Question: Fractures in metals have been studied and it is thought that the rate at which fractures expand is normally distributed. A sample of 14 pieces

Fractures in metals have been studied and it is thought that the rate at which fractures expand is normally distributed. A sample of 14 pieces of a particular steel gave X =

3205 ft∕s.

(a) Find a 95% confidence interval for ????, the true average rate of expansion, if ???? is assumed to be 53 ft/s.

(b) Now suppose ???? is unknown. The sample variance is 6686.53 (ft/s)2. Find a 95%

confidence interval for ????.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Elementary Probability For Applications Questions!

The Fleming Medical Group has had a modest net income recently, and the first six months of 2 0 2 2 indicate that their profit margin may be less than 2 % if current performance continues. The owners...

Two Discussion Questions. A minimum of 200 words per question. Both questions are attached to the word document and each chapter to both questions are attached to the PDF. Any references/citations...

Confirming Pages C H A P T E R 19 Analyzing Information and Writing Reports Chapter Outline Using Your Time Efficiently Analyzing Data and Information for Reports Identifying the Source of the Data...

Torts Law 1. (1) What are the key principals of a defamation lawsuit by a public figure and why it is more difficult to succeed? (2) What are the key differences between trespass to chattel and...

Discuss the following operations categories for this site in relation to company and operations strategy: capacity, facilities, technology, vertical integration, sourcing, work force, quality,...

SMU-11-0002 Educational material supplied by The Case Centre Copyright encoded A76HM-JUJ9K-PJMN9I Order reference F302540 r thee new marketting forecastss for this moonth's planninng Catthy Wong...

Each separate response must have approximately 200 words. Assignments vary widely; however, essays should be written in APA style, with in-text citations and a separate reference listing as...

ATC 14-1 (Pg. 686) 1.(Follow the cash) In a narrative format, answer the questions posed in the case. 2.What is meant by "presentation of financial statement information in common-size amounts rather...

Each separate response must have approximately 200 words. Assignments vary widely; however, essays should be written in APA style, with in-text citations and a separate reference listing as...

Which tutor needs to be reminded to turn in reports? Write the SQL command. Show how you constructed this query using a Venn or other type of diagram.

What is the interval notation for the solution set of: -3x+3greater than or equal -2+2x |

The value of both call and put options are always positively related to the: 1 ) volatility of the underlying stock price 2 ) time to expiration 3 ) risk - free rate Question 1 6 Answer a . 1 and 2...

Describe the relationships and differences between hackers and viruses.