A researcher is interested in whether there are changes in child aggression after they watch another...

A researcher is interested in whether there are changes in child aggression after they watch another child get something that they want. She devises an experiment where children come into her lab and are given worn and broken toys to play with. After a short time, a new child is brought into the room and is given new, shiny toys to play with. The researcher wants to know whether there are changes in aggressive behavior among the children with the broken, worn toys after they see the new children playing with new, shiny toys. She measures the number of aggressive behaviors displayed by the children who were given the worn and broken toys both before and after they watch the new children playing with new, shiny toys. Her findings are summarized in the table below.

Child	Before	After
A	16	18
B	10	11
C	17	19
D	4	6
E	9	10
F	12	14

a. Identify the IV, IV levels, and DV.

IV:
Levels:

DV:

b. Is this experiment a paired-samples or independent-samples design?

c. State null and alternative hypotheses in words.

H₀:
H₁:

d. Conduct a statistical test of the hypothesis

t =

e. Decide whether to reject or retain the null hypothesis.

f. Interpret your results.

Solutions

Expert Solution

orchestra answered 2 years ago

Next > < Previous

Related Solutions

QUESTION 4 A researcher is interested in testing whether there is a difference in aggression levels...

QUESTION 4 A researcher is interested in testing whether there is a difference in aggression levels between kids who watch only TV shows, only play video game, or watch TV and play video games. Which statistical test should be used to determine whether a difference exists in aggression levels for these 3 groups? T-Test for One Sample T-Test for Independent Samples T-Test for Related Samples One-Way ANOVA Two-Variable Chi Square Test Question 5: A psychologist is interested in the relationship...

A researcher interested in the link between video games and aggression collected data on the number...

A researcher interested in the link between video games and aggression collected data on the number of hours spent playing violent games per week (Independent) and number of aggressive acts per week (Dependent) for a sample of 8 adolescents a) Use the 5-step model to determine whether there is a statistically significant correlation between hours spent playing video games per week and average number of aggressive acts per week. The test statistic: r = 0.741. Set alpha at .05. b)...

Related T-Test Sample 1. A researcher is interested in testing whether rats learned a maze after...

Related T-Test Sample 1. A researcher is interested in testing whether rats learned a maze after daily training sessions. The researcher recorded the number of errors committed by each rat before any training in the maze. Then, the researcher recorded the number of errors made by each rat after training. The scores below summarize the errors by each rat before and after training. Perform a dependent-sample (repeated-measures) t-test on the scores to test whether or not the number of errors...

1)A researcher is interested in assessing the impact of a number of changes in a factory...

1)A researcher is interested in assessing the impact of a number of changes in a factory on the job satisfaction of workers. Before the changes are implemented the researcher distributes a questionnaire to a sample of workers which measures their attitudes to their work and their overall job satisfaction. The same questionnaire is distributed to the same group of workers one month after the workplace changes were implemented, and again three months later. (a) Which parametric statistical technique could the...

A researcher is interested in whether or not there is a difference in student’s performance based...

A researcher is interested in whether or not there is a difference in student’s performance based on the study methods they use. Participants are assigned one of three different study methods (read the text and re-read it, read and answer prepared questions, and read then create your own questions). There are 6 people in each group and the researcher measures the participants’ performance on a test. Perform a hypothesis test and show all four steps. Hints: Use a two tailed...

Another researcher is interested in how caffeine will affect the speed with which people read but...

Another researcher is interested in how caffeine will affect the speed with which people read but decides to include a third condition, a placebo group (a group that gets a pill that looks like the caffeine group does, but it does not contain caffeine). The researcher randomly assigns 12 people into one of three groups: 50mg Caffeine (n1=4), No Caffeine (n2=4), and Placebo (n3=4). An hour after the treatment, the 12 participants in the study are asked to read from...

A family researcher is interested whether there is an association between the number of siblings a...

A family researcher is interested whether there is an association between the number of siblings a person has and the number of children they have. She interviews six older adults and finds the following information. Number of Siblings Number of Children 0 1 1 1 2 1 2 0 3 3 4 3 Mean Number of Siblings = 2 Mean Number of Children = 1.5 Standard Deviation = 2 Standard Deviation = 1.5 Explain which variable more naturally plays the...

A researcher is interested in determining whether there is a correlation between number of packs of...

A researcher is interested in determining whether there is a correlation between number of packs of cigarettes smoked # packs of cigarettes smoked (X) (Y) 0 80 0 70 1 72 1 70 2 68 2 65 3 69 3 60 4 58 4 55 day and longevity (in years). n=10.

A researcher is interested in determining whether the new design of the training simulator and a...

A researcher is interested in determining whether the new design of the training simulator and a new behavior modification program will affect a student’s learning behavior. Sixty-three (63) students are randomly selected for inclusion in this research project. The students are randomly divided into 9 groups of 7. The group assignments are as follows: Design A Design B Design C No behavior modification 12 18 21 10 16 22 19 27 33 19 23 35 15 26 27 18 22...

A researcher is interested in determining whether there is a relationship between the weekly number of...

A researcher is interested in determining whether there is a relationship between the weekly number of room air-conditioning units sold and the time of year. What type of descriptive chart would be most useful in performing this analysis? Explain your choice.

Subjects