Ei Normal Ex Fi Critical V x Ei Student C fi pling Jump to ern CHEM 2242 Fall14

Question

Ei Normal Ex Fi Critical V x Ei Student C fi pling Jump to ern CHEM 2242 Fall14 KRELLER Activities and Due Dates HW4: Statistics 9/7/2014 11:55 PM A 90.5/100 Gradebook Print Calculator Periodic Table Incorrect The silicon content (as a weight percent) of six different rock samples (each containing different amounts of Si) was measured by two different methods. Answer the following questions to determine if the two methods give results that are significantly different at the 95% confidence level. Sample Method A Method B What is tcalculated? 1 11.570 11.520 2 15.380 15,350 Number 3 17.950 17 880 6.85 4 22.810 22.840 5 25.110 25.180 what is table? 6 27.070 27.020 2.57 Are these methods significantly different at the 95% confidence level? O There is less than a 95% chance that the methods are different. O There is more than a 95% chance that the methods are different. There is additional feedback available! View this feedback by clicking on the bottom divider bar. Click on the divider bar again to hide the additional feedback. Close A Previous Give Up & View Solution Try Again ONext Exit Explanation Ordina... G Use A Table Listing The Ord... Du Online MCAT Tutors I MCAT... new textbook solutions x 1:53 AM 9/4/2014

Explanation / Answer

mean1 = 19.986
s.d1 = 6.013
n1 = 6

mean2 = 19.96
s.d2 = 6.034
n2 = 6

So t calculated = (19.986 - 19.96)/sqrt(6.013^2/6 + 6.034^2/6) = 7.476 x 10^-3 = 0.0075

t actual = 2.571

There is less than a 95% chance that the results are different.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.