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21 Feb 2018

26. The null and alternative hypotheses are stated in terms of the statistics from the random sample. A) True B) False

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Jarrod Robel
Jarrod RobelLv2
23 Feb 2018
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Related questions

Problem 9 (15 points) Professor Dunderhead teaches statistics every semester exactly the same way. Scores on his final exams are remarkably consistent, with mean score 76.4 and standard deviation 7.3. This semester the professor discovers he has mistakenly been drinking decaffeinated coffee for years and switches to caffeinated coffee. He finds that a random sample of 15 of his students earns an average score of 79.7 on the final. He wonders if this is sufficient evidence to conclude his students this semester performed differently on the final than in years past. (a) Write down appropriate null and alternative hypotheses for this situation

19. The results obtained from a test of significance can always be trusted as long as you use a random sample. A) True B) False

It is known that driving can be difficult in regions where winter conditions involve snow-covered roads. For cars equipped with all-season tires traveling at 90 km/hr, the mean stopping time in fresh snow is known to be 215 meters with a standard deviation of o = 2.5 meters. It is often advocated that automobiles in such areas should be equipped with special tires to compensate for such conditions, especially with respect to stopping distance. A manufacturer of tires made for driving in fresh snow claims that vehicles equipped with their tires have a decreased stopping distance. A study was done using a random sample of 9 snow tires from the manufacturer on a snow-covered test track. The tests resulted in a mean stopping distance of t = 212.9 meters. 30. What are the appropriate null and alternative hypotheses to test the manufacturer's claim? A) Ho:u=215 against H.: 4 > 215 B) Ho:u=215 against H:7215 C) Ho: u=215 against H: 4 <215 D) H: X = 215 against H: X <215 E) Snow tires decrease the stopping distance in loose snow.

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