Perform a reliability analysis on the items for Tolerance for Ambiguity. They are labelled ta1 through ta9.
Question:
Perform a reliability analysis on the items for Tolerance for Ambiguity. They are labelled ta1 through ta9.
a. What is the reliability of the scale with all nine items?
b. Interpret this reliability, using the rule of thumb as proposed by George and Mallery (2003, p:231): “α≥0.9 = Excellent, α≥ 0.8 = Good, α≥0.7 = Acceptable, α≥ 0.6 = Questionable, α≥ 0 .5 = Poor, and α_ .5= Unacceptable”.
c. Analyze the Item Total Statistics. Which item(s) would you remove? Why?
d. Re-run the reliability analysis after removing the item(s) identified above. What is the reliability now?
e. Which item(s) would you still remove to improve the reliability? What is the new reliability?
f. We usually run reliability analyses by removing items till we get excellent or good alphas that follow George and Mallory's (2003) rule. What are the items on the most reliable Tolerance of Ambiguity scale have now? What is the biggest drawback of this approach of removing items?
Item Statistics | | ||||||
| Mean | Std. Deviation | N | | |||
ta1 | 3.69 | 1.440 | 313 | | |||
ta2 | 3.02 | 1.506 | 313 | | |||
ta3 | 2.83 | 1.524 | 313 | | |||
ta4 | 2.69 | 1.456 | 313 | | |||
ta5 | 2.79 | 1.448 | 313 | | |||
ta6 | 4.52 | 1.627 | 313 | | |||
ta7 | 4.55 | 1.640 | 313 | | |||
ta8 | 4.15 | 1.755 | 313 | | |||
ta9 | 4.23 | 1.136 | 313 | | |||
Item-Total Statistics | |||||||
| Scale Mean if Item Deleted | Scale Variance if Item Deleted | Corrected Item-Total Correlation | Cronbach's Alpha if Item Deleted | |||
ta1 | 28.77 | 32.506 | .198 | .492 | |||
ta2 | 29.43 | 27.753 | .493 | .388 | |||
ta3 | 29.63 | 29.613 | .356 | .438 | |||
ta4 | 29.77 | 30.013 | .358 | .439 | |||
ta5 | 29.66 | 28.653 | .457 | .405 | |||
ta6 | 27.93 | 32.758 | .131 | .517 | |||
ta7 | 27.91 | 38.398 | -.160 | .610 | |||
ta8 | 28.31 | 27.829 | .374 | .424 | |||
ta9 | 28.23 | 37.939 | -.099 | .561 |
Vector Mechanics for Engineers Statics and Dynamics
ISBN: 978-0073212227
8th Edition
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell