Find a confidence interval for difference in the mean time

Assignment Help Basic Statistics

Reference no: EM131384517

The Occupational Safety and Health Administration (OSHA) mandates certain regulations that have to be adopted by corporations. Prior to the implementation of the OSHA program, a company found that for a sample of 40 randomly selected months, the mean employee time lost due to job-related accidents was 45 hours. After implementation of the OSHA program, for a random sample of 45 months, the mean employee time lost due to job-related accidents was 39 hours. It can be assumed that the variability of time lost due to accidents is about the same before and after implementation of the OSHA program (with a standard deviation being 3.5 hours).

(a) Find a 90% confidence interval for the difference in the mean time lost due to accidents.

(b) Test the hypothesis that implementation of the OSHA program has reduced the mean employee lost time. Use a level of significance of 0.10.

Reference no: EM131384517

Questions Cloud

Find a two sided confidence interval for mean assembly time : Find a two-sided 90% confidence interval for the mean assembly time and interpret it.- Find a two-sided 99% confidence interval for the mean assembly time and interpret it.

How many devices escape the test : If the upper test limit is reduced to 1.74 V, how many devices escape on account of measurement error?

Is the company violating the standard : Find a two-sided 95% confidence interval for the mean dissolved oxygen and interpret it.- What assumptions do you need to make to answer part (a)?

Describe the key variables within the study : Cost-benefit analyses are designed to do just what their name implies-weigh the costs and benefits of a program or policy. This is important because, in a world of finite resources, people want to make sure that funds are allocated to programs tha..

Find a confidence interval for difference in the mean time : Test the hypothesis that implementation of the OSHA program has reduced the mean employee lost time. Use a level of significance of 0.10.

Test the hypothesis that implementation of the osha program : Test the hypothesis that implementation of the OSHA program has reduced the mean employee lost time. Use a level of significance of 0.10.

Discuss about the post given below : A description of the criminal justice issue you selected. Proation & Parole Recidivism.The research question you are examining and hypothesis(-es) you plan to test.An explanation of whether you would use qualitative, quantitative, or mixed research m..

What is the rms noise voltage at the rc fi lter output : If the we decrease the capacitor value to 2.2 μF, what is the RMS noise voltage at the RC fi lter output?

What is the size of the uncalibrated error : Using the setup and results of Problem 5.14, what is the calibrated level when a 2.13 V level is measured at the filter-buffer output? What is the size of the uncalibrated error?

User Account

All Pages