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Psych 295 final

Terms in this set (26)

If an entire population with mu=50 & standard deviation = 10 is transformed into z-scores, then the distribution of z scores with have a mean of what & a std deviation of
0 & 1
What term is used to identify the std deviations of the distribution of sample means
Standard error of M
What happens to the standard error of M as sample size increases
It decreases
Which combination of factors will produce the smallest value for the standard error
A large sample & a small standard deviation
Describe a hypothesis test
An inferential technique that uses the data from a sample to draw inferences about a population
What is a type 1 error
Concluding the treat has an effect on y j it really has no effect (false positive)
What is a type 2 error
Concluding the treatment doesn't have an effect when it really does
As sample size increases what does the value of df do? What about the t district union? What about the critical values of t?
Increases. Becomes more like a normal distribution. The critical values of t get closer to 0.
What set of sample characteristics is most likely to produce a significant t stat
Large sample size & small sample variance
In a single sample t test, what must be true if t=0
The statistical conclusion is retain the null
What additional info is obtained by measuring on an interval scale compared to an ordinal scale
The size of the differences
True or False. A correlational study is used to examine the relationship between 2 variables so that you can determine whether there is a cause & effect relationship
False
True or False. A recent report concluded that participants assigned to regular exercise program had lower depressions scores then participants who weren't allowed to exercise. For this study, the level of depression is the independent variable
False.
True or False. The participants in a research study are classified as high, medium or low self esteem. This classification involves measurement on an ordinal scale
True
True or False. A researcher records the gender of each child born in the county hospital during the month of June. This researcher is using a nominal scale of measurement.
True
True or False. Extreme scores in a distribution are more likely to affect the value of the mean than the median
True
What is nominal data
Categories
What is ordinal data
Order that is meaningful
What is interval data
Zero does not mean zero
What is ratio data
Zero does mean zero
What does a z score tell you
How far a score is from the mean in std deviations
What does alpha level tell you
Probability of a type 1 error
When is a type 1 error possible
If you reject the null
Can you do a t test with nominal data
No
What does the f value tell you
Whether there's a reliable difference between the groups
How can you use the z scores as evidence of a positive or negative correlation.
Z scores with the same signs = positive
With differing signs = negative
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