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r_to_t_approximation_Sp08BB_nocolor

# r_to_t_approximation_Sp08BB_nocolor - Steps for Hypothesis...

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1 Steps to Hypothesis Testing r-to-t Approximation Steps for Hypothesis Testing 1. H 1 and H 0 2. Determining the nature of the dependent variable 3. Choosing the appropriate test statistic 4. Setting Type I & Type II error rates 5. Determining sample size 6. Collecting data 7. Conducting appropriate statistical tests 8. Calculate observed effect sizes 9. Decision Making Example Step 1: State the Hypotheses Null Hypothesis: ρ = 0 Research Hypothesis: ρ≠ 0

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2 H 0 = The ratings of the mother’s expressions have no effect on the baby’s movement (r=0) H 1 = The ratings of the mother’s expression have an effect on the baby’s movement. (r 0) The higher the mother’s score on the negative scale, the less forward movement by the baby. #1 Visual Cliff Example #1 Visual Cliff Example • Even though using a directional hypothesis, will still use a 2-tailed distribution • Conservative measure – chance could go in the other direction Step 2: Visual Cliff Example • DV#1: Ratings of mother’s negative expression on a scale of 0 - 6 06 3 Interval! Interval! #2 Visual Cliff Example • DV #2: Measurement of forward movement in centimeters (cm) out of a possible 1,000cm Ratio!
3 Step 3: Chose test statistic •2 DVs •No IV • Interval/Ratio Data Correlation!

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r_to_t_approximation_Sp08BB_nocolor - Steps for Hypothesis...

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