How to find critical values of Z that corresponds to an 82% confidence level 1. Find the critical values Zc that corresponds to an 82% confidence level.

Answered: Find the critical values Zc that…

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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Find the critical valuez Subscript alpha divided by zα/2that corresponds to the confidence level85%.
help pleasee thank you! A national organization sets out to investigate the change in prevalence of HIV since the last census in 2010. A total of 100 participants were interviewed and HIV prevalence in the sample is 7.5%. Assume that the data from the 2010 census indicated that the prevalence of HIV in the particular population was 5%. In order to test whether the prevalence of HIV now is significantly different from the HIV prevalence in 2010 at 95% confidence level, can we use a z-test to conduct a hypothesis test? Why? Why not? Group of answer choices Yes, we cannot use a z-test since ??0?0 = 100*0.075*(1-0.075)=6.93 > 5 Yes, we can use a z-test since ??0?0 = 100*0.05*(1-0.05)=4.75 < 5 Yes, we can use a z-test since ??0?0 = 100*0.075*(1-0.075)=6.93 > 5 No, we cannot use a z-test since ??0?0 = 100*0.05*(1-0.05)=4.75 < 5
An article included data from a survey of a random sample of adults living in the United States. Of the 1,300 people who participated in the survey, 700 responded they believe that global climate change is a major threat to the well-being of the United States. USE SALT Use the five-step process for estimation problems (EMC³) to construct a 95% confidence interval for the proportion of adults in the United States who believe that global climate change is a major threat to the well-being of the United States. (Hint: See Example 9.4. Enter your answer using interval notation. Round your numerical values to three decimal places.) 0.556, 0.610 X Interpret the interval. O There is a 95% chance that the mean number of all adults in the United States who believe that global climate change is a major threat to the well-being of the United States is directly in the middle of this confidence interval. O We are 95% confident that the mean number of all adults in the United States who believe that…
The 95% Confidence Interval for the weights (in pounds) of a special type of rock has found to be 4.19, 7.48. What will be the margin of error? (Hint: Sample mean +/- margin of error = confidence interval)
An investigator conducts a study to investigate whether there is a difference in mean peak expiratory flow (PEF) in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Construct a 95% confidence interval for the mean PEF in children without chronic bronchitis. b. How many children would be required to ensure that the margin of error in (a) does not exceed 10 units? What is the margin of error? Group # Children Mean PEF Std Dev PEF Chronic Bronchitis 25 281 68 No Chronic Bronchitis 25 319 74 a. 95% CI ( , )
In a study of speed dating, male subjects were asked to rate the attractiveness of their female dates, and a sample of the results is listed below (1-not attractive; 10 = extremely attractive). Construct a confidence interval using a 90% confidence level. What do the results tell about the mean attractiveness ratings of the population of all adult females? 6,9,3,10,4,5,6,8,8,8,5,9 What is the confidence interval for the population mean μ? (Round to one decimal place as needed ) < μ <
A 90% confidence interval for the mean of airline reservations being canceled on the day of the flight is between 2.68 and 9.42 reservations. What is the point estimate of the mean of reservations that are canceled on the day of the flight?
What prerequisites should students have the knowledge of before calculating the confidence intervals for two population means?
It is known that the overall job satisfaction (score range 0-10) of professors follows a normal distribution. The job satisfaction of 16 SUNY professor shows blow using a histogram. Calculate the 95% CI to estimate the professor population's average job satisfaction level and interpret the 95% CI. List two ways that you could use to get a narrower confidence level. Which way is better? Why?
Choose the correct option and proof the reason why you choose that one and give the evidences. A company called The Bear Necessities Business conducted a survey to gather customer feedback about a recent change they made. From the data collected, a 95% confidence interval was constructed to estimate the difference between the proportion of new customers who are positive about the change and the proportion of old customers who are positive about the change. The limits of this confidence interval are (-0.31, 0.49). Use this information to answer the following questions. The point estimate used for the confidence interval is a sample mean/sample porportion/different of two sample means/different of two sample proportion. The sample proportion for new customers was the same as/higher than/ lower than he sample proportion for old customers. Some but not all/All he sample proportion for old customers. Therefore, we can not/can claim that the proportion of customers who are…
Find the critical value corresponding to a sample size of 19 and a confidence level of 99%
We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 15 had kids. Based on this, construct a 99% confidence interval for the proportion, p, of adult residents who are parents in this county.

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