EXAM 2 REVIEW SHEET PART CHAPTER 8 & PART CHAPTER 12: DISTRIBUTION OF SAMPLE MEANS Understand conceptually the distribution of sample means (DSM) Understand conceptually the Standard Error of the mean and how it is different from the standard deviation Understand the Central Limit Theorem Know the mean (eIf you want to learn more check out aphiany
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xpected value), standard deviation & shape of the DSM Understand the meaning of the standard error as a measure of chance Know what factors influence the size of the standard error and how Know how to compute the probability associated with a particular X Know how to compute the probability associated with a particular X CHAPTER 8: HYPOTHESIS TESTING Understand the general logic of hypothesis testing Know the steps involved in hypothesis testing Understand the null hypothesis (H0) and the alternative hypothesis (H1) Know how to write H0 and H1 for a onesample ztest What is a critical value? Understand the difference between onetailed and twotailed tests What is the alpha level (α) or “level of significance”? Understand a “pvalue” Probability of Type I error (α) Probability of Type II error (β) Level of Confidence (1 α) Power (1 β) Understand the concepts of Type I Error and Type II Error How do we minimize Type I error (and increase “level of confidence”)? How do we minimize Type II error (and increase “power”)? Know how to conduct & interpret a ztest for one sample mean (1tailed and 2tailed) Know how to report the results of a ztest for one sample mean ONESAMPLE TTEST (CHAPTER 12) s ) Estimated standard error of the mean ( x tratio Degrees of freedom (df) When should we use a onesample ttest instead of a onesample ztest? Know the properties of the sampling distribution of t In what ways is the t distribution similar to & different from the standard normal curve (z distribution)? Know how to write H1 & H0 for a onesample ttest Know how to conduct a onesample ttest (1tailed & 2tailed) Know how to report the results of a onesample ttest in APA format RELATED SAMPLES TTEST (CHAPTER 13) Repeated measures design vs. Matched samples design Difference score (D) Standard error of D (s D ) Know the advantages & disadvantages of using a repeatedmeasures design Know how to write H0 & H1 for a relatedsamples ttest Know how to conduct a relatedsample ttest (1tailed & 2tailed) Know how to report the results of a relatedsamples ttest in APA format THE TTEST FOR TWO INDEPENDENT SAMPLES (CHAPTER 14) s − ) Estimated standard error of the difference between 2 independent sample means ( x1x2 Pooled variance estimate (sp2) Know how to write H0 & H1 for a 2 independent samples ttest Know how to conduct a ttest for 2 independent sample means (1tailed & 2tailed) Know how to report the results of a ttest for 2 independent sample means in APA format What are the assumptions of the ttest for 2 independent samples and when are violations of these assumptions “serious”? THE BIG PICTURE Know how to read a research description & select (& conduct) the appropriate statistical test!!!! Be prepared to interpret SPSS output PLEASE BRING THE FOLLOWING TO THE EXAM: ∙ Pencil, eraser ∙ Calculator (nongraphing)—NO PDAs or cell phones may be used as calculators Be sure you are comfortable using all the formulas listed on the formula sheet!