If an economist wishes to determine whether there is evidence that average famil

Question

If an economist wishes to determine whether there is evidence that average family income in a community exceeds $25,000 A. either a one-tailed or two-tailed test could be used with equivalent results. B. a one-tailed test should be utilized. C. a two-tailed test should be utilized. D. None of the above. If the p value is less than alpha in a two-tailed test. A. the null hypothesis should not be rejected. B. the null hypothesis should be rejected. C. a one-tailed test should be used. D. no conclusion should be reached. How many Kleenex should the Clark of tissues contain? Researchers determined that 60 tissues is the average number of tissues used during a cold. Suppose rand sample of 100 Kleenex users yielded the following data on the number of tissues used during a cold: X = 52, s = 22. Using the sample information provided, calculate the value of the test statistic. A. t = 22 (52 - 60)/22 B. (52 - 60)/(22/100) C. t = (52 - 60)/(22/100^2) D. t = (52 - 60)/(22/10) The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. What is the p value associated with the test statistic? A. 0.3577 B. 0.1423 C. 0.0778 D. 0.02 E. None of the above

Explanation / Answer

13)option B : as we arechecking if it exceeds which will ensue a right tailed test

14)option B is correct

15)option D

16) here std error of mean =std deviaiton/(n)1/2 =0.3162

hence test stat t=(X-mean)/std error =(30.45-30)/0.3162 =1.423

for above p value =0.0778

hence option C

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