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PSYC 218 Exam 2 (25%) Chapters 5 (Z scores), 6 (Probability) and 7 (Probability and the distribution of sample means) Make sure that you are familiar with the following: 1) transforming x values to Z scores 2) transforming Z scores to x values 3) transforming x values from one distribution with a given mean and standard deviation to x values in another distribution with a specified mean and standard deviation (note: this involves an interim step of converting the original x values to Z scores) 4) the difference between probability with respect to: 1) obtaining particular x values from a population 2) obtaining particular sample means from a distribution of sample means that originate from a particular population: 5) be careful when a mean is given in one unit (e.g. hours) and variability in another (e.g. min) that you convert the 2 to the same units 6) know how to use your tables and remember you must be told that a population is normal or the sample size is > 30 to be able to work out the probability of obtaining a particular sample mean accurately