Average entry level salaries for college graduates with mechanical engineering degrees and electrical engineering degrees are believed to be approximately the same. A recruiting office thinks that the average mechanical engineering salary is actually lower than the average electrical engineering salary. The recruiting office randomly surveys 50 entry level mechanical engineers and 60 entry level electrical engineers. Their average salaries were $46,100 and $46,700, respectively. Their standard deviations were $3450 and $4210, respectively. Conduct a hypothesis test to determine if you agree that the average entry level mechanical engineering salary is lower than the average entry level electrical engineering salary. (Show all your work i.e. Ho and Ha, p-value, conclusion in words)

Question

jay · Answer

'Usa today reported on the results of an opinion poll in which 63% of adults said they would sleep if they were sick. 18% said they would watch t.v The poll included poll of 1,000 respondents. Construct a 90% confidence interval for the true percentage of adults who would watch t.v if they are home

PsyDAG · Answer

Ho: M = E
Ha: M < E

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√n

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability
related to the Z score.

PsyDAG · Answer

If you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.