Answer Happy

A paint company claims that a 4-litres can paint can only cover an area of 25 square meters in an interior wall. A consumer group is preparing a report on the choice of paint for interior walls. One item of interest is what area of the wall is covered by 4 litres of paint. For each brand, they set up twelve walls of new plasterboard and measure the area covered by each of 12 different 4 litre cans of paint. For a particular brand and type, HiLux-Miracle, the results (in square metres) are as follows: 17.6 17.2 21.8 31.0 33.4 19.9 20.5 26.9 27.3 21.8 30.0 29.1 Calculate the sample mean for this sample to three decimal places in form xx.xxx. The sample mean Select the correct null hypothesis (Choose ONLY ONE alternative) Select one: O a. mu = 25 O b. mu = 24.708 O c. mu < 25 O d. mu not equal to 24.708 O e. mu < 24.708 Select the correct alternative hypothesis (Choose ONLY ONE alternative) Select one: O a. mu = 25 O b. mu = 24.708 O c. mu < 25 O d. mu not equal to 24.708 O e. mu < 24.708
If the significance level is 0.05, what is the critical value of the test statistic for this test? You should use the appropriate Excel function to find this critical value. Give your answer to 3 decimal places in the form X.XXX or -X.XXX Answer: Give the value of the test statistic calculated from the sample to 3 decimal places in the form x.xxx or -x.xxx Provide this value based on the data in column A Test statistic calculated from data: Give the p-value for this hypothesis test to 3 decimal places in the form x.xxx p-value: Based on the calculated p-value we conclude Select one: O a. Reject the null hypothesis because p-value is less than 0.05 Retain the null hypothesis because p-value is greater than 0.05 O b. O c. Retain the null hypothesis because p-value is less than 0.05 O d. Reject the null hypothesis because p-value is greater than 0.05