![subject](/tpl/images/cats/mat.png)
Mathematics, 05.03.2020 22:58 nakeytrag
Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price of these bulbs is very favorable, so a potential customer has decided to go ahead with a purchase arrangement unless it can be conclusively demonstrated that the true average lifetime is smaller than what is advertised. A random sample of 50 bulbs was selected, the lifetime of each bulb determined, and the following information obtained:
Average lifetime = 738.44 hours and a standard deviation of lifetimes equal to 38.2 hours.
Should the customer purchase the light bulbs?
(a) Make the decision on a significance level of .05?
(b) Make the decision on a significance level of .01?
![ansver](/tpl/images/cats/User.png)
Answers: 2
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:30
Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 15:20
Beth took out a $20,000 loan for college she is borrowing money from two banks. bank a charges an interest rate of 8.5% bank b charges and interest rate of 10.5% after one year alice owes $1860 in interest how much money did she borrow from bank a
Answers: 3
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 20:30
Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.
Answers: 1
![question](/tpl/images/cats/mat.png)
You know the right answer?
Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price of...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 20.10.2019 01:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.10.2019 01:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 20.10.2019 01:00
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
English, 20.10.2019 01:00
![question](/tpl/images/cats/fizika.png)
Physics, 20.10.2019 01:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 20.10.2019 01:00
![question](/tpl/images/cats/mat.png)
Mathematics, 20.10.2019 01:00
![question](/tpl/images/cats/mat.png)
Mathematics, 20.10.2019 01:00
![question](/tpl/images/cats/istoriya.png)
History, 20.10.2019 01:00
![question](/tpl/images/cats/istoriya.png)
History, 20.10.2019 01:00