Psy 202-Chapter 6
Psy 202-Chapter 6 Psy 202
Popular in Elementary Statistics
Popular in Psychology (PSYC)
This 2 page Class Notes was uploaded by T'Keyah Jones on Tuesday September 20, 2016. The Class Notes belongs to Psy 202 at University of Mississippi taught by Dr. Melinda Redding in Fall 2016. Since its upload, it has received 3 views. For similar materials see Elementary Statistics in Psychology (PSYC) at University of Mississippi.
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Date Created: 09/20/16
September 20, 2016 Elementary Statistics a) Hypothesis Testing Procedure in which data from a sample are used to evaluate a hypothesis about a population Steps 1. Test: Pick the right statistical test 2. Assumptions: Check the assumption of the test 3. List the hypothesis: List the null and alternative hypothesis 4. Decision rules: Find critical values to determine when to reject the null hypothesis 5. Calculation: Calculate the value of the test statistic 6. Interpretation: State results in plain language For z-test, z-scores are critical values b) Single Sample Z-test Used to compare a sample mean to a population mean when the standard deviation of the population is known c) Assumption 1. Random sample 2. Independent observation (within sample, each individual is independent) 3. Dependent variable is normally distributed in the (general) population Example: N= 20 people M= 8.4 words μ= 7 words (population) = 2 words (population) Does this suggest that the memory drug has an effect on memory (the number of words recalled)? d) Step 1 Single sample z-test e) Step 2 1. Random sample= 20 adults 2. Cases are independent 3. Memory is normally distributed f) Step 3 Null hypothesis Alternative hypothesis H0 H1 H 0 μDrug= 7; the drug does not have an effect on memory H 1 μDrug ≠; the drug does have an effect on memory g) Step 4 Reject null or don’t reject null Assume = .05 (default value for class) Alpha level Defines tails of distribution Defines what proportion of distribution to be considered rare Critical region The tail of distribution “Upper critical region” positive “Lower critical region” negative 95% region z= -1.96 to z= +1.96 h) Step 5 z = M-μ z= 8.4 - 7 = 3.13 M 2 √20 Z=3.13 Reject the null i) Step 6 The drug has a statistically significant effect on memory NOTE You CANNOT prove a treatment effect using statistical data
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