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The random variable X has a population standard deviation of 19 and the random variable Y has a population standard devation of 11. The random variables X and Y are independent. What is the standard deviation of the random variable X + Y?
Express your answer to 2 decimal places of accuracy.
A private medical clinic wants to estimate the true mean annual income of its patients. If the confidence level is 95%, find the required sample size in order to meet the needs.
What portion of the variability in profit margin is explained by variability in the independent variables? Is the estimated regression equation a good fit for explaining profit margin?
Find the mean, median, and mode(s) of the observations in problem 2.- Find the lower, middle, and upper quartiles of this data set. Also find the 10th, 15th, and 65th percentiles. What is the interquartile range?
If this past distribution is a good indicator of future grades, what is the probability of a student receiving a C in the course?
The article "Multimodal Versus Unimodal Instruction in a Complex Learning Environment" (J. of Experimental Educ., 2002: 215-239) described an experiment carried out to compare students' mastery of certain software learned in two different ways.
Find the expected number of pairs of people with the same birthday, and the expected number of days in the year on which at least two of these people were born.
Suppose that qx is equal to a constant q for all x. Find expressions in terms of q and n for (a) npx, (b) ex. Do you think that this gives a realistic life table? Why or why not?
Visit the Web site cdc.gov/growthcharts/ and describe the different ways that weight and height distributions are conditioned on other variables.
Bartletts method is used to estimate the power spectrum of a process from a sequence of N = 2000 samples.
The coefficient of correlation between variables y and x is -0.90. Calculate and interpret the value of the coefficient of determination.
The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
assume that the following data are from a random sample of the body temperatures of 55 healthy adults.use excel or your
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