MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Researchers often create multiple 95% confidence intervals based on a given data set. For example, if the variable of interest is home price and there are five neighborhoods in the population, they might create 10 confidence intervals, one for each difference between
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- Why is it that the correct answer is D? How can we know that the data appear to be skewed in the given problem? What are the hint words in the situation that we can say it is skewed?arrow_forwardIf we calculate a 95% confidence interval (CI) instead of a 99% confidence interval, then: A. The midpoint and the width of the CI would increase. B. The midpoint of the CI would decrease, but the width would be unchanged. C. The midpoint and the width of the CI would decrease. D. The midpoint of the CI would be unchanged, but the width would decrease.arrow_forwardIf the difference in means of two data sets is not zero, does that imply that on average the two variables are significantly different?arrow_forward
- If only the median or mean incomes of the employees in a company are only reported, two companies could have the same median or mean income but very different levels of variability. Company A has several employees that make about the same amount- $1 to $3 above minimum wage. Company B has many employees who make minimum wage and several managers who are very highly paid. Checking some measure of variability, which company shows low variability in their salaries?arrow_forwardIf a 90%, a 95% and a 99% confidence interval are foung for a population mean, describe how the 3 interval estimates are related to each other. Which of the 3 intervals is most likely to contain the population mean?arrow_forwardWhat is the effect on a confidence interval if one decreases both sample size and the level of confidence?arrow_forward
- In a random sample of 250 high school students, it was found that 85.2% (213) of them later graduated. Find the 95% and 98% confidence interval for the true proportion of all high school students who graduate. Compare the two proportions.arrow_forwardFind a 90% confidence interval for the true proportion of people that eat frog legs, if in a sample of 732 people 65% eat frog legs.arrow_forwardWhat is the best explanation or solution to the answer?arrow_forward
- How do I solve the following problem?arrow_forwardResearchers ran a multiple linear regression to determine if belief accuracy in a political claim when given misinformation was related to the following independent variables: One’s level of anger (coded low = 0, high = 1) One’s level of anxiety (coded low = 0, high = 1) Whether the source of misinformation about the claim came from their own political party (in-party, coded from the other party = 0, from their party = 1) Whether or not a correction of misinformation was made (coded correction without evidence = 0, correction with evidence = 1) One’s political knowledge (continuous measurement from 0-4) One of the two issues in question (coded illegal immigration = 0, death penalty = 1) 4. The Adjusted R2 for Model 3 is 0.193. How would one interpret this? 5. In putting together a final model, would you want to remove any variables from Model 3? Why or why not? 6. They did not report standardized regression coefficients (β’s). What would the standardized regression…arrow_forwardWhat will be observed if calculated the three confidence intervals at 90%, 95%, and 99%? How would it be described as confidence intervals?arrow_forward
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