To demonstrate flavor aversion learning (that is, learning to dislike a flavor t

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.

(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.)

State the decision to retain or reject the null hypothesis.

Retain the null hypothesis.
OR Reject the null hypothesis.

(b) Compute effect size using eta-squared (2). (Round your answer to two decimal places.)
2 =

Amount Consumed
by Rats That Were
Made Sick (n = 4) Amount Consumed
by Control Rats
(n = 4) 5 12 2 8 4 11 3 7 To demonstrate flavor aversion learning (that is, earning 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 Amount Consumed by Rats That Were by Control Rats Made Sick (n 4) (n 4) 11 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. 8.51 State the decision to retain or reject the null hypothesis. O Retain the null hypothesis. O Reject the null hypothesis. (b) Compute effect size using eta-squared (ne). Round your answer to two decimal places m2 1.54 You may need to use the appropriate table in Appendix B to answer this question.

Explanation / Answer

(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.)

Here, we have to use the two sample t test for the population mean.

H0: µ1 = µ2 versus Ha: µ1 µ2

We are given alpha = 0.05

Test statistic = t = (X1bar – X2bar) / sqrt[(S1^2/N1)+(S2^2/N2)]

For the given data, we have

Group Statistics

Rats

N

Mean

Std. Deviation

Std. Error Mean

Amount Consumed

Rats that were made sick

4

3.5000

1.29099

.64550

Control Rats

4

9.5000

2.38048

1.19024

Test statistic = t = (3.5 – 9.5)/sqrt[(1.29^2/4)+(2.38^2/4)]

Test statistic = t = -4.433

State the decision to retain or reject the null hypothesis.

Here, df = 4+4 – 2 = 8 – 2 = 6

P-value = 0.004

Alpha value = 0.05

P-value < Alpha value

So, reject the null hypothesis.

(b) Compute effect size using eta-squared (2). (Round your answer to two decimal places.)
2 =

Effect size = (X1bar – X2bar)/Spooled

Spooled = sqr(((4-1)*1.29^2+(4-1)*2.38^2)/(4+4-2)) = 1.914223

Effect size = (9.5 – 3.5) / 1.914223 = 3.13443

Group Statistics

Rats

N

Mean

Std. Deviation

Std. Error Mean

Amount Consumed

Rats that were made sick

4

3.5000

1.29099

.64550

Control Rats

4

9.5000

2.38048

1.19024

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.