Bluman A.G. Elementary Statistics- A Step By Step Approach

Instructor’s Section Answers3. Sum of minus ranks is 6; sum of plus ranks is 15.The test value is 6.4. C.V. 59; do not reject5. C.V. 20; reject6. C.V. 52; do not reject7. C.V. 102; reject8. C.V. 28; do not reject9. H 0 : the human dose is equal to the animal dose andH 1 : the human dose is more than the animal dose (claim);C.V. 6; w s 2; reject. There is enough evidence tosupport the claim that the human dose costs more than theequivalent animal dose. One reason is that some peoplemight not be inclined to pay a lot of money for their pets’medication.10. H 0 : there is no difference in the assessed values of theproperties for the given two years and H 1 : there is adifference in the assessed values of the properties for thegiven two years (claim); C.V. 11; w s 15; do not reject.There is not enough evidence to support the claim that theassessed value of the properties has changed. The assessedproperty values would probably not be normally distributed.11. H 0 : there is no difference in the weights of the subjectsand H 1 : there is a difference in the weights of thesubjects (claim); C.V. 4; w s 5; do not reject. Thereis insufficient evidence to support the claim that theweights have changed.12. H 0 : there is no difference in legal costs and H 1 : there is adifference in legal costs; w s 2.5; C.V. 4; reject. Thereis sufficient evidence to conclude a difference in legal costs.13. H 0 : the prices of prescription drugs in the United Statesare equal to the prices in Canada and H 1 : the drugs sold inCanada are cheaper; C.V. 11; w s 3; reject. There isenough evidence to support the claim that the drugs areless expensive in Canada.Exercises 13–51. H 0 : there is no difference in the number of calories andH 1 : there is a difference in the number of calories(claim); C.V. 7.815; H 2.842; do not reject. Thereis not enough evidence to support the claim that thereis a difference in the number of calories.2. H 0 : there is no difference in the mathematical literacyscores of the individuals and H 1 : there is a difference inthe mathematical literacy of the individuals (claim);C.V. 5.991; H 4.16; do not reject. There is notenough evidence to support the claim that there is adifference in the mathematical literacy scores of theindividuals.3. H 0 : there is no difference in the prices of the three typesof lawnmowers and H 1 : there is a difference in the pricesof the three types of lawnmowers (claim); C.V. 4.605;H 1.07; do not reject. There is not enough evidence tosupport the claim that the prices are different. No, priceis not a factor. Results are suspect since one sample isless than 5.4. H 0 : there is no difference in the amounts of sodium inthe different brands of microwave dinners and H 1 : thereis a difference in the amounts of sodium in the differentbrands of microwave dinners (claim); C.V. 5.991;H 10.533; reject. There is enough evidence to supportthe claim that there is a difference in the amounts ofsodium in the different brands of microwave dinner.5. H 0 : there is no difference in the amounts of the benefitsfor the areas and H 1 : there is a difference in the amountof the benefits for the areas (claim); C.V. 5.991;H 12.43; reject. There is significant evidence to supportthe claim that there is a difference in the amount of thebenefits for the areas. The benefits are probably notnormally distributed.6. H 0 : there is no difference in the number of job offersreceived by each group and H 1 : there is a difference inthe number of job offers received by each group (claim);C.V. 5.991; H 8.54; reject. There is enough evidence tosupport the claim that the number of job offers is different.7. H 0 : there is no difference in spending between regions andH 1 : there is a difference in spending between regions;H 0.74; C.V. 5.991; do not reject. There isinsufficient evidence to conclude a difference in spending.8. H 0 : there is no difference in the prices of the three typesof printer and H 1 : there is a difference in the prices of thethree types of printer (claim); C.V. 5.991; H 0.809;do not reject. There is not enough evidence to support theclaim that there is a difference in the prices of the printers.No, based on these samples, you cannot conclude that onetype of printer generally costs more than another type.9. H 0 : there is no difference in the number of crimes in thefive precincts and H 1 : there is a difference in the numberof crimes in the five precincts (claim); C.V. 13.277;H 20.753; reject. There is enough evidence to supportthe claim that there is a difference in the number ofcrimes in the five precincts.10. H 0 : there is no difference in caffeine content and H 1 :there is a difference in caffeine content; H 9.98;C.V. 5.991; reject. There is sufficient evidence toconclude a difference in caffeine content.11. H 0 : there is no difference in speeds and H 1 : there is adifference in speeds; H 3.815; C.V. 5.991; do notreject. There is insufficient evidence to conclude adifference in speeds.Exercises 13–61. 0.716 2. 0.4883. 0.648 4. 0.8335. r s 0.929; H 0 : r 0 and H 1 : r 0; C.V. 0.786;reject. There is enough evidence to say that there is arelationship between the grade 4 achievement tests andthe grade 8 achievement tests.IS–70