Parameter A numerical value summarizing all the data of an entire population

# Parameter a numerical value summarizing all the data

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Parameter : A numerical value summarizing all the data of an entire population. Statistic : A numerical value summarizing the sample data. Ms. Lubna Ineirat
Identifying Parameters and Statistics 1) A researcher wants to estimate the average height of women aged 20 years or older. From a simple random sample of 45 women, the researcher obtains a sample mean height of 63.9 inches. The parameter is the average height of all women aged 20 years or older. The statistic is the average height of 63.9 inches from the sample of 45 women. ------------------------------------------------------------------------- 2) A nutritionist wants to estimate the mean amount of sodium consumed by children under the age of 10. From a random sample of 75 children under the age of 10, the nutritionist obtains a sample mean of 2993 milligrams of sodium consumed. The parameter is the mean amount of sodium consumed by children under the age of ten. The statistic is the mean of 2993 milligrams of sodium obtained from the sample of 75 children. Ms. Lubna Ineirat
Example : A college dean is interested in learning about the average age of faculty. Identify the basic terms in this situation. The population is the age of all faculty members at the college. A sample is any subset of that population. For example, we might select 10 faculty members and determine their age. The variable is the “age” of each faculty member. The parameter of interest is the “average” age of all faculty at the college. The statistic is the “average” age for all faculty in the sample. Ms. Lubna Ineirat
Example: A study about smoking at the AAUJ. A random sample of 350studens at AAUJ was taken such that every 10 th student from the population was asked the following two questions: a. Do you smoke: yes no b. How much did you spend in shekels on smoking last week ? Answer the following questions 1. What is the population in the study? 2. What is the sampling method? 3. list all the variables in the study, indicate whether the variable is qualitative or quantitative ? If quantitative, indicate whether it is continuous or discrete? If qualitative, indicate whether it is nominal or ordinal? Ms. Lubna Ineirat

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• Fall '19
• Ms. Lubna Ineirat

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