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 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 is11.1314.63Part: 1/ 3Part 2 of 3(b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim?Nothe confidence interval contains somev values greater than 13, so the claim is notcontradicted.Part: 2/ 3Part 3 of 3System PreferencesNOV...20...MacBook AirDD80888F10FBF9F7F6F5 Part: 1/ 3Part 2 of 3(b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim?Nothe confidence interval contains somev values greater than 13, so the claim is notcontradicted.Part: 2/ 3Part 3 of 3(c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0?The sample size would need to beMicrosoft WordNOV20..MacBook Air

Formula for the sample size needed to estimate a population mean is

Answered: Drill lifetime: A sample of 50 drills…

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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You may need to use the appropriate appendix table or technology to answer this question. A sample of 169 cans of coffee showed an average weight of 128 ounces. The standard deviation of the population is known to be 1.1 ou (a) Construct a 68.26% confidence interval for the mean of the population (in ounces). (Round your answers to two decimal places.) oz to (b) Construct a 97% confidence interval for the mean of the population (in ounces). (Round your answers to two decimal places.) oz to 02 (c) Discuss why the answers in parts (a) and (b) are different As the level of confidence increases, the entire confidence interval shifts farther to the left. O As the level of confidence increases, the confidence interval becomes narrower. As the level of confidence increases, the confidence interval becomes wider. © As the level of confidence increases, the entire confidence interval shifts farther to the right O The answers in parts (a) and (b) are actually the same.
A random sample of 5 fields of rye has a mean yield of 21.3 bushels per acre and standard deviation of 2.53 bushels per acre. Determine the 99 % 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.
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 biologist examines 29 seawater samples for iron concentration. The mean iron concentration for the sample data is 0.334 cc/cubic meter with a standard deviation of 0.0139. Determine the 99% confidence interval for the population mean iron concentration. 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. Step 2 of 2: Construct the 99% confidence interval. Round your answer to three decimal places.
A geologist examines 1414 geological samples for mercury concentration. The mean mercury concentration for the sample data is 0.4660.466 cc/cubic meter with a standard deviation of 0.04530.0453. Determine the 90%90% confidence interval for the population mean mercury concentration. 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 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.
Import the data from the Hill City Excel file into Minitab.You are trying to predict Price.Note: Mtn View=1 if there is a mountain view, 0 otherwise. The rest of the variables should be self explanatory. 1.Perform an F Test for overall significance of the model 2.Perform a T test for slope for the age variable 3. Find a 95% confidence interval for the slope of the SqFeet variable4. Create a prediction, CI, and PI for 1 new set of x values (any valid numbers you want), and interpret each.5. Run the residual plots and indicate if they show any problems with the model.
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.
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 =
You need to compute the a 90% confidence interval for the population mean. How large a sample should you draw to ensure that the sample mean does not deviate from the population mean by more than 1.5? (Use 9.2 as an estimate of the population standard deviation from prior studies.) (You may find it useful to reference the z table. Round intermediate calculations to at least 4 decimal places. Round "z" value to 3 decimal places. Round up your answer to the nearest whole number.) Sample size

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