Suppose Matt wants to test the claim that the mean pulse rate of adult males is equal to 69 bpm, since he expects it to be lower. A random sample of 140 adult males is used and found to have a mean of 68.3 bpm and a standard deviation of 10.7 bpm. Find the value of the test statistic.

Answer: z(s)  = - 0.7740Step-by-step explanation:Normal Distributionsample size  n = 140sample mean 68.3A ne tailed-test to the left from problem statement1.-Test hypothesisH₀           null hypothesis                  μ₀  = 69Hₐ   alternative hypothesis              μ₀  < 692.- To find a value of test statistics  z(s)z(s)  =  [  ( μ  -   μ₀ ) /( σ /√n )z(s)  =  ( 68.3 -  69 ) / (10.7/√140)         ⇒  z(s)  = - 0.7*11.83 /10.7 z(s)  = - 0.7740