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Cromley and Azevedo (2007) were interested in the reading-comprehension performance of ninth graders. Students' reading comprehension was assessed with a test in which population mean performance is 33, with a standard deviation of 10. (a) One of the researchers' goals was to identify the bottom 30 percent of students so that they could determine the characteristics of students who struggled with reading. What cutoff score would Cromley and Azevedo use to identify the bottom 30 percent of readers? (b) Let's say we want to identify the best 10 percent of readers to put into an advanced class. What cutoff score on the reading-comprehension test would we use?
question a study is conducted to determine if time of day has any effect on test grades. an introductory psychology
We like to determine the current percentage of households using e-mail. How many households must be surveyed to be 90% confident that the sample percentage.
Use the p value method to determine whether or not to accept or reject the null and alternate hypotheses.
How many different committees on community development are possible?- Suppose the committee members are selected at random. What is the probability of a committee consisting of all Republicans?
question timescnn voter polls monitor public opinion for the presidential candidates during 2000 presidential
consider the sampling designs provided below. for each sampling design indicate whether or not the sampling is flawed.
Unisys maintains a hurricane database which provides information on hurricanes in the Atlantic/ Caribbean/Gulf of Mexico and the Eastern Pacific Ocean.
Find the probability that a randomly selected student is a nursing major. Find the probability that a randomly selected student is a nursing major given that the student is a male.
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
steam enters the condenser of a steam power plant at 20 kpa and a quality of 95 percent with a mass flow rate of 20000
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
Explain the difference between the completely randomized design and the randomized block design. Discuss in the context of a gasoline refining process. Under what conditions would you prefer to use each design?
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