Unformatted text preview: Test for a Single Population Proportion
Hypothesis Test for Diﬀerence in Two Population Proportions Step 3
z ≈ −3.27
p − value z ≈ 0.005
If 90% of all Chinese restaurants fail after one year and if
another sample is observed,
there is a 0.1% chance of getting a sample proportion less
than 81%.
0.1% is a very small chance. Hypothesis Testing for Population Proportions Hypothesis Testing for Population Proportions Steps in Conducting a Hypothesis Test
Hypothesis Test for a Single Population Proportion
Hypothesis Test for Diﬀerence in Two Population Proportions Step 4 Since pvalue ≈ 0.0005 < 0.05
reject H0 and accept Ha.
There is statistically signiﬁcant evidence to support the
claim that the percent of Chinese restaurants that fail
after one year is diﬀerent from 90%. Hypothesis Testing for Population Proportions Hypothesis Testing for Population Proportions Steps in Conducting a Hypothesis Test
Hypothesis Test for a Single Population Proportion
Hypothesis Test for Diﬀerence in Two Population Proportions Review the Learning Goals Know how to test hypotheses concerning a population
proportion
Understand the meaning of pvalue and how it is used.
Understand the meaning of signiﬁcance level and how it is
used.
Know the conditions required for calculating a pvalue
and signiﬁcance level. Hypothesis Testing for Population Proportions Hypothesis Testing for Population Proportions Steps in Conducting a Hypothesis Test
Hypothesis Test for a Single Population Proportion
Hypothesis Test for Diﬀerence in Two Population Proportions Comparing two proportions  Step 1  Hypotheses Twotailed
H0 : p1 = p2
Ha : p1 = p2 Lefttailed
H0 : p1 = p2
H0 : p1 < p2 Righttailed
H0 : p1 = p2
H0 : p1 > p2 Hypothesis Testing for Population Proportions Hypothesis Testing for Population Proportions Steps in Conducting a Hypothesis Test
Hypothesis Test for a Single Population Proportion
Hypothesis Test for Diﬀerence in Two Population Proportions Step 2  Prepare Select the test statistics
Check the conditions and assumptions
Select a sig...
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 Spring '08
 Ioudina
 Statistics, Null hypothesis, Statistical hypothesis testing, Zobserved

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