In a study conducted by the mechanical engineering department at a university, the steel rods supplied by two different companies were compared. Ten sample springs were made out of the steel rods supplied by each company, and a measure of flexibility was recorded for each. The data are provided in the accompanying table. Compute both the mean and the variance in flexibility for both company A and company B. Does there appear to be a difference in flexibility between company A and company B?
Click the icon to view the flexibility data.
The mean for company A is
The mean for company B is
(Type integers or decimals. Do not round.)
The variance for company A is
The variance for company B is
(Round to four decimal places as needed.)
Does there appear to be a difference in flexibility between company A and company B?
There to be a difference in flexibility. Company A's sample mean is company B's sample mean, and company A's variance is company B's variance.
Flexibility of Springs
Company A: 9.0 8.1 7.3 8.7 8.2 6.6 8.0 6.1 9.3 6.5
Company B: 11.3 9.6 10.5 10.4 9.8 10.2 11.3 11.0 10.4 10.1