Testing:
H0:p=0.57
H1:p≠0.57
Your sample consists of 138 subjects, with 77 successes. Calculate
the test statistic, rounded to 2 decimal places
z=_____
solution
this is two tailed test
= x / n = 77/138=0.5580
P0 = 0.57
1 - P0 = 1-0.57=0.43
Test statistic = z
= - P0 / [P0 * (1 - P0 ) / n]
= 0.5580-0.57/ [(057*0.43) / 138]
z= - 0.29
Test statistic = z = -0.29
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