In a time study, the data for the execution time of a machining operation have been collected. 22 data have been collected, which are shown in Table 2. The confidence level defined is 98% and an error of 2% has been defined.

Table 2

Machining times

Cycle	Time	Cycle	Time
	(minutes)		(minutes)
1	0.37	12	0.34
2	0.38	13	0.33
3	0.47	14	0.31
4	0.26	15	0.25
5	0.33	16	0.28
6	0.36	17	0.33
7	0.30	18	0.34
8	0.33	19	0.35
9	0.31	20	0.37
10	0.33	21	0.34
11	0.35	22	0.36

Con base en la informacin proporcionada, determine el tamao correcto de la muestra para que tenga soporte estadstico.