Search
Create
Log in
Sign up
Log in
Sign up
Psych 311
STUDY
Flashcards
Learn
Write
Spell
Test
PLAY
Match
Gravity
Final Prep
Terms in this set (10)
Which of the following is a major difference between a hypothesis test with the t statistic formula and the test with a z-score?
You must calculate the sample variance (or standard deviation) for the t statistic but not for the z-score. You use the unit normal table to find critical values for the z-score test but not for the t test. You must know the population variance (or standard deviation) for the z-score but not for the t statistic.
On average, what value is expected for the t statistic when the null hypothesis is true?
0
What is measured by the estimated standard error, sM?
How much difference is reasonable to expect between a sample mean and the population mean
A sample of n = 25 individuals is selected from a population with µ= 80, and a treatment is administered to the sample. Which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect?
M = 90 and small sample variance
What is the sample variance and the estimated standard error for a sample of n = 4 scores with SS = 300
s2 = 100 and sM = 5
With α= .01, what is the critical t value for a one-tailed test with n = 30
t = 2.462
A sample has a mean of M = 39.5 and a standard deviation of s = 4.3. In a two-tailed hypothesis test with α= .05, this sample produces a t statistic of t = 2.14. Based on this information, the correct statistical decision is
It is impossible to make a decision about H0 without more information.
A sample of n = 25 scores produces a t statistic of t = -2.05. If the researcher is using a two-tailed test with α = .05, the correct statistical decision is
he researcher must fail to reject the null hypothesis with either α = .05 or α = .01
The results of a hypothesis test are reported as follows: t(29) = 2.70, p < .05. Based on this report, how many individuals were in the sample?
30
As sample variance increases, what happens to measures of effect size such as r2 and Cohen's d
They tend to decrease
;