Question 1

0.5 pts

Match each term with its definition/description.

Group of answer choices

Between subjects design

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Within subjects design

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[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Individual differences

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Matching

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Random assignment

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Restricted random assignment

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

Attrition

[ Choose ]

experimental design with different groups of people for each condition

experimental design with the same group of people in both conditions.

a random process is used to assign participants to groups

personal characteristics that differ from one participant to another

when a particiapant withdraws from a study before it is completed

a random process is used to assign participants to groups in such a manner that the groups will have equal sizes

assign individuals to groups such that they are balanced as much as possible for a particular variable.

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Question 2

0.5 pts

__________ is when the control group learns what the treatment group is receiving and wants that same treatment.

Group of answer choices

Non-systematic bias

None of the above/below

Hickson Confound

Dynamic kurtosis

Diffusion

Compensatory equalization

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Question 3

0.5 pts

In _________ there is only one independent variable and it has only two levels.

Group of answer choices

Two-group design

Single factor multiple-group design

Factorial design

Between subjects design

Within subjects design

Longitudinal design

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Question 4

0.5 pts

In _________ there is only one independent variable and it has only more than levels.

Group of answer choices

Two-group design

Within subjects design

Factorial design

Longitudinal Design

Single factor multiple-group design

Between subjects design

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Question 5

0.5 pts

John is testing if cocaine causes increased locomotor activity. He gives 4 rats a dose of cocaine, and another 4 rats a placebo injection. Then he measures locomotor activity compares the two different groups of rats. What type of design is John using?

Group of answer choices

Between subjects Two-group design

Within subjects factorial design

Within subjects multiple-group design

Between subjects factorial design

Within subjects Two group design

Between subjects multiple-group design

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Question 6

0.5 pts

____________ is one of the largest and ever-present concerns with a between subjects design.

Group of answer choices

Artifact bias

Between treatment variance

Individual differences and assignment bias

None of the above/below

Carry over effects

Holding extraneous variable constant

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Question 7

0.5 pts

When using a between subjects design, one needs to be concern about/aware of the following aspects:

Group of answer choices

Differential attrition

Communication between the groups

All of the above/below

Assignment bias

Individual differences

Minimizing Variance within treatments

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Question 8

0.5 pts

When you have a between subjects, two-group design and you want to compare the mean values you need to use which statistical test?

Group of answer choices

Dependent samples/repeated measrues t-test

Pearson correlation

Chi squared goodness of fit

Independent samples t-test

Spearman correlation

Multiple regression

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Question 9

0.5 pts

_________ are scores from unique participants that are not statistically dependent on another participants scores.

Group of answer choices

None of the above/below

Statistical Scores

Difference Scores

Pearson Scores

Quasi Scores

Independent Scores

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Question 10

0.5 pts

Select the correct null hypothesis for a two tailed independent samples t-test.

Group of answer choices

μ1 > μ2

μ1 < μ2

μ ≠ 0

μ = 0

μ1 = μ2

μ1 ≠ μ2

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Question 11

0.5 pts

The relationship between within group variance and power can best be described as:

Group of answer choices

As variance increases power decreases

As variance increases power does not change

As variance increases power increases

None of the above/below

As variance increases power first decreases then increases

As variance increases power first increases then decreases

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Question 12

0.5 pts

The relationship between effect size and power can best be described as:

Group of answer choices

As effect size increases power first increases then decreases

As effect size increases power first decreases then increases

As effect size increases power does not change

As effect size increases power decreases

As effect size increases power increases

None of the above/below

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Question 13

0.5 pts

] The estimated standard error of the mean difference can be interpreted as:

Group of answer choices

How big of a difference we should expect between two sample means coming from the same population on average

How big of a difference we should expect between a sample statistic and a population parameter

How big of a difference we should expect between a population mean and a sample mean on average

None of the above/below

The rate of change between the gamma coefficient and the phi coefficient

How big of a difference we should expect between the sample standard deviation and the population standard deviation on average

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Use the following information to answer the remainder of the questions. Abner is conducting research on the effects of note taking methods on learning. He assigns 15 people to take verbatim notes on a lecture, and then a different 15 people to take generative notes where they have to summarize the content on the same lecture. Then he examines the scores of his two different groups on a multiple choice test over the lecture. He finds that the verbatim notes group has a mean of 29.87 and a sum of squares of 703.33. The generative notes group has a mean of 43.4 and a sum of squares of 471.6. Conduct an independent samples t-test for Abner with a two tailed alpha level of .01.

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Question 14

0.5 pts

What is Abner’s pooled variance (error margin = 0.5)?

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Question 15

0.5 pts

What are the degrees of freedom for the verbatim notes group (error margin = 0.1)?

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Question 16

0.5 pts

What are the degrees of freedom for the entire independent samples t-test (error margin = 0.1)?

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Question 17

0.5 pts

What is Abner’s estimated standard error of the mean difference (use the pooled variance method; error margin = 0.3)?

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Question 18

0.5 pts

What is the absolute value of Abner’s critical values (error margin = 0.1)?

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Question 19

0.5 pts

What is the absolute value of Abner’s observed test statistics (i.e., his t observed; error margin = 0.5)?

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Question 20

0.5 pts

How should Abner report his results?

Group of answer choices

The verbatim notetaking group did not score significantly lower (M=20.9, SD =7.1) than the generative notetaking group (M=43.4, SD = 5.8) on the multiple-choice exam, t(28)=5.7, p>.01. This result suggests taking generative notes improves learning.

There was not a significant difference between the generative notetaking group generative notetaking group (M=43.4, SD = 5.8) and the verbatim notetaking group (M=20.9, SD =7.1), t(14)=1.52 , p<0.5.

The null hypothesis was rejected because the observed t value, t(28)=5.7,p<.01 , was within the critical region.

The null hypothesis was retained due to the observed t value, t(28)=2.69 , not being within the critical region.

The verbatim notetaking group scored significantly lower (M=20.9, SD =7.1) than the generative notetaking group (M=43.4, SD = 5.8) on the multiple-choice exam, t(28)=5.7, p<.01. This result suggests taking generative notes improves learning.

Based upon a critical value of 2.977 and an observed test statistic of t=7.5, we determined that the samples were extremely unlikely to come from the same population. As such we rejected the null hypothesis and accepted the alternative.

There was a significant difference between the generative notetaking group generative notetaking group (M=43.4, SD = 5.8) and the verbatim notetaking group (M=20.9, SD =7.1), t(14)=1.52 , p>0.5.

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