Use the following data and ANOVA to test whether there is a significant difference in mean of sales among brands. Use significance level of 5%. Discuss and interpret findings thoroughly. Please show how to do on excel step by step.

Brand 1

2014=6.16

2015= 10.15

2016=13.45

2017=8.48

2018=8.37

Brand 2

2014=11.1

2015= 13.2

2016=13.4

2017=14.2

2018=11.2

Brand 3

2014=3.53

2015= 3.12

2016=3.51

2017=3.56

2018=3.53

Brand 4

2014=28.7

2015= 26.0

2016=23.7

2017=24.6

2018=24