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In a class, 20% of the students are male and 80% female. Among male students, 40% wears eye glasses; among female students, 30% wear eye glasses. If we select a student from the class at random, what is the probability that the student wears eye glasses?
Test the claim that the mean age of people in the United States who would say yes to the survey question shown in the table is 60 years or older.
Create raw score predictions on criterion variable for persons with Z scores on predictor value of -2,-1,0,+1,+2.
1. correlation concerns the relationship between the values of variables. regression analysis determines the nature of
Regression and Correlation are two of the most often used and abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause (causation) the other.
If the researcher computes the t-statistic to be 4.2 and t-value found in t table for df=60 and level of significance of 0.5, is 2.0 researcher would accept or reject null hypothesis.
In 2004, Newsmonth reported that 60% of young children have blood lead levels that could impair their neurological development. Assuming that a class in a school is a random sample from the population of all children at risk
a population has a mean of 81 and standard deviation of 25. find the mean and standard deviation of sampling
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
There is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal. What is the degrees of freedom?
this problem should be solved in excel please use separate spreadsheets for different parts.- consider a project
Determine margin of error was used in creating confidence interval above? Determine the sample size required to obtain the margin of error of 10.97 with 90% confidence interval?
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
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