Performance lawn equipment

Question

Case Study:

Statistics

Performance Lawn Equipment

Question 1:What proportion of customers rate the company with "top box" survey responses (which is defined as scale levels 4 and 5) on quality, ease of use, price, and service in the 2012 Customer Survey worksheet? How do these proportions differ by geographic region?

Question 2: What would be a confidence interval for an additional sample of mower test performance an in the worksheet Mower Test?

Question 3: For the data in the worksheet Blade Weight, what is the sampling distribution of the mean, the overall mean, and the standard error of the mean? Is a normal distribution an appropriate assumption for the sampling distribution of the mean?

Question 4: How many blade weights must be measured to find a 95% confidence interval for the mean blade weight with a sampling error of at most 0.2? What if the sampling error is specified as 0.1?

Dealer Satisfaction
Survey Scale:	0	1	2	3	4	5	Sample
North America							Size
2010	1	0	2	14	22	11	50
2011	0	0	2	14	20	14	50
2012	1	1	1	8	34	15	60
2013	1	2	6	12	34	45	100
2014	2	3	5	15	44	56	125
South America
2010	0	0	0	2	6	2	10
2011	0	0	0	2	6	2	10
2012	0	0	1	4	11	14	30
2013	0	1	1	3	12	33	50
2014	1	1	2	4	22	60	90
Europe
2010	0	0	1	3	7	4	15
2011	0	0	1	2	8	4	15
2012	0	0	1	2	15	7	25
2013	0	0	1	2	21	6	30
2014	0	0	1	4	17	8	30
Pacific Rim
2010	0	0	1	2	2	0	5
2011	0	0	1	1	3	0	5
2012	0	0	1	1	3	1	6
2013	0	0	0	2	5	3	10
2014	0	0	1	2	7	2	12
China
2012	0	0	0	1	0	0	1
2013	0	0	1	4	2	0	7
2014	0	0	1	5	8	2	16