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Problem 1. Calculate the sample size needed given these factors: one-tailed t-test with two independent groups of equal sizesmall effect size (see Piasta, S.B., & Justice, L.M., 2010)alpha =.05beta = .2Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample half the size. Indicate the resulting alpha and beta. Present an argument that your study is worth doing with the smaller sample.Problem 2. Calculate the sample size needed given these factors:ANOVA (fixed effects, omnibus, one-way)small effect sizealpha =.05beta = .23 groupsAssume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size. Give your rationale for your selected beta/alpha ratio. Indicate the resulting alpha and beta. Give an argument that your study is worth doing with the smaller sample.Problem 3.In a few sentences, describe two designs that can address your research question. The designs must involve two different statistical analyses. For each design, specify and justify each of the four factors and calculate the estimated sample size you'll need. Give reasons for any parameters you need to specify for G*Power.
a test consists of 10 true or false questions. to pass the test a student must answer at least 8 questions correctly.
A research firm wants to compare the miles per gallon of unleaded regular, mid-grade, and super grades of gasoline. They drive the same car under approximately similar driving conditions and changing out the type of gasoline used.
Consequently, the consultants decide to test the null hypothesis ? ? 0 H : 33.7 . What is the value of the test statistic for testing this null hypothesis?
1. the residents of a housing development for senior citizens have completed a survey in which they indicated how
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1. consider the trials involved with flipping a fair coin. its reasonable to assume that coin flips are independent.
a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you draw?
JBGHI demands a sample large enough to ensure an error of ± 2% with 90% confidence. What is the necessary sample size?
q1. if a population distribution is known to be normal then it follows thata. the sample mean must equal the population
the following summary table presents the results from a repeated-measures anova comparing three treatment conditions
ANOVA is a powerful statistical test. How does ANOVA differ from other parametric tests? What are the conditions that must be met to use a one-way ANOVA?
a goodness-of-fit test is a nonparametric test involving a set of observed frequencies and a corresponding set of
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