43.A university was interested in examining the overall effectiveness of its onl

Question

43.A university was interested in examining the overall effectiveness of its online statistics course, along with the effectiveness of particular aspects of the course. First, the university wanted to see whether the online course was better than a standard course. Second, the university wanted to know whether students learned best using Excel, using Minitab, or using no statistical package at all. The university randomly selected a group of 30 students and administered one of the different variants of the course (i.e., traditional or online, coupled with one of the software options) to each student. The success of each variant was measured by the students' average improvement between a pre-test and a post-test. How many treatment groups are there in this study? a. 3 b. 4 c. 5 d. 6 e. 7

Explanation / Answer

Ans. - d. 6

Explanation -

Note that the number of treatment groups is equal to the number of possible combinations of the values of the factors. You have two factors here: type of instruction (traditional/online) and software (Excel/Minitab/none).

So, there are 2 values for 'type of instruction' and 3 values for 'software'. Hence the number of treatment groups = 2*3 = 6.

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