Practice Quiz

DSST Principles of Statistics Exam Prep - Question List

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26.

A biomedical company is studying whether its knee joint replacement is causing nerve damage. After extensive tests, the researchers make an erroneous decision, concluding that the replacement does cause nerve damage. A Type I error is the probability of?

  1. rejecting the alternative hypothesis when it is true
  2. rejecting the null hypothesis when it is true
  3. accepting the null hypothesis when it is true
  4. accepting the alternative hypothesis when it is true
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27.

Quality control at a software production assembly line chooses samples for study from every 25 units produced within the day shift. At the end of a single production cycle, they are expected to analyze 200 units for defects. What is this type of sampling called?

  1. probability
  2. non-probability
  3. convenience
  4. judgment
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28. Data that is weighted toward one end of the numerical range in which it occurs is:
  1. Diverse
  2. Peaked
  3. Overweight
  4. Skewed
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29.

Jason's company manufactures parts for large car producers such as Toyota and Honda. Management at his company is committed to continuous improvement in manufacturing standards and practices through rigorous training. What is the name of this practice?

  1. Kaiser
  2. error-proofing
  3. Kaizen
  4. teamwork
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30.

Executives at a national mining company insist that their employees did not contract lung cancer from occupational pollutants. They develop a regression model that shows 67% of the lung cancers reported are due to other factors such as personal smoking and genetic predisposition. The random error term in the linear regression model indicates:

  1. a numerical estimate of the relationship between the independent and dependent variables
  2. a numerical estimate of factors outside the independent variable
  3. a numerical estimate of factors outside the dependent variable
  4. a numerical estimate of the relationship between the intercept and the slope
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