TARGET JRF 2018 LAST MINUTE REVISION 30 MOST IMPORTANT TOPICS PAPER 1 TARGET 80+
HYPOTHESIS PART 2
Ho True Ho False Correct Rejection Type ll Error Reject Ho Typel Error Fail to Correct Reject Ho Decision
BASIS FOR TYPE I ERROR TYPE II ERROR COMPARISON Type I error refers to non acceptance of hypothesis which ought to be accepted Type II error is the acceptance of hypothesis which ought to be rejected Meaning Equivalent to False positive False negative What is it? It is incorrect rejection of true null hypothesis. A false hit It is incorrect acceptance of false null hypothesis. Represents A miss Probability of committing error Equals the level of significance. Equals the power of test. Indicated by Greek letter a Greek letter 'B"
Directional hypotheses . A directional (1-tailed) hypothesis states the direction of the predicted difference: Participants given pictures will remember significantly more items from a list of 10 than participants given a list of 10 words. One tail We can tell whichway the cat will go
Non-directional hypotheses: 2-tailed hypothesis States there will be a difference, but we don't know what direction that difference will be. Two tails This catcould go in either direction, so we cannot specify
Descriptive Hypotheses . These are propositions that typically state the existence, size, form, or distribution of some variable . Example The current unemployment rate in Detroit exceeds 6 percent of the labor force Researchers will often use a research question rather than a descriptive hypothesis What is the unemployment rate in Detroit?
Relational Hypotheses These are statements that describe a relationship between two variables with respect to some case . Example Foreign cars are perceived by American consumers to be of better quality than domestic cars . Correctional relationships Young machinists are less productive than those who are 35 years or older . Explanatory, or causal relationships An increase in family income leads to an increase in the percentage of income saved
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