Proportion

annah0034

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Apr 9, 2015
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My work is in bold below.

Question:
The following two hypotheses are tested:
Ho: The proportion of UF students who have seen a dentist this year is 60%
Ha: The proportion of UF students who have seen a dentist this year is less than 60%
A random sample of 400 UF students is taken and 220 have seen a dentist this year. The test statistic for this hypothesis test is

A.3.06
B.2.04
C.-3.06
D.-2.04
E.-1.02
F.1.02

My work: Finding z-score
p-hat value: 220/400= 0.55
z=.55-.60/square root of .60(1-.60)/220

When I worked out the problem, I got -1.52 which is not listed as a potential answer below.
 
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