A manager at an investment bank is considering aninvestment in Meta stock. As part of her initialresearch, she calculates daily returns for the stockon the 20 trading days between 1/23/2023 and02/17/2023. Date2/17/20232/16/20232/15/20232/14/20232/13/20232/10/20232/9/20232/8/20232/7/20232/6/20232/3/20232/2/20232/1/20231/31/20231/30/20231/27/20231/26/20231/25/20231/24/20231/23/2023Daily Return (in %)0.3-2.7-1.303-2.1-3-4.33-0.3-1.223.32.81.3-3.134.1-1.1-0.12.81) What are the critical values you need toconstruct a 90% confidence interval for thestandard deviation of daily returns ?2) Calculate a 90% confidence interval for thestandard deviation of daily returns .(Roundnumbers to 1 decimal.)3) The manager will include a stock in her portfolioonly if the standard deviation of daily returns isbelow 6%. Conduct a hypothesis test to help themanager make her decision, using a significancelevel of 1% What do you conclude ? (In youranswer, show the steps involved with testing .)

The population variance is compared to the sample variance and it is tested using the test for…

Answered: 1) What are the critical values you…

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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Call me: A sociologist wants to construct a 95% confidence interval for the proportion of children aged 8-10 living in New York who own a smartphone. Part: 0 / 3 Part 1 of 3 (a) A survey by the National Consumers League estimated the nationwide proportion to be 0.38. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04? A sample of children aged 8-10 living in New York is needed to obtain a 95% confidence interval with a margin of error of 0.04 using the estimate 0.38 for p. Skip Part. Check E 888 R $100 FO MacBook Air X Save For Later C 00 [110] Submit Assignment 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibilit
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=
Abe and Betty want to estimate the mean of a population with known standard deviation o. Abe takes 50 samples whereas Betty takes 80 samples. Which of the following statements are correct? (A) If both Abe and Betty use confidence intervals of the same width, then the confidence level of Abe's interval is smaller than that of Betty's (B) If both Abe and Betty use confidence intervals of the same width, then the confidence level of Abe's interval is larger than of Betty's (C) If Abe and Betty construct confidence intervals with the same confidence level, then the width of Abe's interval is smaller than that of Betty's (D) If Abe and Betty construct confidence intervals with the same confidence level then the width of Abe's interval is larger than that of Betty's (B) and (C). (A) and (D) (B) and (D) (A) and (C)
Suppose that you are interested in the number of people in each household in the U.S. Your sample includes 10 households, with a mean 2.5 and a standard deviation 1.2. Construct a 95% confidence interval (CI) of the mean number of household members. (A) 1.2-3.8 (B) 1.4-3.6 (C)1.6-3.4 (D) 1.7-3.3 (E) 1.8-3.2
Please let me know if I calculated relative risk correctly. Thank you for your assistance.
a researcher wishes to develop an interval estimate for response scores on user surveys. She's not sure about the standard deviation, but in previous years the scores have ranged from 25 to 86. How large a sample should she draw if she wants to construct a 95% confidence interval level that will be within 3 points of the population mean score?
Ellie and Alec are each attempting to estimate the proportion of coffee drinkers who consume more than one cup of coffee per day. They each obtain a random sample of coffee drinkers, and, in each sample, the proportion who drink more than one cup of coffee per day is 0.40. Ellie and Alec each use their sample data to construct a confidence interval. Ellie’s interval is from 0.286 to 0.514, and Alec’s interval is from 0.346 to 0.474. One of these intervals was computed correctly, but the other was not. Which interval must be incorrect? A. Ellie’s interval must be incorrect. B. Alec’s interval must be incorrect. C. It’s impossible to answer this question without knowing the level of confidence used for each interval. D. It’s impossible to answer this question without knowing the sample sizes. E. It’s impossible to answer this question without knowing the sample sizes or the level of confidence used for each interval.
You would like to construct a 99% confidence interval to estimate today's population mean temperature, so you make a series of measurements (a random sample) throughout the day. The mean of these measurements is 58.5 degrees Fahrenheit, and their standard deviation is 3.0 degrees Fahrenheit. For each of the following sampling scenarios, determine which distribution should be used to calculate the critical value for the 99% confidence interval for the population mean.(In the table, Z refers to a standard normal distribution, and t refers to a t distribution.)
How do I solve the problem?

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