The null hypothesis _____. a) concerns a population b) is denoted by the symbol

Question

The null hypothesis _____. a) concerns a population b) is denoted by the symbol H_0 c) generally states that there is no effect, no change, or no difference d) All of the other choices are correct. In general, changing the alpha level from .01 to .05 will _____. a) increase the likelihood of rejecting the null hypothesis b) decrease the likelihood of rejecting the null hypothesis c) increase chance of a Type I error d) a and c. In a hypothesis test, a z-score value near zero _____. a) is probably in the critical region b) means that you should probably reject the null hypothesis c) is strong evidence of a statistically significant effect d) None of the other options are correct. A sample of n = 25 individuals is selected from a population with mu = 80 and a treatment is administered to the sample. If the treatment has a large effect, then _____. a) the sample mean should be very different from 80 and should lead you to reject the null hypothesis b) the sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis c) the sample mean should be close to 80 and should lead you to reject the null hypothesis d) the sample mean should be close 80 and should lead you to fail to reject the null hypothesis A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hypothesis test, and the test produces z = -1.85. Based on this result, what is the correct statistical decision? a) The researcher should reject the null hypothesis with alpha = .05 but not with alpha = .01. b) The researcher should reject the null hypothesis with either alpha = .05 or alpha = .01. c) The researcher should fail to reject H_0 with either alpha = .05 or alpha = .01. d) cannot answer without additional information

Explanation / Answer

2. In a statistical test the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.

So answer is c

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