Question

Cuestion op In an attempt to identify ecologically friendly methods for controlling mosquito populations, researchers conducted field experiments in a certain country where aquatic nymphs of the dragonfly Brachytron pretense were used against the larvae of mosquitoes. The researchers concluded that Brachytron pretense can be used effectively as a strong, ecologically friendly control of mosquitoes and mosquito-borne diseases. Complete parts (a) through (1) Click the icon to view more information about the experiment A school psychologist wants to test the effectiveness of a new method of teaching French. She recruits 800 fifth-grade students and randomly divides them into two groups. Group 1 is taught by means of the new method, while group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test (graded on a scale from 1-10) is administered and the results of the two groups are compared. Complete parts (a) through (i) below.

Answer 1

2.Sol:

(a)

Response variable is the one which shows the effect which the treatment had on the group receiving it. In this case the response variable is the results achieved on the test.

(b)

Since results are measured using marks, so this makes it a quantitative variable.

(c)

Treatment is the new teaching methodology which is given to one of the groups.

(d)

The control group is the one which does not receive the treatment. So in this case it is the group which is taught using traditional methods.

(e)

This is an independent measures design, as both the groups receive different treatment conditions, randomly.

(f)

There are total 200 subjects in the study.

All the parts have been aswered correctly by you except part (e).

.In this study you conduct a one tailed z-test to assess the significance of the new teaching method.