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الكلية كلية العلوم للبنات
القسم قسم علوم الحياة
المرحلة 1
أستاذ المادة سماح عبد الهادي عباس الهاشمي
5/30/2011 10:03:12 AM
Introduction:
Decision makers make better decisions when they use all available information in an effective and meaningful way. The primary role of statistics is to to provide decision makers with methods for obtaining and analyzing information to help make these decisions. Statistics is used to answer long-range planning questions, such as when and where to locate facilities to handle future sales.
Definition:
Statistics is defined as the science of collecting, organizing, presenting, analyzing and interpreting numerical data for the purpose of assisting in making a more effective decision.
Types of Statistics:
There are two types of statistics
1. Descriptive Statistics is concerned with summary calculations, graphs, charts and tables.
2. Inferential Statistics is a method used to generalize from a sample to a population. For example, the average income of all families (the population) in the US can be estimated from figures obtained from a few hundred (the sample) families.
Statistical Population:
Is the collection of all possible observations of a specified characteristic of interest. An example is all of the students in BUSA 3101 course in this term. Note that a sample is a subset of the population.
Variable:
A variable is an item of interest that can take on many different numerical values.
Types of Variables or Data:
1. Qualitative Variables are nonnumeric variables and can t be measured. Examples include gender, religious affiliation, state of birth.
2. Quantitative Variables are numerical variables and can be measured. Examples include balance in your checking account, number of children in your family. Note that quantitative variables are either discrete (which can assume only certain values, and there are usually "gaps" between the values, such as the number of bedrooms in your house) or continuous (which can assume any value within a specific range, such as the air pressure in a tire.)
Types of Quantitative Data:
There are four (4) types of quantitative data:
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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