Reference no: EM132283279
Engineering Statistics Exam - Multiple Choice Questions
Q1. If you have two data sets one with n1 = 15 and n2 = 32 which test would you use to compare means?
a. Ind. T test
b. Smith-Satterwaithe
c. U test
d. H test
Q2. If you have two data sets one with n1 = 15 and n2 = 17 which test would you use to compare means?
a. Ind. T test
b. Smith-Satterwaithe
c. U test
d. H test
Q3. If you have the data sets one with n1 = 15, n2 = 29, and n3 = 34 which test would you use to compare means?
a. Ind. T test
b. Smith-Satterwaithe
c. U test
d. H test
Q4. The U test uses which distribution to determine the critical value?
a. Z
b. t
c. Chisquared
d. F
Q5. The H test uses which distribution to determine the critical value?
a. Z
b. t
c. Chisquared
d. F
Q6. If either of two data sets are non-normal, the appropriate comparison of means hypotheses test would be?
a. H test
b. Smith-satterwaithe test
c. U test
d. F test
Q7. For the critical value, with a U test where Ha is u1 is not equal to u2 the test is?
a. one sided
b. two sided
c. either a or b
d. neither a nor b
Q8. The critical value, with an H test is?
a. one sided
b. two sided
c. either a or b
d. neither a nor b
Q9. A critical value at alpha = 0.05 for a U test where you are testing to see if the underlying populations are the same or not is?
a. 1.645
b. -1.96
c. 3.841
d. none of the above
Q10. The critical value at alpha = 0.05 for an H test with four data set groups is.
a. 3.841
b. 5.999
c. 7.815
d. 9.488
Q11. Which of the following values describes the amount of variation accounted for with a prediction line?
a. Intercept
b. Coefficient of the slope
c. R squared
d. P value
Q12. Which of the following values represents where the prediction line crosses the y axis?
a. Intercept
b. Coefficient of the slope
c. R squared
d. P value
Q13. Which of the values represents the change in the dependent variable for each additional unit of the independent variable in a prediction line.
a. Intercept
b. Coefficient of the slope
c. R squared
d. P value
Q14. Which of the values represents the degree to which the slope of the prediction line is statistically significant.
a. Intercept
b. Coefficient of the slope
c. R squared
d. P value
Q15. A "good" value for r squared in a physical experiment is?
a. .25
b. .30
c. .70
d. .90
Q16. Which of the following is most likely to be a dependent variable in a regression model?
a. Humidity
b. Wind speed
c. Electrical Consumption
d. Temperature
Q17. Which of the following is most likely to be an independent variable in a regression model?
a. Sales of ice cream
b. Number of incidents of violent crime
c. Number of fleece jackets sold
d. Outside temperature
For 18 to 21, you have non-normal data. Test to see if the populations are equal or not with N1 = 7, n2 = 6, W1 = 42 and w2 = 49.
Q18. What is the variance for the test?
a. 7
b. 49
c. 52
d. none of the above
Q19. What is the mean?
a. 21
b. 24
c. 27
d. none of the above
Q20. What is the critical value for 0.01?
a. +-4.960
b. +-1.645
c. +-2.575
d. none of the above
Q21. The decision for Ho: of identical populations and Ha: of not identical populations at a = 0.01?
a. Cannot reject Ho
b. Reject Ho
c. Either
d. Too close to call
For questions 22 to 24, use the following data for the calculation time for a given number of jobs.
|
Num. of jobs
|
1
|
2
|
3
|
4
|
5
|
|
CPU time
|
2
|
5
|
4
|
9
|
10
|
Q22. What is the approximate value of the intercept using the least squares method?
a. 0
b. 1
c. 2
d. none of the above
Q23. What is the approximate value of the slope using the least squares method?
a. 0.95
b. 1.62
c. 2.00
d. 2.25
Q24. What is the closest predicted time for 7 jobs?
a. 8
b. 12
c. 14
d. 16
For questions 25 to 28, a company claims that its oil dispersion product for contaminated environments is more effective than either no treatment or the existing treatment approved by the U.S. government. Use the data listed below from parts per million contamination to determine whether or not there is evidence to support that the companies claims are in fact true:
No treatment 77, 54, 67, 74, 71, 66
Existing treatment, 49, 52, 69, 47, 56
New treatment 60, 41, 59, 65, 62, 64, 52
Q25. What is the critical value at alpha = 0.01?
a. 3.841
b. 5.991
c. 9.210
d. none of the above
Q26. What is the test statistic?
a. 2.4
b. 4.2
c. 6.7
d. none of the above
Q27. What would your decision be:
a. Cannot reject Ho
b. Reject Ho
c. Either
d. Too close to call
Q28. In terms of effectiveness in English what does this mean?
a. The company is making a false claim
b. The company is making a true claim
c. There is insufficient data to assess
d. I need to take this course again