math
posted by tracy10 .
The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount of corrosion on the coated portion subtracted from the amount of corrosion on the uncoated portion. Does this random sample provide sufficient reason to conclude that the coating is beneficial? Use á = 0.01 and assume normality.
n = 48, Ód = 238, Ód2 = 6202
(a) Find t. (Give your answer correct to two decimal places.)
(ii) Find the pvalue. (Give your answer correct to four decimal places.)

SSd = 6202  (238)^2/48
SSd = 5201.917
Sd = sqrt(SSd/n1)
Sd = sqrt(5021.917/47) =
Sd = 10.337
t = 4.958/10.337/sqrt(48)
t = 3.323
Two tail = .0017
right tail = 8.6885e^4
Left tail = .9991 
Have a question, where did you get the 4.958 and what did you look at for it. Thanks this has really helped so far, just unsure on that.

This is mean = 238/48 = 4.985
I am looking for t. 
Typo
238/48 = 4.958 
But how do you get the pvalue, I have worked it out by hand and also put into calculator and it comes up wrong. 0.0017 was the last answer I got. and 0.9991 before that. I have several questions like this asking for pvalue so if you could work one out and I could use as an example I would appreciate it. Thank you for all your help. I got the t as 3.32 and that was the right answer on that one.

First of all, you have to calculate your mean, standard deviation
sum of d is 238
n is 48
Mean = 238/48 = 4.958
Variance = 6202 238^2/48 = 5201.92
standard derivation sqrt((variance/n1)
Sd = 10.337
Find pvalue you use your ti83 plus
Go to stat
Tests
2TTest
Enter mean = 4.958
Go to down to Sx then
Standard deviation or sx = 10.337
n =48
Select Not equal
Go to down and select calculate enter
It will you info
Respond to this Question
Similar Questions

material engineering
Thank you so much drwls ... please, Do you mean is also possible to choose tincoated steel for (Beverage cans)? 
statistics
Can any help me how to solve below problem.? 
math
A fifth grade class collected data about class spending per month on various items. Below are some of the results. A median amount of $6 per month was spent for books and magazine. A median amount of $10 per month was spent for tapes … 
probability April004
In a random sample of 95 sections of pipe in a chemical plant, 16 showed signs of serious corrosion. Construct a 98% confidence interval for the true proportion of pipe sections showing signs of serious corrosion, using the large sample … 
Math question
How do you find the pvalue, on a problem like below. The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, where d is the amount … 
Statistics
Please Help! If someone could just show me how to do a problem like this! The corrosive effects of various soils on coated and uncoated steel pipe was tested by using a dependent sampling plan. The data collected are summarized below, … 
statistics
Data were collected on 100 students regarding their class and major. The data are summarized in the following contingency table. What is the probability of randomly selecting a sophomore or an undeclared student? 
CHEMISTRY
Can a substance made of zinc be coated by nickel , using nickel nitrate solution ? 
physics
A capacitor is rolled from two strips of aluminum separated by two strips of paraffincoated paper. Each strip is 5.40cm wide. The foil is 7.00μm thick, and the paper is 50.0μm thick. What length, in cm, should the strips … 
soil and palnt analysis
Acidic soil sample collected from HagreSelam location of southern Ethiopia was analysed in the laboratory had exchangeable Al content of 4.5 meq/100 gram of soils and its bulk density was found to be 1.25 g/cm3. Based on this information …