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A statistics class consists of 24 students, all but one of whom are unemployed or are employed in low paying part time jobs. One student works as an executive secretary earning $75,000 per year. Which does a better job of describing the income of typical student in the class: the mean or the median? Why?
the number of customers arriving per hour at a certain automobile service facility is assumed to follow a poisson
The maturity scores tend to be skewed (not normally distributed). Higher scores indicate higher Christian maturity. What statistical test should be used to analyze these data?
Ffinding that the mean sodium content is 324 mg, with a standard deviation of 35 mg. Find a 95 % confidence interval for the mean sodium content of this brand of hotdog.
Construction of frequency distribution table for the given continuous data.
Check that the formula (1) holds when X Unif(0, b). Formula (1) also works for b = 1. Check this when X is an Exponential RV with PDF f(x) = e-x for x 0.
A newspaper reports have 58 percent of farmers are planning to plant genetically modified crops presesnt year. The article adds that the poll is based on a random sample.
The distribution of the height of students in a large class is roughly bell-shaped. The average height is 68 inches, and approximately 95% of the heights are between 62 and 74 inches. Thus, the standard deviation of the height distribution is appr..
hamil sopa took a random sample of 60 invoices from his years records. the mean value of invoices in this sample was
Concept of statistical signi cance
Find the probability of a type II error, β, given that the true value of the population proportion is 0.72. The sample size is 50 and the significance level is 0.05.
Estimate the number of customers in the sample who order their food to go by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable).
Thirty-five fourth-grade students were asked the traditional question "what do you want to be when you grow up? The responses are summarized in the following table:
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