2. A quality control engineer finds that a sample of 100 light bulbs had an average life time of 470 hours. Assuming a population mean of 480 hours with standard deviation of g = 25 hours. Test whether data indicates the mean life time of bulbs is less than 480 hours at 5% level of significance. a). Write down all the details given in the problem [2 points]
b). State the hypotheses [6 points]
c). Find the critical value and draw in on a bell curve [2 points]
d). Calculate the test statistic [5 points]
e). Find p-value [4 points]
f). What is your decision? [2 points]
g). Interpret your decision in context of the problem. [4 points]

12

Step-by-step explanation:

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

answer

false

explanation

these practices describe the manner the land use outcome is attained. land management methods implemented by corporations are a mandatory because they are a driver for better land use results economically, socially and environmentally. corporations are required to understand the connection between land use , and land management practices to support sustainable land use policies