Level of significance-variability unchanged

Reference no: EM1318334

A plastic has a mean breaking strength 27 and a standard deviation of 6 pounds per square inch. A new process is developed and will replace the old one, provided that there is substantial evidence that it improves the strength of the product. A random sample of 40 pieces made with the new process gives a sample mean of 30 pounds per square inch.

Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?

Reference no: EM1318334

Questions Cloud

Find the height of the flag pole : Find the height of the flag pole from the word problem and determine the total number of student-tickets sold from given word problem

Calculation and depiction of normal probabilities : On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.

Legal and ethical issues : What legal and ethical issues are apparent in these events? Have fiduciary duties owed to the LLC been violated? Are there any additional facts that we would need to find out in order to resolve this dispute?

Solve the system with any method : Solve the system with any method - Find which of the given two pairs are solutions for the following system

Level of significance-variability unchanged : Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?

Solve the system using the graphing method : Find the Equation of the line which passes through the two given points and Solve the system using the graphing method.

Case study of minneapolis pipelines : Minneapolis Pipelines pays an annual dividend of $.80 per share on its preferred stock. The stock currently sells for $12 per share.

Explain one sample z test for p-value approach : Find out the test statistic P-value, and critical value, and state the final conclusion. The mean IQ score of statistic professors is less than 120. Sample data: n = 46. Suppose that = 17, and the significance level is = 0.05.

Evaluate the equation of the line : Evaluate the Equation of the line which passes through the two given points and Write down the equations of the line described in the following questions

User Account

All Pages