Small sample: Twenty concrete blocks were sampled and tested for crushing strength in order to estimate the proportion thatwere sufficiently strong for a certain application. Eighteen of the 20 blocks were sufficiently strong. Use the small-sample methodto construct a 90% confidence interval for the proportion of blocks that are sufficiently strong. Round the answers to at least threedecimal places.A 90% confidence interval for the proportion of blocks that are sufficiently strong is0.79 T

Answered: Image /qna-images/answer/2eca9f10-bd2d-4ace-871b-9c2f759931bb.jpg

Answered: Small sample: Twenty concrete blocks…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Pain after surgery: In a random sample of 42 patients undergoing a standard surgical procedure, 15 required medication for postoperative pain. In a random sample of 90 patients undergoing a new procedure, only 11 required pain medication. Part: 0 / 2 Part 1 of 2 (a) Construct a 95% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. Let p, denote the proportion of patients who had the old procedure needing pain medication. Use tables to find the critical value and 1 round the answer to at least three decimal places. A 95% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures is
High-power experimental engines are being developed by the Stevens Motor Company for use in its new sports coupe. The engineers have calculated the maximum horsepower for the engine to be 800HP800⁢HP. Twenty five engines are randomly selected for horsepower testing. The sample has an average maximum HP of 870870 with a standard deviation of 80HP80⁢HP. Assume the population is normally distributed. Step 1 of 2 : Calculate a confidence interval for the average maximum HP for the experimental engine. Use a significance level of α=0.01α=0.01. Round your answers to two decimal places.
Hypotheses for a statistical test are given, followed by several possible confidence intervals for different samples. In each case, use the confidence interval to state a conclusion of the test for that sample and give the significance level used. Hypotheses: Ho :p = 0.7 vs Ha:p + 0.7 (a) 95 % confidence interval for p: 0.55 to 0.85 Conclusion: v Ho Significance level: (b) 95 % confidence interval for p: 0.84 to 0.90 Conclusion: Ho Significance level: (c) 99 % confidence interval for p: 0.66 to 0.82 Conclusion: Но Significance level:
Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and o = 11.3. Assume the population is normally distributed. A 90% confidence level requires a sample size of. (Round up to the nearest whole number as needed.)
0.56 ppm is the maximum authorized concentration of phosphate in drinking water. Given below is the analysis of various samples of bottled water from the same batch of production. Is there an outlier present in the data set at 95% confidence interval? What is the t-tab and t-calc for the data set? Can the water be used for drinking? Use outlier tests Sample Phosphate (ppm) 1 0.26 2 0.46 3 0.41 4 0.49 5 0.38
Create and interpret the following tests using the following data: confidence interval, t-test, p-value and F- test Y = weekly sales X = advertisement cost Model: Y = 2.6911 -0.4795 X SE (0.1216) SE (0.1140) HO: b0 = 0 a = 0.05 tcrit = 2.2622 RSS = 33.27 H1: b0 + 0 n = 11 ESS = 8552.73
Estimate the minimum sample size needed to achieve the margin of error E = 0.029 for a 95% confidence interval The minimum sample size is (Round up to the nearest integer.)
Pain after surgery: In a random sample of 54 patients undergoing a standard surgical procedure, 15 required medication for postoperative pain. In a random sample of 94 patients undergoing a new procedure, only 16 required pain medication. Part: 0/ 2 Part 1 of 2 (a) Construct a 99% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. Let p, denote the proportion of patients who had the old procedure needing pain medication. OL Use tables to find the critical value and round the answer to at least three decimal places. A 99% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures is
In order to compare the means of two populations, independent random samples of 410 observations are selected from each population, with the results found in the table to the right. Complete parts a through e below. BOCO Sample 1 x₁ = 5,260 $₁=155 Sample 2 X₂=5,232 $2=200 a. Use a 95% confidence interval to estimate the difference between the population means (H₁-H2)- Interpret the confidence interval The confidence interval is (0) (Round to one decimal place as needed.)
Estimate the minimum sample size needed to achieve the margin of error E = 0.029 for a 95% confidence interval. The minimum sample size is an example (Round up to the nearest integer.)
Question: For a confidence level of 90% with a sample size of 18, find the critical t value. For a confidence level of 90% with a sample size of 18, find the critical tvalue.
A researcher is interested in estimating the mean weight of a semi trailer truck to determine the potential load capacity. She takes a random sample of 17 trucks and computes a sample mean of 20,000 pounds with sample standard deviation of 1,500. The 95% confidence interval for the population mean weight of a semi trailer truck is ______________. 19,232 to 20,768 19,367 to 20,633 19,229 to 20,771 18,500 to 21,500 19,365 to 20,635

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS