subject
Mathematics, 17.06.2020 12:57 orangeicecream

A foreign company which manufactures electric bulbs has assured its customers that the lifespan of the bulbs is 28 month. Recently the company embarked on a quality improvement research for their product. After the research using new technology, a sample of 70 bulbs was tested and they gave a mean lifespan of 30.2 months with a standard deviation of 4months. Does this justify the research undertaken? the critical value of the one tailed test at 1% level of significance to conduct a statistical test in order to establish the truth about the above question + 2.33. I need answer Thanks

ansver
Answers: 1

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 12:30, 101EXPERIENCE
Iam so stuck. what is the worked out answer for this question?
Answers: 1
image
Mathematics, 21.06.2019 14:00, brookeguilford
If benito is selecting samples of five values from the table, which row will result in the greatest mean? row 1 row 2 row 3 row 4
Answers: 2
image
Mathematics, 21.06.2019 19:00, arizmendiivan713
What is the frequency of the sinusoidal graph?
Answers: 2
image
Mathematics, 21.06.2019 19:20, axelsanchez7710
The suare root of 9x plus 7 plus the square rot of 2x equall to 7
Answers: 1
You know the right answer?
A foreign company which manufactures electric bulbs has assured its customers that the lifespan of t...

Questions in other subjects:

Konu
Mathematics, 11.10.2019 16:30
Konu
Social Studies, 11.10.2019 16:30
Konu
Social Studies, 11.10.2019 16:30