When is a one-sample z-test used?

When N>= 30 and standard deviation for the population is known

When is a one-sample t-test used

When N< 30 and the population standard deviation is not know

What does effect size measure?

Size/strength of the effect, difference, or relationship

What does the critical value define?

Defines the region for rejecting the null hypothesis

What is a type 1 error

A statistically significant is found when there is no effect

Which is an example of a null hypothesis?

There is no correlation between ice cream consumption and temperature.

When is an independent samples t-test used?

To see if there is a difference between 2 independent groups on their mean

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Exam III

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Answers

1
When is a one-sample z-test used?
When N>= 30 and standard deviation for the population is known
When N= 100 and the Mu is known
When N=100 and the standard deviation for the sample is used
When N< 30 and the mean of the population is known
2
When is a one-sample t-test used
When N< 30 and the population standard deviation is not know
When N= 100 and the Mu is known
When N= 100 and the sample mean is known
When N> 30 and population deviation is known
3
The shaded area is the region of acceptance
False
True
4
What is the critical value for a one-sample z test
+- 1.96
+- 1.86
+- 1.75
+- 2.00
5
Mu is the population mean rather than the sample mean
True
False
6
Which is not a way to minimize the possibility of Type 2 error?
Larger sample size
Larger effect size
Less error in research design
Make alpha value smaller
7
What does effect size measure?
Size/strength of the effect, difference, or relationship
Measures p value
Tells you whether your results are statistically significant
Probability that your hypothesis is true
8
What does the critical value define?
Maximum probability allowed for concluding that an effect exists
Defines the region for rejecting the null hypothesis
Defines the sample size needed for your test
Defined the actual results of your experiment
9
To find Persons r you need the sum of the x and y z-score over N-1
False
True
10
What is a type 1 error
A statistically significant is found when there is no effect
Occurs when sample size is too small
A statistically significant result is not found when there is an effect
Occurs when you repeat an experiment multiple times
11
Which alpha value is normally used in research and is assumed?
a=.05
a=.001
a=.01
a= .005
12
Which is an example of a null hypothesis?
There is no correlation between ice cream consumption and temperature.
Ice cream consumption increases up to a certain temperature, then declines
As temperature increases, ice cream consumption increases.
As temperature increases, ice cream consumption decreases.
13
What is not needed to calculation an independent samples t-test?
Population mean
Mean of group 1
Mean of group 2
SD x-x
14
When is an independent samples t-test used?
When measuring the same group of participants before and after treatment
Used to test more than two groups at once
To see if there is a difference between 2 independent groups on their mean
Used to analyze relationship between two variables
15
Descriptive statistics are used to summarize the results of our study's sample of particioants
True
False
16
Which is NOT a type of probability sampling
Convenience Sampling
Simple random sampling
Nonresponse bias
Stratified random sampling
17
A person r of a 0 shows what
Perfect negative relationship
No relationship
Slight positive relationship
Perfect positive relationship
18
As a skeptical scientist, you always assume that your hypothesis is incorrect
True
False
19
Pearson's r is a statistic used to describe a linear relationship between variables
False
True

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