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The mean weekly income of residents of one state is $570. A random sample of 12 residents of one small town in the state yielded the following weekly income in dollars 480 780 392 431 515 717 1120 495 560 520 503 900 At the 0.05 level of significance, does the data provide sufficient evidence to conclude that the mean weekly income for residents of this town is lower than the state mean income of $570? Assume that the population has a normal distribution
Why is normality required for standard deviation applicability?
A statistics professor plans class so carefully that the lengths of his classes are uniformly distributed between 45.0 and 55.0 minutes. find the probability that a given class period runs greater than 50.75 minutes? find the probability of se..
1. listed below are the numbers of people executed in the united states from 1976 nbsp to 1994. in 1976 the u.s.
In 1997 the British government created a program
Suppose x is a random variable with n=3 and p=.3, calculate the value of p(x), x=0,1,2,3, using the formula for a binomial probability distribution?
What is the probability
Let X1....X10 be a random sample from a population with mean 50 and standard deviation 4. Let X be the sample mean. Find the expected value and standard deviation of X. Do you know the probability distribution of X ? Clearly state any neces..
what is the point estimate for the mean hospital cost for victims who wore seat belts and construct and interpret 99percent conf interval estimate for the mean hospital costs for accident victims who wore seatbelts.
Find a peer-reviewed journal article that employs the Pearson's correlation coefficient
Find the probability that if four subcomponents are randomly selected, all four have lengths that exceed 120 cm. normally distributed with mean =117cm and standard deviation of 5.2 cm
Which result had the margin of error of ±9 percentage points?
Calculating a Z-score and graphing a box plot and Statistical Inference of Sample Mean , Binomial Distribution and Regression Analysis
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