Solution :
This is the right tailed test .
The null and alternative hypothesis is
H0 : p =0.39
Ha : p > 0.39
n = 449
x = 206
= x / n =206 / 449 =0.46
P0 = 0.39
1 - P0 = 1 - 0.39 = 0.61
Test statistic = z
= - P0 / [P0 * (1 - P0 ) / n]
= 0.46 - 0.39/ [0.39 * 0.61 / 449]
= 2.989
Test statistic = z = 2.99
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