MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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In the construction of an 88% Confidence Interval for a population
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- Find the value of tal2 and n = 25 for the %3D 90% confidence interval for the mean if the population standard deviation, ơ, is not known.arrow_forwardExercise 1.4 (5pts). A farmer recorded the weights of 25 randomly selected pigs from his farm. A 95% confidence interval for the mean weight was calculated to be from 280.2 to 289.8 pounds. What is being estimated by this confidence interval? Choose one: a. the weights of all pigs at this farm. b. the mean weight of 25 pigs at this farm. c. the mean weight of all pigs at this farm. d. the middle 95% of weights for pigs at this farm.arrow_forwardA simple random sample of 1000 people age 18 or over is taken in a large town. It turns out that 189 people in the sample are newspaper readers. Calculate a 95%-confidence interval for the percentage of people (age 18 and over) in that town who read newspapers.arrow_forward
- A researcher is attempting to calculate a 95% confidence interval for the mean average wingspan of Statsian Swallows in a particular rainforest. They take a sample and find that of the 16 swallows surveyed, the mean average was 3.14 inches and the standard deviation was 0.2 inches. What is the 95% confidence interval for this sample?arrow_forwardUse Table V in Appendix A to determine the t-percentile that is required to construct each of the following two-sided confidence intervals: (Express your answers to 3 decimal places.) Confidence level = 95 %, degrees of freedom = 11 , Confidence level = 95% , degrees of freedom = 14 Confidence level = 99 %, degrees of freedom = 12 Confidence level = 99% , degrees of freedom = 10arrow_forwardA Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages. Construct a 95% confidence interval for the proportion of adults who have a Facebook page.arrow_forward
- Given a confidence interval (0.08, 0.22), what is the margin of error?arrow_forwardFor the data in the Excel file Education and Income, find 95% confidence intervals for the mean annual income of males and the mean annual income of females. Can you conclude that the mean income of one group is larger than the other? Education and Income Gender Age Level of Education Gross Annual Income Female 40-60 Graduate Degree $75,000 Female 25-39 Bachelor's Degree $47,000 Male 40-60 High School/GED $40,000 Female 25-39 Some College $30,000 Female 25-39 Some College $60,000 Female 40-60 Bachelor's Degree $80,000 Female 25-39 Bachelor's Degree $10,000 Female 25-39 Bachelor's Degree $43,000 Male 25-39 Bachelor's Degree $130,000 Female 40-60 Bachelor's Degree $89,000 Female 40-60 Graduate Degree $50,000 Female 18-24 Some College $13,462 Female 25-39 Bachelor's Degree $85,000 Male 25-39 Bachelor's Degree $60,000 Male 40-60 Graduate Degree $200,000 Female 25-39 Associates Degree $44,000 Male 25-39 High School/GED $26,000 Male…arrow_forwardGiven a confidence interval {21.98, 28.64 and a mean of 25.31, the margin of error is 6.66. True or Falsearrow_forward
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