A lab course instructor would like to know the average time that student teams spend in the labclassrooms conducting experiments and collecting data. The instructor gets information from 45 teamsand calculates a 90% confidence level estimate of the average time to within +0.8 hours (that is,calculates the interval [average time - 0.8 h, average time + 0.8 h]). How many teams should provideinformation to the instructor to obtain a 90% confidence level estimate to within +0.4 hours?

The question is about sample size estimation.Introduction :The formula of sample size is given…

Answered: A lab course instructor would like to…

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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An environmentalist wants to find out the fraction of oil tankers that have spills each month. Suppose a sample of 455 tankers is drawn period of these ships, 310 do not have spills. Using the data, construct the 85% confidence interval for the population proportion of oil tankers that have spills each month. Round your answers to 3 decimal places Lower endpoint = Upper endpoint =
A random sample of n1 278 people who live in a city were selected and 98 identified as a "dog person." A random sample of n2 = 109 people who live in a rural area were selected and 65 identified as a "dog person." Find the 90% confidence interval for the difference in the proportion of people that live in a city who identify as a "dog person" and the proportion of people that live in a rural area who identify as a "dog person." Round answers to to 4 decimal places. < pi – p2 < Submit Question
A recent survey showed that 42% of US employers were likely to require higher employee contributions for health care coverage. Suppose the survey was based on a sample of 500 companies. Find the 99% confidence interval for the proportion of all companies likely to require higher employee contributions for health care coverage. (Round to four decimal places)
Do Construct a confidence interval on a slope?
Alfredo wants a 85% confidence interval for the true average gas mileage for a Gremlin after randomly sampling 9 Gremlins. It is known that the true sigma for Gremlin gas mileage is 4 mpg, and the average of the 9 Gremlins in Alfredo's study was 24 mpg. Find the confidence interval assuming the distribution is normal.
The university surveyed 500 students and found that 150 of the students surveyed watch more than 5 hours of Netflix monthly. Develop a 90 percent confidence interval to estimate the true proportion of students who watch more than 5 hours of television each week. What is the confidence interval?
You recently sent out a survey to determine if the percentage of adults who use social media has changed from 62%, which was the percentage of adults who used social media five years ago. Of the 2283 people who responded to survey, 1635 stated that they currently use social media.a) Use the data from this survey to construct a 94% confidence interval estimate of the proportion of adults who use social media. Record the result below in the form of (#,#)(#,#). Round your final answer to four decimal places.
A confidence interval has been determined to be -6<u<6, what was the sample mean that was used to produce this confidence interval?
In a random sample of 670 Americans, 35% indicated that they have a cat for a pet. Estimate with 96% confidence the proportion of all Americans that have cats as pets. Give the confidence interval in interval notation, (LCL,UCL) Give your answer as percentages, to at least 2 decimal places, and use at least 3 decimal places in your critical value. Confidence Interval:
A researcher investigated whether the temperature of milk, x, can be used to predict the milk's pH content, y. She predicted the pH level of a glass of milk with a temperature of 8.45 degrees to be ŷ= 6.795 a)A 95% confidence interval for the mean pH of all milk with temperature 8.45 degrees is calculated to be (6.76, 6.83). Which of the following is the correct interpretation of this confidence interval? -The mean pH level for all glasses of milk having a temperature of 8.45 degrees is somewhere between 6.76 and 6.83, with 95% confidence. -The pH level for one glass of milk with a temperature of 8.45 degrees is somewhere between 6.76 and 6.83, with 95% confidence. -There is a probability of 0.95 that the mean pH level for this glass of milk with temperature 8.45 degrees is between 6.76 and 6.83. -95% of all glasses of milk with a temperature of 8.45 degrees have a pH level between 6.76 and 6.83. b)Suppose we have a glass of milk whose temperature is 8.45 degrees. We…
We randomly sample 600 people in a specific town. 342 of them like cats. Based on this, construct a 95% confidence interval for the true population proportion of people in this town who like cats. Give your answers as decimals, rounded to four places.

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