21. Researchers working for a certain airline are investigating the weight of carry-on bags. The researchers will usethe mean weight of a random sample of 800 carry-on bags to estimate the mean weight of all carry-on bags forthe airline. Which of the following best describes the effect on the bias and the variance of the estimator if theresearchers increase the sample size to 1,300 ?(A) The bias will decrease and the variance will remain the same.(B) The bias will increase and the variance will remain the same.(C) The bias will remain the same and the variance will decrease.(D) The bias will remain the same and the variance will increase.(E) The bias will decrease and the variance will decrease.

Bias is nothing but the error. It explains the difference between the actual and observed or…

Answered: 21. Researchers working for a certain…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Professor Hayashi wants to see if a new Canvas Homework system has an effect on how well students perform on Exam 2. The Exam 2 mean for all students who have ever taken his statistic course is 77.2. He collects data from a sample of 9 students who use the new Canvas Homework system. He finds the Exam 2 mean for this sample is 81.7 with a variance of 32.49. What is the effect size using Cohen's D.
Researchers at UT Austin noticed that the seagrass beds in Corpus Cristi Bay (CCB) were taller and thicker than those in Lower Laguna Madre (LLM). They compared the sediment ammonium concentration, in the two locations. Following are the summary statistics on sediment ammonium concentration, in micromoles, obtained by the researchers. Equality of variances is not assumed. CCB: X₁ 115.1, s₁= 79.4, n₁ = 51 LLM: X₂ = 24.3, S₂ 10.5, n₂: 19 = a. At the 1% significance level, is there sufficient evidence to conclude that the mean sediment ammonium concentration in CCB exceeds that in LLM? b. Determine a 98% confidence interval for the difference μ1-µ2, between the mean sediment ammonium concentrations in CCB and LLM. Interpret your answer in (a) in words. c. Do the results in (a) and (b) provide the consistent results? Explain.
Suppose that the City of Chicago is interested in potential revenues if they introduce a tolling station near O'Hare. Further suppose that the average time between cars is only 2.4 seconds; what is the variance of the distribution?
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The US Department of Health and Human Services compiles statistics on the consumption of alcohol. An investigator decides to look at the role of age in determining alcohol use. She requests data on the amount of drinking done by three different age groups: 16- to 20-year-olds, 21- to 25-year-olds, and ≥ 26-year-olds. The results come in, and a statistician conducts an analysis of variance. The is that there is no difference between the population means (in other words, there is no treatment effect). The is that at least one of the population means is different from another (in other words, there is an effect of at least one of the treatments). Note: The term “treatment effect” is used even when there is not actually a treatment. The age group is . The treatments (16- to 20-year-olds, 21- to 25-year-olds, and ≥ 26-year-olds) are . Which of the following might contribute to within-treatments variance? Check all that apply. Systematic…
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Hi, I'm stuck with question 2. Question 1 given the example for this question

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