The mean diameter of thread is expected to be 5 units. A factory tested 16 specimens of thread and found the sample average to be 5.9 units. What is the value of the test statistic you will use knowing that the population variance = 4.0? H0: mu equals 5 Ha: mu equals divided by space 5 space space left parenthesis n o t space e q u a l right parenthesis The mean fineness , of yarn is expected to be greater than the standard value of 5 units. To test this claim, the factory graded 16 specimens of the yarn and found the sample average, x , to be 5.9 units. Assume that the measurement of fineness is normally distributed with a variance of 2 = 4 . H 0: U=5

Ha:u=/5 not equal

1.8

0.225

0.45

3.6