**1. When you follow the scientific method, which step would occur after testing the hypotheses through experimentation?**

- Communicate the results of the process.
**Analyze data from an experiment to draw a conclusion.**- Ask a question about an observation.
- Perform research.

**2. What is the most commonly used statistical method for analyzing data?**

**regression analysis**- mean estimation
- mean analysis
- sample proportion

**3. If the results of a study do not align with previous studies, what question should an evaluator ask?**

- Are there any experts that disagree with the findings?
- Who paid for the research study?
**Can the study be replicated to verify the findings?**- Did the study have an appropriate sample size?

**4. In a linear regression, which variable is also known as the target or response variable?**

- independent
- predictor
- first
**dependent**

**5. When a number of items are grouped together, which type of machine learning algorithm can determine which items in the group predict the presence of other items?**

- clustering
- classification
- regression
**association**

**6. What is the goal of linear regression?**

**to compute a line the interpolates the data, and which can be expressed as a weighted average of the predictor variables and any other function**- to provide a formula that does not require validation
- to provide a summary of the data
- to construct a flow chart

**7. What are two types of supervised machine learning algorithms? (Choose two.)**

- mean
- clustering
**regression****classification**- association
- mode

**8. What type of error has occurred when a data scientist records a measurement incorrectly after viewing the correct value on the measuring device?**

- systematic
**gross**- random
- instrumental

**9. Which type of regression analysis is often used to model variables that have an exponential relationship?**

- mean
- polynomial
- median
**nonlinear**

**10. Which type of information can distort the results of an analysis and careful consideration should be given to their removal from a data set?**

- z-axis
**outliers**- units of measurement
- azimuth

**11. When is an experiment considered reliable?**

- if someone else can modify the experiment and achieve the same conclusions
- if someone else can modify the experiment and achieve similar conclusions
**if someone else can repeat the experiment and find the same conclusion**- if someone else can repeat the experiment and find different conclusions

**12. Refer to the exhibit. What is the purpose of the blue sphere?**

- to display the mean
**to indicate data clusters**- to measure true error
- to categorize historical data

**13. A researcher has measured the reliability of a test using the parallel-forms method. What is the expected result of this measurement?**

**How similar are the scores of two different tests that are created from the same content domain?**- What is the variation of scores for different items in the same test?
- How much variation exists between scores for the same person taking a test multiple times?
- How similarly do different people score on the same test?

**14. Which type of machine learning algorithm uses data sets verified by experts as its learning basis?**

**supervised**- clustering
- routing
- association

**15. Which type of reliability would a scientist measure if the scientist wants to examine the variation between exam scores for a person taking a single test multiple times?**

- internal consistency
- inter-rater
**test-retest**- parallel-forms