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A developmental psychologist is studying memory development in children. He is interested in determining the exact age at which children began to recall long-term episodic memories. He compares the frequency and accuracy of long-term memories between groups of children aged 2.5, 3, 3.5, 4, 4.5 and 5 years old
Identify the following
Independent variable:
Levels of independent variable:
Dependent variable:
Compute the effect size with gender as the grouping variable and ADDSC as the dependent variable.
Markland Manufacturing intends to increase capacity by overcoming a bottleneck operation by adding new equipment. Two vendors have presented proposals.
Find the test statistic value for testing the equality of proportion variances.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Given the standardized normal distribution (with a mean of 0 and a standard deviation of 1, as in Table E.2), what is the probability that:
Develop a 95% confidence interval of the difference between the daily population means for the two airports.
A sample of 50 male and 50 female infants were put on an experimental infant formula. After two weeks the parents of each infant were asked to fill out a questionnaire concerning infant satisfaction on the formula. One of the questions was "Did Ba..
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
If the true mean for Saturday sales is now $4500, what is the probability of accepting the (false) null hypothesis in (a) above (the probability of not sharing the manager's concern because of lack of evidence)?
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
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