Question 364949
Type the data in excel
25
34
28
27
33
40
23
22
26
33
38
25
22
27
30
32
31
24
22
28
32
34
26
24
35


H0 ; muu = 30
H1 ; muu is not equal to 30 (two tailed)
level of significance 
alpha = 0.05

Now use mega stat for mean vs hypothesized mean option, 
you get these values
Hypothesis Test: Mean vs. Hypothesized Value		
		
	30.000 	hypothesized value
	28.840 	mean Data
	5.145 	std. dev.
	1.029 	std. error
	25  	n
	24  	df
		
	-1.13	 t
	.2708	 p-value (two-tailed)

Decision rule,
as p  > 0.05  we fail to reject H0.
hence the mean break time spent by the employees is 30 minutes.