The Multimark company has just put a new product on the market and is interested in the effect of packaging color on sales. Three colors are currently at the study, either red, gold and silver.

A point of sale was randomly selected with an identical layout for three types of packaging.

The number of units sold of this new product with each type of packaging has been recorded for a period of 10 days.

The data is presented in the table opposite

Packaging color
Day	Red	Gold	Silver
1	31	37	34
2	38	33	17
3	26	21	20
4	24	24	29
5	26	42	32
6	28	27	18
7	33	33	19
8	26	32	25
9	34	36	16
10	27	24	34

a) What is the dependent variable? b) Identify the factor whose effect on the dependent variable is to be assessed and how many categories does it have? c) Describe in words the null hypothesis that we want to test in this experiment and specify it in statistical form. d) We also give (image)