reject accept fail to reject the null hypothesis.
- Thus, the final conclusion is that …
- The data suggest the populaton mean has
**significantly**changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has changed since the plug in station was built. - The data suggest the population mean has not
**significantly**changed from 70 at αα = 0.10, so there is statistically significant evidence to conclude that the population mean decibel level at the library has not changed since the plug in station was built. - The data suggest that the population mean decibal level has not
**significantly**changed from 70 at αα = 0.10, so there is statistically insignificant evidence to conclude that the population meandecibel level at the library has changed since the plug in station was built.

- The data suggest the populaton mean has

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