Electrobat, a battery manufacturer, is investigating how storage temperature affects the performance of one of its popular
Question:
Electrobat, a battery manufacturer, is investigating how storage temperature affects the performance of one of its popular deep-cell battery models used in recreational vehicles. Samples of 30 fully charged batteries were subjected to a light load under each of four different storage temperature levels. The hours until deep discharge (meaning ≤ 20% of charge remaining) was measured. A portion of the data is shown in the accompanying table.
0 degrees F30 degrees F60 degrees F90 degrees F
3......................6.........................12...........................12
5......................8.........................13...........................15
⋮.......................⋮...........................⋮..............................⋮
4......................9.........................9.............................15
a. Use Excel to generate the appropriate ANOVA table at the 5% significance level.
b. At the 5% significance level, what is the conclusion of the test? What about the 1% significance level?
c. If significant differences exist, use Tukey's HSD method at the 5% significance level to determine which temperature levels have different mean discharge times.
Step by Step Answer:
Business Statistics Communicating With Numbers
ISBN: 9780078020551
2nd Edition
Authors: Sanjiv Jaggia, Alison Kelly