Reference no: EM13245746
1) Bandura, Blanchard, and Ritter (1969) conducted an experiment that provided individuals with one of four treatments for their intense fear of snakes. One group worked with a model - a person who handled a 4-foot king snake and encouraged others to imitate her. One group watched a film of adults and children who enjoyed progressively closer contact with a king snake. A third group received desensitization therapy, and a fourth group served as a control, receiving no treatment. The numbers of snake-approach responses after treatment are listed in the table. A higher number of snake-approach responses indicates that the individual was willing to approach a snake more often.
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Type of Treatment
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Model
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Film
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Desensitization
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Control
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29
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22
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21
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13
|
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27
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18
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17
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12
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27
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17
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16
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9
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Perform a hypothesis test to determine if there is a significant difference between the groups in the number of snake-approach responses. Show all necessary components of a full hypothesis test, including a source table.
2) What is the effect size for this result? Is this a large effect?
3) An employer wants to know what types of activities encourage her employees to exercise. The first month, she gave out information on the health benefits of exercise; the second, she sent daily emails encouraging physical activity; and in the third month, she gave health insurance bonuses for amount of exercise. She recorded the number of times 4 of her employees exercised in each of the three months. Can she determine if there is a significant difference in the number of days exercised between the three types of activities? Again, show all necessary components of a hypothesis test, including a source table.
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Employee
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Month 1 (Info)
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Month 2 (Emails)
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Month 3 (Bonuses)
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1
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4
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7
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29
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2
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6
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7
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26
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3
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2
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11
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24
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4
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3
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9
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21
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4) Calculate a Tukey's HSD post-hoc test for the difference between Month 2 and Month 3. Is the difference significant? Was a post-hoc test necessary to determine this?
5) A market testing company wants to know if there is a difference in preference between two new types of chocolate bar. They also want to know if there is a gender difference.
a) How many cells would this ANOVA have?
b) What are the independent and dependent variables?
c) Here is the source table for this study. Write a conclusion for these results.
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Source
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SS
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df
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MS
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F
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Gender
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6.24
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1
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6.24
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6.50
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Chocolate bar
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20.24
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1
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20.24
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21.08
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Gender*Chocolate
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8.99
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1
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8.99
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9.36
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Within
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11.49
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12
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0.96
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|
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Total
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46.96
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15
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|
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d) What is the effect size for the interaction effect?
6) Find the mistakes this source table.
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Source
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SS
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df
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MS
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F
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Between
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1621
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2
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810.5
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81.318
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Subjects
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45.825
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5
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91.65
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0.919
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Within
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99.675
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10
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9.967
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Total
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1866.50
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17
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109.79
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7) What type of ANOVA is the source table in #6 for?
8) What is the main factor that differentiates whether you should calculate a t statistic or an F statistic?
9) How many types of ANOVA have we covered? What feature or features distinguish between them?
10) Look back to the graphic you created to help you choose which z or t test to use (or use one of the graphics from the answer key). Modify the graphic to include the different types of ANOVA from this unit.
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Who is more motivated to work than us counterparts
: A research study has suggested that changes in hours worked over time are due, in part, to changes in tax rates. "If taxes and [government expenditures] are high, that may lead to less work," said one of the researchers.
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State the molar mass of citric acid
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Define what mass of no2 can be produced
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Complete the last column indicating at each price level
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