Question

To demonstrate flavor aversion learning (that is, learning to dislike a flavor that is associated with becoming sick), researchers gave one group of laboratory rats an injection of lithium chloride immediately following consumption of saccharin-flavored water. Lithium chloride makes rats feel sick. A second control group was not made sick after drinking the flavored water. The next day, both groups were allowed to drink saccharin-flavored water. The amounts consumed (in milliliters) for both groups during this test are given below.

Amount Consumed by Rats That Were Made Sick (n = 4)	Amount Consumed by Control Rats (n = 4)
4	8
3	12
2	11
5	7

(a) Test whether or not consumption of saccharin-flavored water differed between groups using a 0.05 level of significance. State the value of the test statistic. (Round your answer to three decimal places.)

-4.433

State the decision to retain or reject the null hypothesis.

Retain the null hypothesis. Reject the null hypothesis.

Reject

(b) Compute effect size using eta-squared (η²). (Round your answer to two decimal places.)

??

Answer 1

a)

from above test statistic =-4.431

Reject the null hypothesis

b)

η² =(x1-x2)/Sp =(9.5-3.5)/1.915=3.13