Question

Currently patrons at the library speak at an average of 69 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 47 people speaking at the library. Their average decibel level was 71.1 and their standard deviation was 12. What can be concluded at the the αα = 0.10 level of significance?

3. The p-value = Incorrect (Please show your answer to 4 decimal places.)

On average, a banana will last 6.7 days from the time it is purchased in the store to the time it is too rotten to eat. Is the mean time to spoil greater if the banana is hung from the ceiling? The data show results of an experiment with 12 bananas that are hung from the ceiling. Assume that that distribution of the population is normal.

6.3, 7.8, 9.1, 5.7, 9.4, 8.9, 6.5, 8.6, 9, 8, 9.4, 6.8

What can be concluded at the the αα = 0.05 level of significance level of significance?

3. The p-value = Incorrect (Please show your answer to 4 decimal places.)

Answer 1

Given:

Sample size = n= 47

Sample mean = 71.1

Standard deviation = s = 12

Hypothesis test:

The null and alternative Hypothesis,

Null Hypothesis, Ho : μ = 69

Alternative Hypothesis, Ha : μ ≠ 69

P-value = 2 P(t>2.502) = 0.0294...(from t table)

P-value is 0.0294