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22S:008 Final Exam, Dec. 16, 1998 Name:_______________________________
Please circle one. Section: 10:30 or 11:30
Please enter all of your answers on these exam pages. Circle the correct answers for the true-false and multiple
choice questions. There are 29 questions plus one bonus question. The Defective Question Report is supplied
separately.
1. (2 pts.) A statistic is a numerical characteristic of a sample.
A) True B) False
2. (2 pts.) Special causes are individually small, unobserved influences on process results.
A) True B) False
3. (2 pts.) A Binomial distribution has its smallest variability when π = 0.5.
A) True B) False
4. (2 pts.) The results produced by a constant-cause system vary, and may vary over a wide band or a narrow
band.
A) True B) False
5. (2 pts.) A temporary employee would be considered a special cause of variation.
A) True B) False
6. (2 pts.) A Type I error is failing to reject a false null hypothesis.
A) True B) False
7. (2 pts.) Least squares chooses values for the regression coefficients, b0, b1,..., bk, that minimize the sum of
the squared vertical deviations from the response values to the fitted regression equation.
A) True B) False
8. (2 pts.) The units (dollars, pounds,...) for the residual standard deviation are the same as the units for the
response variable.
A) True B) False
9. A probability survey uses double blinding to prevent bias in survey results.
A) True B) False
10. (2 pts.) In fitting a straight line by least squares, the units (dollars, pounds,...) of the slope coefficient, b1, are
the same as the units for the response variable.
A) True B) False
11. (2 pts.) With regard to process improvement: The Pareto Principle states that only a few causes are
responsible for most of the variation.
A) True B) False
12. (2 pts.) A histogram with too many class intervals may fail to show the general shape of a distribution.
A) True B) False
