Exercise 19. Why are narrow confidence intervals better than wide ones? Discuss how n, o²,and a affect the width of a confidence interval.

Confidence intervals are used to estimate the range of values in which the true population parameter…

Answered: Exercise 19. Why are narrow confidence…

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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What is the effect on the size of the confidence interval if a T score is used instead of a Z score? OIt has no effect on the interval. OIt causes the interval to be bigger. OIt causes the interval to be smaller.
Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)
Chapter 9, Section 3, Exercise 061 Two intervals are given, A and B, for the same value of the explanatory variable. A: 16.5 to 25.1; B: 16.3 to 25.3; (a) Which interval is the confidence interval for the mean response?A or B Which interval is the prediction interval for the response? A or B (b) What is the predicted value of the response variable for this value of the explanatory variable?Enter the exact answer.The predicted value is=
4
2. In a simple random sample of 1200 Americans age 20 and over, 138 of them were found to have Type I diabetes. Round all answers to three decimal places. a) Report a 95% confidence interval for the proportion of all Americans age 20 and over with diabetes. J b) According to the Centers for Disease Control and Prevention, nationally, 10.7% of all Americans age 20 and over have diabetes. Does the confidence interval you found support or refute this claim? Explain.
What is the effect on the size of the confidence interval if a T score is used instead of a Z score? O It causes the interval to be smaller. O It has no effect on the interval. O It causes the interval to be bigger.
3
A team of researchers aims to understand whether a sleep treatment drug has an effect on the number of hours of REM sleep. Five subjects were randomly selected and their time in REM sleep (in minutes) was measured before treatment and after treatment. The before treatment measurements are: (30, 45, 90, 60, 100). The after-treatment measurements for the same five patients are: (35, 30, 80, 70, 110). Your boss looks at the confidence interval you computed and says that it is too wide to be useful for decision making. You propose a list of changes to your methodology that may result in a narrower interval. Which option should NOT be on your list: Group of answer choices increase the confidence level recruit more subjects into the study decrease the confidence level
Please help with A and B
What is the lower bound of the confidence interval? A 98% confidence interval for the data: 25, 38, 62, 45, 61, 38, 21, 42, 31, 35. Round to 2 decimal places.
Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online. Construct a 95% confidence interval estimate of the percentage of all adults who say that they prefer to get their news online. Can we safely say that fewer than 50% of adults prefer to get their news online?
What does a confidence interval for m indicate? When do we compute a confidence interval?

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Exercise 19. Why are narrow confidence intervals better than wide ones? Discuss how n, o², and a affect the width of a confidence interval.