An experiment was conducted to determine an effective method for removing stains from antique paper.Four methods were considered: sunlight, bleach, peroxide and lemon juice.Each method was applied to 10 pieces of identically stained paper, then the brightness of the paper was recorded.Higher numbers indicate brighter paper (i.e., better stain removal).

Does it appear that the brightness follows a normal distribution for each of the four methods?Provide the p-value(s) of the test(s) you use to make this decision.

Does it appear that all four brands have the same variance of drying time?Explain what part of the Minitab output you use to make this decision.

Based on your answers to questions 22 and 23, would it be appropriate to use analysis of variance on this data set?

Write the null and alternative hypotheses that will be used to determine if all four methods have the same mean brightness.

What are the p-value and the test statistic for the test in Question 25?

(Please enter the values exactly as they appear in the Minitab output.)

Based on the test in Question 26, is the following statement true or false: "We conclude that the mean brightness is the same for all four of these methods."

(Use significance level 0.05.)

Which methods have statistically similar mean brightness?

Which methods statistically different mean brightness?Explain what you see in the Minitab output to answer this question.