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Given the situation described. identify the type of sampling involved. At a newspaper office, staffers are classified by the department by the department in which they work. The random samples from each department are taken.
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
whereas Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow a normal distribution. Convert Maria's midterm score of 84 to a standard z score.
Let X1 and X2 denote the proportion of two different chemicals found in a sample mixture of chemicals and used as an insecticide. Suppose X1 and X2 have the joint probability density function given by:
How to convert a exam score (standard score) back to Percent score? e.g. Total of students 16,
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:
standard deviation of the heights of young men is about 2.8 inches. suppose (unknown to you) the mean height of all male students is 70 inches. you measure 25 students. what is the sampling distribution of their average height x bar?
Suppose that X1,..,Xn form a random sample from the normal distribution with unknown mean M and unknown standard deviation S, and let m and s denote the MLEs of M and S. for the sample size n=17, find a value of k such that P(m > M +ks) = 0.95
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, ratio level data.
Develop the appropriate null and alternative hypotheses and what is the Type I error in this situation? What are the consequences of making this error?
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
Test claim that mean responses are same for all populations of patients receiving either treatment and of either gender.
At the .01 significance level can we (she) conclude that the true average daily amount of tips is greater than $80? yes or no.....
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