INFO 1410 Tutorial 4 1 What are the advantages of using a glass substrate for a magnetic disk? Improvement in the uniformity of the magnetic film surface to increase disk reliability. A significant reduction in overall surface defects to help reduce read/write errors. Ability to support lower fly heights (described subsequently). Better stiffness to reduce disk dynamics. Greater ability to withstand shock and damage Explain the difference between a simple CAV system and a multiple zoned recording system For the constant angular velocity (CAV) system, the number of bits per track is constant. An increase in density is achieved with multiple zoned recording, in which the surface is divided into a number of zones, with zones farther from the center containing more bits than zones closer to the center. Define the terms track, cylinder and sector On a magnetic disk. data is organized on the platter in a concentric set of rings, called tracks. Data are transferred to and from the disk in sectors. For a disk with multiple platters, the set of all the tracks in the same relative position on the platter is referred to as a cylinder. What is the typical disk sector size? 512 bytes. Define the terms seek time, rotational delay, access time, and transfer time On a movable-head system, the time it takes to position the head at the track is known as seek time. Once the track is selected, the disk controller waits until the appropriate sector rotates to line up with the head. The time it takes for the beginning of the sector to reach the head is known as rotational delay. The sum of the seek time, if any, and the rotational delay equals the access time, which is the time it takes to get into position to read or write. Once the head is in position, the read or write operation is then performed as the sector moves under the head; this is the data transfer portion of the operation and the time for the transfer is the transfer time. What common characteristics are shared by all...

...MAT 2204
Tutorial4
1. In how many ways can a committee of one president, one vice president, a secretary and a treasurer be chosen from five men and seven women?
2. A committee of four is chosen from five teachers and three mathematicians. In how many ways can this be done so that the committee contains
(i) at least one teacher?
(ii) at least one teacher and one mathematician?
3. Five children are to be seated on a bench. Find
( i ) how many ways the children can be seated ,
( ii ) how many arrangements are possible if the youngest child is to sit at the
left-hand end of the bench.
4. A playoff between two teams consists of at most five games . The first team that wins three games wins the playoff . In how many different ways can the playoff occur ?
5. An athlete owns six pairs of running shoes. How many different ways are of selecting
(i) 4 shoes?
(ii) 2 left shoes and 2 right shoes?
(iii) 2 pairs of shoes?
6. Suppose that a department contains 10 men and 15 women. How many ways are there to
form a committee with 6 members if it must have the same number of men and women?
7. A concert pianist agrees to take part in a charity concert. She offers a choice of 10 works, of which 5 were composed by Chopin, 3 by Liszt and 2 by Schuamann. The concert committee is to select 4 of these works. Calculate the number of ways these...

...Tutorial4: Estimations
1. A process producing bricks is known to yield output whose weights are normally distributed with a standard deviation of 0.12lb. A random sample of 40 bricks from a day's output had a mean weight of 4.07lb.
(i) Find a 99% confidence interval for the mean weight of all bricks produced on that day.
(ii) Estimate the smallest sample size required if the error in estimating the population mean weight of all bricks is to be within 0.03lb with 95% confidence.
2. A house cleaning service claims that they can clean a four bedroom house in less than 2 hours. A sample of n = 16 houses is taken and the sample mean is found to be 1.97 hours and the sample standard deviation is found to be 0.1 hours. Construct a 95% confidence interval for the population mean of cleaning times.
3. The length (in millimetres) of a batch of 9 screws was selected at random from a large consignment and found to have the following information.
8.02 8.00 8.01 8.01 7.99 8.00 7.99 8.03 8.01
Construct a 95% confidence interval to estimate the true average length of the screws for the whole consignment.
4. A manager of a factory that manufactures a component of a particular machine wants to assess the proportion of the defective items form the production floor. He has selected a random sample of 300 items and finds that 45 of them are defective.
(i) Calculate the 95% confidence interval for the proportion of...

...Tutorial solutions 4
QUESTIONS
5. What is meant by a currency trading at a discount or at a premium in the forward market?
Answer: The forward market involves contracting today for the future purchase or sale of foreign
exchange. The forward price may be the same as the spot price, but usually it is higher (at a
premium) or lower (at a discount) than the spot price.
PROBLEMS
4. Restate the following one-, three-, and six-month outright forward European term bid-ask
quotes in forward points.
Spot
1.3431-1.3436
One-Month
1.3432-1.3442
Three-Month
1.3448-1.3463
Six-Month
1.3488-1.3508
Solution:
One-Month
01-06
Three-Month
17-27
Six-Month
57-72
6. Using Exhibit 5.4, calculate the one-, three-, and six-month forward premium or discount for
the Canadian dollar versus the U.S. dollar using American term quotations.
assume each month has 30 days. What is the interpretation of your results?
Solution: The formula we want to use is:
f
= [(F($/CD) - S($/CD))/S($/CD)] x 360/N days
f 30 = [(.9628 - .9629)/.9629] x 360/30 = -.12%
f 90 = [(.9624 - .9629)/.9629] x 360/90 = -.21%
f 180 = [(.9614 - .9629)/.9629] x 360/180 = -.31%
For simplicity,
The pattern of forward premiums indicates that the Canadian dollar is trading at a discount
versus the U.S. dollar. That is, it becomes less expensive to buy a Canadian dollar forward.
Also, the discount increases in magnitude over time.
10. Doug Bernard specializes in cross-rate...

...TUTORIAL4 – DISCRETE DISTRIBUTIONS
Question 1
An experiment consists of picking a card at random from a standard deck of cards and replacing it. If this experiment is performed 12 times, what is the probability that you get:
(a) exactly 2 aces;
(b) exactly 3 hearts;
(c) more than 1 heart.
Solution
Let n = 12, the no of experiments.
(a) Let p = probability of obtaining an ace in an experiment of picking a card at
random from a standard deck of cards; and
= 4/52 = 1/13
let x = no of aces obtained in 12 experiments.
Pr(x = 2) = 12C2 (1/13)2(12/13)10
= 0.1754
(b) Let p = probability of obtaining a heart in an experiment of picking a card at
random from a standard deck of cards; and
= 13/52 = 1/4
let x = no of hearts obtained in 12 experiments.
Pr(x = 3) = 12C3 (1/4)3(3/4)9
= 0.2581
(c) With p and x defined from (b),
Pr(x > 1) = 1 – Pr(x = 0) – Pr(x = 1)
= 1 – 12C0 (1/4)0(3/4)12 – 12C1 (1/4)1(3/4)11
= 1 – 0.0317 – 0.1267
= 0.8416
Question 2
In a small town, there are two post offices. The number of customers arriving at each of the post office is a Poisson process, with an average of 6 customers per hour at post office A, and 4 customers per hour at post office B. The number of customers arrival at the two post...

...Tutorial4
Review questions:
1- What does the term internal control mean?
The Committee of Sponsoring Organizations of the Treadway Commission (COSO) defines internal control as:
* “ a process, affected by an entity’s board of directors, management and other personnel, designed to provide reasonable assurance regarding the achievement of objectives in the following categories”
* Effectiveness and efficiency of operations
* Reliability of financial reporting
* Compliance with applicable laws and regulations
2- What are the five components of an internal control framework?
i. CONTROL ENVIRONMENT
* Influencing the control consciousness in organization
* The foundation of all internal control
* Control environment factor
* Integrity, ethical values, competence of organization people
* Management philosophy and operating style
* The way management assigns authority and responsibility, organizes and develops its people
* Attention and direction provided by BOD
ii. RISK ASSESSMENT
* Assessment of internal and external risk in achieving organization’s objectives
* Economic, industry, regulatory and operating condition will continually change
* Identify and address the specific risk associated with change.
iii. CONTROL ACTIVITIES
* All policies and procedures to ensure management directives are carried out
*...

...Lecturers
:
:
:
Centre for Foundation Studies
Foundation In Science
Year 1 Trimester 1
Unit Code
Unit Title
Session
:
:
:
FHSC1114
Physical Chemistry
2015/05
:
Ms. Amelia Chiang, Ms. Azlina Banu, Ms. Farhanah, Ms.Gurpreet, Ms. Jamie,
Ms. Lau Mei Chien, Ms. Lily Lee, Ms. Nabilah, Mr. Ng Sweet Kin, Ms. Phang
Ying Ning, Ms. Precilla, Ms. Rachel Tham, Ms. Rajalakshmi, Mr. Sivabalan,
Ms. Tan Lee Siew
Tutorial4: Chapter 4 States of Matter
1.
Hydrogen gas occupies a 3.60 L container at 760 torr. Calculate the volume it occupies at
2.25 atm at a constant temperature.
(1.6 L)
2.
Nitrogen gas contained in a 1.85 L vessel exerts a pressure of 1.00 atm at 0 oC. Determine
the required change in temperature to increase the pressure of nitrogen gas to 1.65 atm
after it has been transferred to a 1.50 L vessel.
(92.297)
3.
An empty tank of 3 dm3 has a mass of 897.3 g. It is filled with propane gas, C3H8, at 25
o
C to a pressure of 3.30 atm. Calculate the mass of the tank after it is filled.
(Assuming that the expansion of the tank from an increase in temperature is negligible)
(915.141 g)
4.
A mixture of noble gases contains 4.46 moles of Neon and 0.74 moles of Krypton and y
mole of Xenon at a pressure of 2 atm.
(a)
Determine y mole of Xenon if the partial pressure of Neon is 1.214 atm.
(2.148 moles)
(b)
Determine the partial pressure of Krypton.
[Sep 2014]
(0.2 atm)
5.
Calculate the number of moles of sulfur...

...ACL 9
Tutorial4
COMMANDS:
ANALYZE -> AGE
DATA -> JOIN
DATA -> MERGE
The tutorials in this folder are supplemental exercises that relate to ACL 9 topics covered in chapters 8, 9, 10, and 12 in the Hall, IT Auditing, 3rd edition textbook. The tutorials presume that the student has installed ACL from the CD accompanying the text and has worked through the ACLStart.pdf document in the ACL Manual folded. Thetutorials are not a substitute for this basic ACL knowledge.
These tutorials use data tables stored in the Sample Project.acl that is automatically installed with ACL. Open the sample project and click on the appropriate table to perform the tutorial. The name of the table is indicated in bold type prior to each section in the tutorial (e.g. AP TRANS).
AR
1. The Aging of Accounts Receivable is a frequently used audit technique that is supported by the AGE command in ACL:
(a) Using AGE, develop an aging report of current, 30, 60, 90, 120, and above 120 days past due accounts. Set the cutoff date at December 31, 2000. Age on the DUE date field. Create a filter to include only Invoice type [IN] in the report.
-lots of uncollected money
EMPMAST
2. JOINING, RELATING, AND MERGING DATA
The JOIN command will combine the fields of two files with different structures to produce a third file. In ACL, this task requires one...