1.E: Introduction (Exercises)
- Page ID
- 7086
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- In your own words, describe why we study statistics.
- Answer:
-
Your answer could take many forms but should include information about objectively interpreting information and/or communicating results and research conclusions
- For each of the following, determine if the variable is continuous or discrete:
- Time taken to read a book chapter
- Favorite food
- Cognitive ability
- Temperature
- Letter grade received in a class
- For each of the following, determine the level of measurement:
- T-shirt size
- Time taken to run 100 meter race
- First, second, and third place in 100 meter race
- Birthplace
- Temperature in Celsius
- Answer:
-
- Ordinal
- Ratio
- Ordinal
- Nominal
- Interval
- What is the difference between a population and a sample? Which is described by a parameter and which is described by a statistic?
- What is sampling bias? What is sampling error?
- Answer:
-
Sampling bias is the difference in demographic characteristics between a sample and the population it should represent. Sampling error is the difference between a population parameter and sample statistic that is caused by random chance due to sampling bias.
- What is the difference between a simple random sample and a stratified random sample?
- What are the two key characteristics of a true experimental design?
- Answer:
-
Random assignment to treatment conditions and manipulation of the independent variable 9
- When would we use a quasi-experimental design?
- Use the following dataset for the computations below:
\(\mathrm{X}\) | \(\mathrm{Y}\) |
---|---|
2 | 8 |
3 | 8 |
7 | 4 |
5 | 1 |
9 | 4 |
- \(\sum \mathrm{X}\)
- \(\sum \mathrm{Y}^2\)
- \(\sum \mathrm{XY}\)
- \((\sum \mathrm{Y})^2\)
- Answer:
-
- 26
- 161
- 109
- 625
- What are the most common measures of central tendency and spread?