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Suppose that college science textbooks on average cost 225 dollars with a standard deviation of 45 dollars. Suppose that a random sample of 40 college science textbooks was taken. Find the probability that the sample mean is more than 235 dollars.
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
there are two major types of regression analysis-simple and multiple regression analysis. both types consist of
STA 141A Fall 2016 Homework. Compute the decision boundary for linear discriminant analysis, using Sepal.Length as the predictor variable. Compute the confusion matrix for the test data set
a. The U.S. population in 1949 was about 150,000,000. What proportion of all Americans were institutionalized at that time?
Is there any evidence to suggest that the true proportion of Canadians who rate their tech savviness as B or better is greater in Edmonton than in Thunder Bay? Use a = 0.01.
exponential random variable with ? = i/10. If the Xi's are independent, find the probability that the values of all four random variables are less than 1
Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
An educational psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability.
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean µ.
a student has computed that it takes an average mean of 16 minutes with a standard deviation of 3 minutes to drive from
The records show that 8% of the items produced by a machine do not meet the specifications. Use the normal approximation to the binomial distribution to answer the following questions.
Emoticons (facial feedback) withe-learning. Tung and Deng (2007) studied how emoticons (computerized facial expressions) and sex influenced intrinsic.
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