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Formula sheet - Test One.docx

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Administrative Studies
ADMS 2320
Marwan Hassan

Formula Sheet Formula Sheet Formula Sheet – ADMS 2320 – Prof. Yogi Formula Sheet Formula Sheet 1 - Descriptive stats deals with organizing, summarizing, presenting data in a convenient/informative/useful way. - Inferential stats is a body of methods used to draw conclusions or inferences about characteristics of population based on sample data - Population is the group of all items of interest to a statistics practitioner(entire set of observations under study)  descriptive measure is parameter - Sample is a set of data drawn from the studied population(is a subset of a population)  descriptive measure for samp is statistic - Statistical inference is the process of making an estimate, prediction, decision about a population based on sample data - Confidence level is the proportion of times that an estimating procedure will be correct - Significance level measures how frequently the conclusion will be wrong - Descriptive stats includes graphical and tabular statistical methods Interval may be T into ordinal/nominal 2 - Variable is some characteristic of a population/sample Ordinal may be T into nominal - Values of variable are the possible observations of the variable Nominal X - Data are the observed values of a variable - Interval data are real numbers (height/weight/distance) Also called quantitive or numerical - Nominal data are categories (1=married, 2=single) Also called qualitative or categorical - Ordinal data show that the order of the values have meaning (poor fair good v.good) - Two methods for nominal data are graphical/tabular freq.distribution/rel.freq.distribution – bar chart/pie chart - Techniques applied to single set of data is univirate; bivirate.  to compare two nominal data used classification cross / bar chart(2&more) - Number of Classes  1+3.3log(n) n=no of observations 3 - Class width  Range/Classes - Three shapes of histograms 1. Symmetrical 2. Positively Skewed 3. Negatively Skewed - Unimodal has one peak, Bimodal has two peaks. - Bell-shaped histogram - Ogive – cumulative relative frequency on y axis - For interval data use ogive - For time-series data use line chart - Relationship between two variables is measured by scatter diagram - Three relationships 1.Strong linear relat
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