STATISTICS 296 FINAL EXAM STUDY SET UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

STATISTICS 296 FINAL EXAM STUDY SET UPDATED
ACTUAL QUESTIONS AND CORRECT ANSWERS

Question:
1. Categorical Variable
Answer:
divides the cases into groups, placing each case into exactly one of two or more categories

Question:
2. Quantitative Variable
Answer:
measures or records a numerical quantity for each case

Question:
3. Statistical Inference
Answer:
The process of using data from a sample to gain information about the population

Question:
4. Sampling Bias
Answer:
occurs when the method of selecting a sample causes the sample to differ from the population in some
relevant way

Question:
5. Simple random sample
Answer:
When all groups of size n in the population have the same chance of being selected

Question:
6. What can one say about the sampling distribution of a sample statistic based on a simple random
sample?
Answer:
It is about bell-shaped, symmetric, and peaks above the parameter.

Question:
7. What does it mean when the results of a certain test were "statistically significant"?
Answer:
It means that results as extreme as the observed sample statistic are unlikely to occur by random chance
alone (*assuming the null hypothesis is true*)

Question:
8. Which are the correct null and alternative hypothesis for the following situation? Testing to see if there
is evidence that the correlation between two variables is positive.