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exam stats answers

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What is the t distribution? It is the complete set of values computed for every possible random sample for a specific sample size (n) or a specific degree of freedom (df).
What is the trend for the t distribution? As df gets very large, the t distribution gets closer in shape to a normal z-score. As n and df increase, the variability in the t distribution decreases, and it more closely resembles a normal distribution.
What should you do if your df is not in the t table? Look up the critical t for the df values and use the larger t value.
What does standard error indicate? It measures how accurately the sample statistic represents the parameter. 1-sample: measures amount of error expected for a sample mean representing a population mean.
What is the purpose of the chisquare test for goodness of fit? It determines how well the obtained sample proportions fit the populatin proportions specified by the null hypothesis.
What is the purpose of the chi square test for independence? Tests hypothesis bout the corresponding frequency distribution in the population using the frequency distribution for the sample