Amanufacturing firm claims that the batteries

used in their electronic games will last an average of

30 hours. to maintain this average, 16 batteries are

tested each month. if the computed t-value falls between

? t0.025 and t0.025, the firm is satisfied with its

claim. what conclusion should the firm draw from a

sample that has a mean of x = 27.5 hours and a standard

deviation of s = 5 hours? assume the distribution

of battery lives to be approximately normal.