Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 11 Solutions
1.
(i) Based on the results of last exercise, data, we get
n = 12,
xi = 8589,
yi = 103.34,
xi yi = 76997.25,
2
x2 = 6450413,
yi = 922.035
i
b1
b0
SST
SSE
SSR
r2
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 10 Solutions
1.
(i) Based on the data, we nd
n = 12,
xi = 8589,
yi = 103.34,
2
x2 = 6450413,
yi = 922.035
i
b1 =
xi yi = 76997.25,
SSXY
(76997.25) (8589)(103.34)/12
3031.645
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 9 Solutions
1.
Given that xA = 120, sA = 29.25, nA = 180 and xB = 111, sB = 28.95, nB = 160
We need to assume that the variances of bills in city A and city B are the same an
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 8 Solutions
1.
Let be the population mean amount in ounces.
(i) H0 : = 8.17
H1 : = 8.17
Since the sample size (n = 60 > 30) is sucient large, by the Central Limit
Theorem, th
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 7 Solutions
1.
(i) Given that x = 21.34, s = 8.53 and t0.025,449 1.96
We do not need to make any assumption. Since the sample size is relatively
large, the sample mean is app
Term I, 10/11
STAT 101 INTRODUCTORY STATISTICS - GROUPS 2, 3, & 4
Class Exercise 1 Solutions
1.
It is unethical and impractical to force a group of students buying the recommended
textbooks and to restrict the other group of students not buying the textbo