When interpreting a box-and-whisker plot, taller boxes mean: Question 1 options:

Question

When interpreting a box-and-whisker plot, taller boxes mean:

Question 1 options:

a)

b)

c)

d)

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Question 2 (10 points)

Given M1 = 50, M2 = 48, and s2pooled = 5.00, how large is the effect size?

Question 2 options:

a)

b)

c)

d)

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Question 3 (10 points)

Sandy collects data on how long males and females stay at the gym when they exercise. If males' average is 50 minutes and females' average is 75 minutes, what is the value of t if sM1–M2 = 13.25?

Question 3 options:

a)

b)

c)

d)

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Question 4 (10 points)

Emilia randomly selects participants from her general psychology course. If she asks each participant to bring a friend who has not taken general psychology, to participate in the study as a comparison group, this would be an example of:

Question 4 options:

a)

b)

c)

d)

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Question 5 (10 points)

If researchers decide to conduct an independent-samples t test to analyze their data, their null hypothesis would indicate that:

Question 5 options:

a)

b)

c)

d)

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Question 6 (10 points)

Dr. Kim, a sensory psychologist studying humidity's effect on perceived temperature, used six volunteers for her study who were individually tested once in each condition. Which of the assumptions for dependent-samples t tests did she avoid violating?

Question 6 options:

a)

b)

c)

d)

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Question 7 (10 points)

In a _____ design, the participants are measured on a dependent variable before and after an intervention.

Question 7 options:

a)

b)

c)

d)

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Question 8 (10 points)

Use the description of an experiment done in a children's hospital.

A music therapist was interested in investigating whether listening to music or composing music had an influence on both anxiety levels and oxygen saturation in children who were hospitalized for asthma-related illnesses. Thirty-two children spent 20 minutes listening to classical waltzes played on a piano. On a different day, they spent 20 minutes composing their own short pieces of music using a software program.

When listening to music: For the physiological measure, the critical value for t was larger than the test statistic for the observed data. For the anxiety measure, the critical value for t was smaller than the test statistic for the observed data.

When composing music: For the physiological measure, the critical value for t was larger than the test statistic for the observed data. For the anxiety measure, the critical value for t was larger than the test statistic for the observed data.

Reference: Ref 9-2

When writing the results of the music therapist's study, which of these statements reflects the correct conclusions that should be drawn from the results and then included as part of the interpretation paragraph?Question 8 options:

a)

b)

c)

d)

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Question 9 (10 points)

When a result is not statistically significant, it cannot be:

Question 9 options:

a)

b)

c)

d)

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Question 10 (10 points)

Use the description of an experiment done in a children's hospital.

A music therapist was interested in investigating whether listening to music or composing music had an influence on both anxiety levels and oxygen saturation in children who were hospitalized for asthma-related illnesses. Thirty-two children spent 20 minutes listening to classical waltzes played on a piano. On a different day, they spent 20 minutes composing their own short pieces of music using a software program.

When listening to music: For the physiological measure, the critical value for t was larger than the test statistic for the observed data. For the anxiety measure, the critical value for t was smaller than the test statistic for the observed data.

When composing music: For the physiological measure, the critical value for t was larger than the test statistic for the observed data. For the anxiety measure, the critical value for t was larger than the test statistic for the observed data.

Reference: Ref 9-2

When writing the results of the music therapist's study, which of these statements reflects the first point of the interpretation paragraph?Question 10 options:

a)

b)

c)

d)

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a)

higher averages and more variability within a group.

b)

higher averages within a group.

c)

a positively skewed distribution.

d)

more variability within a group.

Explanation / Answer

Ans 1: Option is (a). Explanation: In most of the cases the box-and- whisker is drwan vertically. Although it can be drwan in any form. The length of the box becomes its height. The box length gives an indication of the sample variability. Hence taller boxes which in turn means higher length means higher variability.

Ans 2: Option is (a). Explanation: effect size = (M2 - M1)SD pooled.

Over here the effect is .4 which according to Cohen represent "small" effect size

Small effect size is the one where there is a real effect but you will only be able to see that through careful study.

Ans 4: Option is (c). Explanations: In this case friends of the particapants are invited. This means the second group of studnets are paired with the first group of randomly selected students from the psycology class. The two samples are dependant/paired as the members of one sample can be used to determine the memebers of the other sample.

Ans 8: The option is (c). This is because when the critical value is smaller than the value of test statistic you reject the null hypothesis. In this case Null Hypothesis increase oxygen level by listening to music.

Ans 9: The option is (a). A result which is statistically significant is a result that is not attributed to chance and hence more reliable.

Ans 10: The option is (b). This is because when the crtical value is larger than the value of the test statistic you fail to reject the null hypothesis. In this case it increase oxygen level either by composing or litening to music.

Ans 7: The option is (a).

Ans 6: The option is (b). Obsservations are independant if the occurence of one gives no information about occurerence of the other. In this case six volunteers were tested individually and the any outcome could not have given any information about the other outcome.

Ans 5: The option is (a).

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