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Statistics

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Define population   show
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show Some subset of the population intended to represent the population  
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Define sampling unit   show
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Define sampling frame   show
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show Data collected from the entire population  
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Define simple random sample   show
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show -No bias -Easy -Cheap -Equal selection chance  
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Disadvantages of simple random sample   show
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Define systematic sample   show
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Advantages of systematic sample   show
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Disadvantages of systematic sample   show
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Define stratified sample   show
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show -Reflects population structure -Proportional representation within population  
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show -Population clearly classified into strata -Selection within strata suffer from same disadvantages as simple random  
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Define quota sample   show
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Advantages of quota sample   show
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show -Can introduce bias -Population divided into groups -Non responses not recorded  
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Define opportunity sample   show
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show -Easy -Cheap  
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Disadvantages of opportunity sample   show
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show Strata size x sample size/total population  
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show Qualitative- Descriptive Quantitative- Numerical  
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What is the difference between discreet and continuous data   show
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How do we find outliers   show
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show Removing outliers  
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What do we plot for cumulative frequency diagrams   show
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show Frequency density=(Frequency x k)/Class width  
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When do we use a histogram   show
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When do we use a bar chart   show
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What do we comment on when comparing data   show
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What axis is the independent variable on   show
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show Y  
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show There are pairs of values for two variable  
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Define causal relationship   show
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show Estimating a variable within the data range  
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Define extrapolation   show
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What is the purpose of a regression line   show
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show For data within the data range  
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Define mutually exclusive   show
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If events are mutually exclusive: P(A or B)=   show
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show One event has no effect on the other  
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If events are independent P(A and B)=   show
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show A variable whose value depends on the outcome of a random event  
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Define discreet uniform distribution   show
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ΣP(X=x)=   show
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show -Fixed no of trials(n) -2 possible outcomes -Fixed probability of success (P) -Trials are independent of each other  
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show P(X≤Y-1)  
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show 1-P(X≤Y-1)  
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show 1-P(X≤Y)  
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Define test statistic   show
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Define null hypothesis   show
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Define alternate hypothesis   show
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Define critical region   show
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Define critical value   show
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show The probability of incorrectly rejecting the null hypothesis  
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show -Formulate a model for test statistic -Identify suitable null and alternate hypotheses -Calculate the probability of test statistic being observed assuming null hypothesis is true -Compare to significance level -Write conclusion in context of question  
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What must you do for a two tailed hypothesis test   show
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If y+ax^n then logy=   show
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show logk+xlogb  
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What does the PMCC describe   show
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When can the PMCC be used   show
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show H0: p=0 H1: p≠0  
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show P(P|A)  
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What is the rule for independent events and conditional probability   show
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show P(A∪B)  
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show P(B|A)  
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What are the probability symbols for and and or   show
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Created by: Liam P
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