Question

1. Allison conducted a study with undergraduates from UIC and found statistically significant results suggesting her treatment was effective. She proudly told friend that her results showed that the differences between the two groups in her study was entirely due to the treatment and that there was no sampling error. What would a stats professor say was the biggest issue with her claim?

	a.	statistical significance doesn't tell you whether a treatment has an effect or not
	b.	she used a convenience sample
	c.	sampling error is always present in a study
	d.	there is no issue with her claim

2.The results from a research study indicate that adolescents who engage in more physical activities also tend to report lower depression levels than their peers. The correlation between physical activity and depression levels is an example of a ____.​

	a.	correlation near 0
	b.	positive correlation
	c.	negative correlation
	d.	non-linear correlation

3.If a sample (n = 33) with M = 42 and s = 4 is transformed into z-scores, then the resulting distribution of z-scores will have a mean of                   and a standard deviation of                      

	a.	0 and 4
	b.	There is not enough information to determine this
	c.	0 and 1
	d.	42 and 4

Answer 1