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How do you calculate -/+ variations on a best fit line. For example a woman 172cm tall how large would her shoes be?
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if Za denotes the value of Z for which the standard normal curved area to its right is equal to a, find Z=0.01
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history of statistics
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Solve the problem. A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what would have been obtained by interviewing all voters in the United...
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1. If , , what is the probability that a particular weekly income selected at random is between $790 and $1,000? What is the probability that the income is less than $790?
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In one town, 54% of all voters are Democrats. If two voters are randomly selected for a survey, find the probability that they are both Democrats.
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what is true about the sample mean of the sampling distribution
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VISA reported with 95% confidence that 19% of those surveyed used checks to pay for purchases. If 1478 people participated in the survey, what was the percentage of error?
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The mean height of a certain kind of plant is 184 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 184. State the null hypothesis H 0 and the alternative hypothesis H 1 that we would use...
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crates of eggs are inspected for blood clots by randomly removing 3 eggs in succession and examining their contents. if all 3 eggs are good, the crate is shipped, otherwise it is rejected. what is the probability that a crate will be shipped if it contains 120 eggs, ofwhich 10 have blood clots?
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
- 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?
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