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 )...

...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 ...

...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...

...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...

...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
*...

...Business in Asia
Tutorial Program Semester 2, 2014
Guide Notes
Tutorial4: Japan: Changing business environment - growth, stagnation and Abenomics
1. Outline very briefly the main factors that led to the bubble economy of the 1980s and
its crash?
The appreciation of the Yen following the Plaza Accords under US pressure and
the policy responses.
Japanese industries lost international competitiveness and the economy
slowed. The government loosened...

...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...

...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. The tutorials...