A sample of 10 longleaf pine trees each are taken from the
western and eastern halves of the Wade Tract in Thomas County,
Georgia. The diameters for the trees are given:
Western
17.2
44.6
44.1
35.5
51
21.6
44.1
11.2
36
42.1
Eastern
23.5
43.5
6.6
11.5
17.2
38.7
2.3
31.5
10.5
23.7
(a) Is there a difference between the mean diameters of the
trees in the two halves? Perform a test of significance at level α
= .05 based...
Suppose 10 red and 10 white balls are randomly distributed into
100 boxes. Let X be the total number of red balls in the first 25
boxes and Y be the total number of white balls in the first 75
boxes.
a) Find P(X + Y ≤ 1).
b) E(Y − X).
An
urn contains 12 red balls, 10 white balls, and 5 black balls. You
select theee balls from the urn at random without replacement.
Compute the following probabilities:
A) You do not select a ball of each color
B)You select only res balls
Select the false statement below regarding PbI2 (Ksp =
7.9 x 10−9) and PbCO3 (Ksp = 7.4 x 10−14).
A. PbCO3 is more soluble in 1.0 M Pb(NO3)2
than in pure water
B. PbCO3 is more soluble in 1.0 M HCl than in pure
water
C. the molar solubility of PbI2 can be calculated by taking the
cube root of (Ksp/4)
D. PbI2 is more soluble in 1.0 M NaOH than in pure
water (Kf of Pb(OH)3− = 8 x...