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A social psychologist wants to know how long people will wait before responding to cries for help from an unknown person and whether the gender or age of the person in need of help makes any difference. One at a time, subjects sit in a room waiting to be called for an experiment. After a few minutes they hear cries for help from the next room, which are actually on a tape recording. The cries are in either an adult male's, an adult female's, or a child's voice; seven subjects are randomly assigned to each condition. The dependent variable is the number of seconds from the time the cries begin until the subject gets up to investigate or help.
Child's Voice
Adult Female Voice
Adult Male Voice
10
17
20
12
13
25
15
16
14
11
5
7
8
18
2
3
a. Do these data indicate any significant differences among the three groups? Test with a = .05. Show all 4 steps.
b. Present the results of the ANOVA in a summary table.
c. Compute h2 , the percentage of variance accounted for by the treatment.
d. Compute Tukey's HSD to determine where the significant difference is. (You will also need to know Scheffe, so I would practice it too but it's not required for homework).
e. Write a sentence demonstrating how a research report would present the results of the hypothesis test and the measure of effect size
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question consider the ages of ceos of companies throughout the united states.event a ceo is under 40event b ceo is at
An assumption for a significance test of the correlation coefficient is that the populations, the variance of each variable is the same at each point of the other variable.
Is there sufficient evidence to conclude that the true standard deviation σ of the fill measurements of 16-ounce cans is less than 0.1 ounce? Calculate the 95% confidence interval for the population mean.
Human populations can be modeled using an exponential growth function. Use the Library for research or other resources to find the following:
1.at what age do babies learn to crawl? does it take longer to learn in the winter when babies are often bundled in
Formulate the null and alternative hypotheses for a hypothesis test. Identify the population and describe how to select a random sample for a hypothesis test. State in clear terms the conclusion that should be given if the null hypothesis is rejec..
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
A process is out of control when:
The local municipality claims that since the percentage of intersections that had an accident last year decreased from the prior year, the city is now safer. What are the hypotheses for this situation? Is the city really safer?
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