HYPOTHESIS TESTING A Spring 2016 OBJECTIVES v Be
HYPOTHESIS TESTING (A) Spring 2016
OBJECTIVES v Be able to determine the null and alternative hypothesis. v Be able to conduct hypothesis tests of the population mean and proportion. v Be able to interpret hypothesis test results in terms of the test.
I. DETERMINE THE NULL AND ALTERNATIVE HYPOTHESIS Typical phrases for null hypothesis • “It is known that…” • “Previous research shows…” • “The company claims that…” • “A survey showed that…” Typical phrase for alternative hypothesis • “Is it reasonable to conclude…” • “Is there enough evidence to substantiate…” • “Does the evidence suggest…” • “Has there been a significant…”
I. DETERMINE THE NULL AND ALTERNATIVE HYPOTHESIS (CONT. )
I. DETERMINE THE NULL AND ALTERNATIVE HYPOTHESIS (CONT. )
II. STEPS OF HYPOTHESIS TESTING
STEPS OF HYPOTHESIS TESTING
DECISION RULESCRITICAL VALUE Critical Value
DECISION RULESCRITICAL VALUE Critical Value
DECISION RULESCRITICAL VALUE Critical Value
CRITICAL VALUES Test Two-tailed Critical values Excel command NORM. S. INV(1 -α/2) T. INV(1 -α/2, df) Right-tailed NORM. S. INV(1 -α) T. INV(1 -α, df) Left-tailed NORM. S. INV(α) T. INV(α, df)
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