Drill lifetime: A sample of 50 drills had a mean lifetime of 12.88 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is6.31.Part: 0 / 3Part 1 of 3(a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimalplaces.The confidence interval isNOV20...MacBook AirDII80888F8F9F10F5F6F7F2F3F4&@%23246.7* CO

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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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A random sample of 9 fields of rye has a mean yield of 39.4 bushels per acre and standard deviation of 4.09 bushels per acre. Determine the 95% confidence interval for the true mean yield. Assume the population is approximately normal. Step 2 of 2: Construct the 95% confidence interval. Round your answer to one decimal place.
Question 2 Scientists believe that global warming has changed the mean temperature. To measure this effect is construct a 90% confidence interval for the sample mean. The sample standard deviation of the minimum temperature in the Salt Lake area is 2.47, and the sample mean is 42.35 on 36 degrees of freedom. The mean temperature of the daily minimum in SLC was 39.22 before 1980. If this mean value is not contained in the confidence interval we reject the null hypothesis. See: https://www.nytimes.com/2019/02/28/learning/teach-about-climate-change-with-these-24- new-york-times-graphs.html e Note this is real data obtained from the weather stations in SLC. (41.92,42.79 No answer text provided. (41.9,42.8) O (41.7,43) O (41.83,42.88)
• Question 7 If n=15, a(x-bar)%-D41, and s=2, find the margin of error at a 80% confidence level Give your answer to two decimal places. Question Help: D Post to forum Submit Question
Mrs. Gallas wanted to estimate the average weight of an Oreo cookie to determine if theaverage weight was less than advertised. She selected a random sample of 30 cookies andfound the weight of each cookie (in grams). The mean weight was = 11.1921 grams with astandard deviation of sx = 0.0817 grams. Make a 95% confidence interval to estimate the truemean weight of an Oreo. 1. What is the formula for calculating the standard deviation of the sampling distribution of x? 2.What condition must be met to use this formula? Has it been met?
A random sample of 9 fields of rye has a mean yield of 37.0 bushels per acre and standard deviation of 6.23 bushels per acre. Determine the 95% confidence interval for the true mean yield. Assume the population is approximately normal. Step 1 of 2 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
A random sample of 27 fields of rye has a mean yield of 43.1 bushels per acre and standard deviation of 5.31 bushels per acre. Determine the 80% confidence interval for the true mean yield. Assume the population is approximately normal. Step 1 of 2 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
Question 3 You measure 24 textbooks' weights, and find they have a mean weight of 35 ounces. Assume the population standard deviation is 9 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places Calculator > <μ<
Question 5 You are interested in finding a 95% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 15 randomly selected college students. Round answers to 3 decimal places where possible. 7 ▼ < 2 12 11 6 10 7 5 3 10 Submit Question 5 0 7 2 5 a. To compute the confidence interval use a ? distribution. b. With 95% confidence the population mean number of days of class that college students miss is between and days. c. If many groups of 15 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of missed class days and about percent will not contain the true population mean number of missed class days.
You measure 20 textbooks' weights, and find they have a mean weight of 45 ounces. Assume the population is normally distributed with a standard deviation of 3.7 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.Give your answers correct to at least two decimal places.Lower Limit = Upper Limit =
Question 8 A researcher must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 22.6 59.2 40.9 17.3 64.2 |35.6 Assuming the population of temperatures are normally distributed, find the 80% confidence interval. Round the answers to two decimal places. Enter your answer as an interval of the form (LB,UP). The researcher is 80% confident that the population average temperature is within the temperature interval Question Help: DVideo Submit Question 1jpg

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