Claim: Fewer than
94%
of adults have a cell phone. In a reputable poll of
1086
adults,
85%
said that they have a cell phone. Find the value of the test statistic.
The value of the test statistic is
nothing.
Test statistic formula for this test is given as below:
Z = (p̂ - p)/sqrt(pq/n)
Where, p̂ = Sample proportion, p is population proportion, q = 1 - p, and n is sample size
n = sample size = 1086
p̂ = x/n = 0.85
p = 0.94
q = 1 - p = 0.06
Z = (p̂ - p)/sqrt(pq/n)
Z = (0.85 - 0.94)/sqrt(0.94*0.06/1086)
Z = -12.4887
Test statistic = -12.4887
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