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# Ch09_2 - 0011 0010 1010 1101 0001 0100 1011 Ch 9 Hypothesis...

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4 2 5 1 3 0011 0010 1010 1101 0001 0100 1011 0011 0010 1010 1101 0001 0100 1011 Click to edit Master subtitle style Ch 9: Hypothesis Testing Critical values Unknown variance

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4 2 5 1 3 0011 0010 1010 1101 0001 0100 1011 Critical Value Hypothesis testing decision based on either p value or critical value Critical value based on α Obtained without any information about a sample Critical value is a z or t value that determines your rejection region
4 2 5 1 3 0011 0010 1010 1101 0001 0100 1011 Chapter 9 33 Example: Wal Mart believes Mattel has been sending a toy car that has a mean speed off the target of 5 mph. They would like to test their belief at a level of significance of .05. Assume σ = .2 mph Step 1: Ho: μ = 5 mph H1: μ 5 mph Step 2: α =.05 Step 3: The sample statistic is f8e5 x and the test statistic is the z score.

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4 2 5 1 3 0011 0010 1010 1101 0001 0100 1011 Chapter 9 44 Step 4: The critical z score is Z.025 Zcritical=1.96. Step 5: The decision rule states: If Zcalculated<- 1.96 or Zcalculated > 1.96, reject the null hypothesis.

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Ch09_2 - 0011 0010 1010 1101 0001 0100 1011 Ch 9 Hypothesis...

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