![subject](/tpl/images/cats/mat.png)
Mathematics, 25.04.2020 05:01 harris435942
In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 52 hours. Find a 95% confidence interval for the mean lifetime of this type of light bulb. Find a 98% confidence interval for the mean lifetime of this type of light bulb. An engineer claims that the mean lifetime is between 1208 and 1226 hours. With what level of confidence can this statement be made? How many light bulbs must be sampled so that a 95% confidence interval will specify the mean lifetime to within ±8 hours? How many light bulbs must be sampled so that a 98% confidence interval will specify the mean lifetime to within ±8 hours?
![ansver](/tpl/images/cats/User.png)
Answers: 2
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:30
Aparking lot is to be 400 feet wide and 370 feet deep. how many standard-sized cars fit in this lot considering a double-loaded (w4) two way traffic set up, an angle of 90° and a sw of 9’ 0’’? (do not consider handicapped parking spaces, and consider 15’ for turning aisles). show your work.
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:50
Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:00
Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w
Answers: 1
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:00
Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain
Answers: 2
You know the right answer?
In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 52 hour...
Questions
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/istoriya.png)
History, 11.02.2021 20:10
![question](/tpl/images/cats/en.png)
English, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
History, 11.02.2021 20:10
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10
![question](/tpl/images/cats/mat.png)
Mathematics, 11.02.2021 20:10