Group Project Berk DeMarzo Data Case chapter 10 1. Collect price information for each stock from Yahoo! Finance Professor has provided it for us. The specific data of question 2-4 is in the appendix. We only include the functions and simple answers below every question. 2. Return=(P2-P1)/P1 3. mean monthly returns‚ standard deviations for the monthly returns and annual statistics Ticker | AAPL | ADM | BA | C | CAT | DE | HSY | MOT | PG | SIRI | WMT | YHOO | Mean
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Thunderbird. Weibo Jan 22 – Feb 22 (Monthly Data) Weibo: Engagement: 20+8/363=7.71% Increased from 345 to 363 Growth Rate of Followers: 345-363/345 = 5.21% Weibo Feb 23 – Mar 23 (Monthly Data) Engagement: 20+9/375=7.73% Growth Rate of Followers: 363-375/363 = 3.34% Renren.com Jan 22 – Feb 22 (Monthly Data) Engagement: 4/40 = 10% Increased 4 followers from 36 Growth Rate of Followers: = 36-40/40=10% Renren.com Feb 23 – Mar 23 (Monthly Data) Engagement: 3/47 = 6.4% Increased
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Types of Data Integrity This section describes the rules that can be applied to table columns to enforce different types of data integrity. Null Rule A null rule is a rule defined on a single column that allows or disallows inserts or updates of rows containing a null (the absence of a value) in that column. Unique Column Values A unique value rule defined on a column (or set of columns) allows the insert or update of a row only if it contains a unique value in that column (or set of columns)
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2.2.3 Data Collection Another crucial stage that cannot be ignored is deciding on the type and nature of data that is to be used in the research. Ideally‚ there are three types of data that a researcher can collect using primary research. First‚ the data can be quantitative in nature. This refers to data that is capable of been converted into a numerical value (Kothari 2004). One of the benefits of quantitative data is that its measurement does not require critical reviews‚ making it easy to collect
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Distinguish between primary data and secondary data? Primary data is the data that is collected first hand from the original source for the purpose of making statistical inference while secondary data is the data that is collected by the method of abstraction and is used to make statistical inference by using primary data already collected by an investigator. Primary data is collected by Identifying population of interest choosing sample analyse sample information draw inference from sample
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buffer overflow occurs when a program or process tries to store more data in a buffer (temporary data storage area) than it was intended to hold. Since buffers are created to contain a finite amount of data‚ the extra information - which has to go somewhere - can overflow into adjacent buffers‚ corrupting or overwriting the valid data held in them. Although it may occur accidentally through programming error‚ buffer overflow is an increasingly common type of security attack on data integrity. In buffer
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Part A 1. What is a data structure? Data structure is a mechanism for storing data and organizing it in some way. The data structures you use in Alice are list and arrays. 2. Which automatically grows in size as you add items to it‚ lists or arrays? The list automatically expands as items are added to it. 3. When you drag a list tile and drop it on top of a placeholder in an instruction‚ a menu will appear. What will be on the menu? A menu appears showing a list of the methods that
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1. How can information systems and technologies help to achieve the six strategic business objectives mentioned in the textbook? Illustrate your answer with an example for each objective. Firstly by using information systems and technologies‚ the outcome of successful grade of efficiency and productivity‚ and better information management are able to help on achieving operational excellence. Like before online or phone orders were being placed in a large warehouse which contains uncountable
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5.3.3 Data cleaning Data cleaning helps to remove all unnecessary data. Data cleaning attempts to fill in missing values‚ smooth out noise while identifying outliers and correct inconsistencies in the data. Data cleaning is usually an iterative two-step process consisting of discrepancy detection and data transformation. 5.3.4 Data analysis Data analysis is also known as analysis of data or data analytics‚ is a process of inspecting‚ cleansing‚ transforming and modeling data with the goal of discovering
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| 2010 | | ASSIGNMENTNooriya Zaheer Lecturer: Mrs. Marwa FouadSubmission Date:16 March 2010 | [Relational Database systems (cS274)] | The case study records information about scheduled and planned flights for an airline and the flight reservations made by customers. The key elements in the system revolve around Planned and Actual Flights‚ and the reservations made by customers of actual flights. | Contents Current Business Activities and Operations: 3 List of Business Rules:
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