# Question

Chapter 1 distinguished between two different kinds of samples:

A. Random samples (selected randomly from a clearly defined population)

B. Accidental or convenience samples

a. Which type of sample (A or B) is more commonly reported in journal articles?

b. Which type of sample (A or B) is more likely to be representative of a clearly defined population?

c. What does it mean to say that a sample is “representative” of a population?

A. Random samples (selected randomly from a clearly defined population)

B. Accidental or convenience samples

a. Which type of sample (A or B) is more commonly reported in journal articles?

b. Which type of sample (A or B) is more likely to be representative of a clearly defined population?

c. What does it mean to say that a sample is “representative” of a population?

## Answer to relevant Questions

Briefly, what is the difference between internal and external validity? How do categorical and quantitative variables differ? Look at the standard normal distribution in Figure 1.4 to answer the following questions: a. Approximately what proportion (or percentage) of scores in a normal distribution lie within a range from -2σ below the mean to ...In your own words, what does an SS tell us about a set of data? Under what circumstances will the value of SS equal 0? Can SS ever be negative? What is statistical power? What information is needed to decide what sample size is required to obtain some desired level of power (such as 80%).Post your question

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