METHODS OF DATA ANALYSIS
DECISION MAKING WITH HYPOTHESIS TESTING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the null hypothesis
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the alternative hypothesis
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a one-tailed test
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a two-tailed test
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Detailed explanation-1: -It is not necessary to specify a direction before testing. A two-tailed test, then, will include the potential of both a positive and a negative effect.
Detailed explanation-2: -A one-tailed test looks for an “increase” or “decrease” in the parameter whereas a two-tailed test looks for a “change” (could be increase or decrease) in the parameter.
Detailed explanation-3: -A two-tailed hypothesis test is designed to show whether the sample mean is significantly greater than and significantly less than the mean of a population. The two-tailed test gets its name from testing the area under both tails (sides) of a normal distribution.
Detailed explanation-4: -The probability of committing a type I error (rejecting the null hypothesis when it is actually true) is called (alpha) the other name for this is the level of statistical significance.