A producer specifies that the mean lifetime of a certain type of battery is at least 240 hours. A sample of 18 such batteries yielded the following results
Variable N Mean StDev Minimum Q1 Median Q3 Maximum
Lifetime
18 237.06 11.28 218.00 229.50 236.50 243.25 262.00

a)(a) Do the data indicate that the specifications are not being met? Test this claim at 5% level.
(b) What type of error could be made in this case? Describe it in words.
Please help!!

Question

A producer specifies that the mean lifetime of a certain type of battery is at least 240 hours. A sample of 18 such batteries yielded the following results
Variable   N    Mean  StDev  Minimum      Q1  Median      Q3  Maximum
Lifetime 
 18  237.06  11.28   218.00  229.50  236.50  243.25   262.00

a)(a)	Do the data indicate that the specifications are not being met? Test this claim at 5% level. 
(b)	What type of error could be made in this case? Describe it in words.
Please help!!