Study Guide for Second Test

**You will need to use **Excel ** to calculate mean, mode, median, and standard deviation. You will also need the t test spreadsheet, the **

**Sample Size Calculator, and the Area Under the Normal Curve Calculator)**

**35 Questions — 36 points possible (raw score)**

** Normal Curve and Standardized Scores** (9 questions)

Calculate the mean, mode, median, and standard deviation (sample and population) using Excel

Calculate standardized scores (

*z*and IQ)

Understand the characteristics of the normal curve

Calculate the area under the normal curve (use Area Under the Normal Curve website)

** Sampling** (8 questions)

Understand the importance, bias, and steps in sampling

Identify simple random, stratified random, systematic, and cluster random sampling

Use a random number table

Determine sample size (use Sample Size Calculator website)

Determine confidence interval (use Sample Size Calculator website)

** Internal and External Validity** (3 questions)

Understand the relationship between internal and external validity and generalization

Identify threats to internal and external validity

* Group Comparison Designs* (3 questions)

Identify R O X O designs

Know the difference between true experimental, quasi-experimental (match-only, counterbalanced, and time-series), and causal-comparative (ex post facto) study designs

** t-tests** (5 questions)

Write the null, alternative, and research answer for a

*t*test

Run a

*t*test and know whether to read the equal or unequal variance

*t*test

Understand how mean differences, standard deviations, and sample sizes influence

*p*

Identify independent and dependent variables

Interpret the results of a mean table for a

*t*test

** Types of Stats** (3 questions)

Identify paired

*t*test, independent

*t*test, chi-square, ANOVA, correlation, and regression test results

** Variables** (2 questions)

Identify independent and dependent variables

** Survey Research** (2 questions)

Cross-sectional, longitudinal (panel, cohort, trend)