Topic 6 Tutorial Questions
Do students at your school study more, less, or about the same as at other business schools?
Business week reported that at the top 50 business schools? Business Week reported that at
the top 50 business schools, students stu
Sampling Distribution Question
Given a normal distribution with = 100 and = 12, if you select a sample of n = 36, what
is the probability that X is
a) Less than 95?
b) Between 95 and 97.5?
c) Above 102.2?
d) There is a 65% chance that X is above what v
X ~ N(100, 102)
P(X > 85) = P (Z >
= P (Z > -1.5) = 1 - P (Z <= -1.5)
= 1 0.0668 = 0.9332
P(X < 80) = P (Z < -2) = 0.0228
P(X < 80 or X > 110) = P (Z < -2) + P (Z > 1) = 0.1815
d) P (Xlower < X < Xupper) = 0.8
P(Z < -1.28) = 0.10
The 3-D display makes it difficult to read the bars. Focusing at the front of each bar,
the side of each bar, or the back of each bar will give different impressions.
The x-axis goes from right to left, instead of the usual direction left to right, the
Topic 1 Tutorial Questions
The following graph shows the U.S. household income data in 1985.
(Source: The U.S. Department of Labor)
Critique the graph in terms of its layout, content and clarity
Figure 1 below shows the profits of ABC company from 2
If X =120, =24 and n=36, construct a 99% confidence interval estimate of the population mean,
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory.
A random sample of 100 greet
Each year, ratings are compiled concerning the performance of new cars during the first 90
days of use. Suppose that the cars have been categorized according to whether the car needs
warranty-related repair (yes or no) and the country in wh
Needs warranty- related repair
P(needs warranty repair) = 0.04
P(needs warranty repair and manufacturer based in U.S.) = 0.025