احصاء الملف الاول كامل

Statistics

• science of collecting, organizing, presenting, analyzing, and interpreting numerical data to assist in making more effective decisions.

• Drawing conclusions and/or making decisions concerning a population based only on sample data

• summary measure computed to describe a characteristic of the sample

 Descriptive statistics

• Height of bar or size of pie slice shows the frequency or percentage for each category

• Collecting, presenting, and describing data

• are shown on the horizontal axis

Inferential statistics

• Use sample evidence to test the claim that the population mean weight is 90 pounds

• Estimate the population mean weight using the sample mean weight

• Drawing conclusions and/or making decisions concerning a population based only on sample data

Estimation

• Estimate the population mean weight using the sample mean weight

• are shown on the horizontal axis

• summary measure computed to describe a characteristic of the sample

 Hypothesis Testing

• Estimate the population mean weight using the sample mean weight

• Use sample evidence to test the claim that the population mean weight is 90 pounds

• Height of bar or size of pie slice shows the frequency or percentage for each category

Data Collection Methods

انواعها. كلها صح احفظهم

• Experiments

• Telephone surveys

• Written questionnaires

• Direct observation and personal interview

Population

• the set of all items or individuals of interest

• Estimate the population mean weight using the sample mean weight

• are shown on the horizontal axis

Sample

• Direct observation and personal interview

• a subset of the population

• Data Collection Methods

parameter

• a summary measure computed to describe a characteristic of the sample

• the set of all items or individuals of interest

• a summary measure computed to describe a characteristic of the population

statistic

• a summary measure computed to describe a characteristic of the population

• a summary measure computed to describe a characteristic of the sample

• Direct observation and personal interview