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4) A researcher is testing a hypothesis of a single mean. The critical z value for...

4) A researcher is testing a hypothesis of a single mean. The critical z value for α = .05 and a two tailed test is ±1.96. The observed z value from sample data is minus2.11. The decision made by the researcher based on this information is to _____ the null hypothesis.

reject

fail to reject

redefine

change the alternate hypothesis into

restate

5)

A researcher is testing a hypothesis of a single mean. The critical z value for α = .05 and a two tailed test is ±1.96. The observed z value from sample data is 2.85. The decision made by the researcher based on this information is to _____ the null hypothesis.

reject

fail to reject

redefine

change the alternate hypothesis into

restate

6)

Suppose that

H subscript o : mu less or equal than 0.01

H subscript alpha : mu greater than 0.01

The value 0.01 is the maximum safe level of some naturally occurring lethal pollutant in drinking water for human consumption. You need to decide if you will use water coming from a specific source for one of the beverages your company produces, based on sample measures of this pollutant taken in random different locations and times at the source of water. In this case you would want to _____.

maximize the power of the test

maximize beta

minimize mu

maximize the significance, alpha

maximize 1 minus alpha
math   Statistics-And-Probability   
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