Question

1) A researcher is running an experiment on the effectiveness of three different energy drinks. She randomly selects 60 individuals from the population and evenly splits them into three groups, each of which consumes a different energy drink.

a. The null hypothesis for this test is that at least one of the three groups will be different. True or False?

The statistical results of the test are as follows: F(2, 47) = 6.24, p < .05.

b. In the above results, what is the value of degrees of freedom between?

c. The decision was to x. the null hypothesis. What represents x ?

2) A researcher reports the following results for an independent samples t-test: t(78) = 3.28, p > .05. How many total participants were there in the study?

3) The homogeneity of variance assumption in an independent samples t-test means that we assume:

	a.	the variances of the two populations are not equal.
	b.	There is no homogeneity of variance assumption in statistics.
	c.	the variances of the two populations are equal.
	d.	the variances of the two samples are equal.

4) In an experiment comparing two treatment conditions, each participant in an independent-measures t-test would have x.  score(s) and each participant in a paired samples t-test would have y.  score(s). (Note: your answers will be numbers.) What do x and y represent?

Answer 1

1) Using "The statistical results of the test are as follows: F(2, 47) = 6.24, p < .05"

a) P-value is less than 0.05.So, the test statistic is significant and rejects H0. we conlude at least one mean is statiically different.

Yes

b) The degree of freedom between= k-1= 2

c)The null hypothesis of X: X represents independent variables, consumeption of a different energy drink.

2)Independent samples t-test:

The degree of freedom = n-2=78=> n=80

3)Homogenity means the variances are equal for sample groups within each of a population.

The variances of the two populations are equal.