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Chapter 10: Q. 60 (page 599)
Find the p-value?
The value of p
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Use the following information to answer the next five exercises. Two metal alloys are being considered as material for ball bearings. The mean melting point of the two alloys is to be compared. 15 pieces of each metal are being tested. Both populations have normal distributions. The following table is the result. It is believed that Alloy Zeta has a different melting point.
What is the p-value?
Use the following information to answer the next five exercises. A researcher is testing the effects of plant food on plant growth. Nine plants have been given the plant food. Another nine plants have not been given the plant food. The heights of the plants are recorded after eight weeks. The populations have normal distributions. The following table is the result. The researcher thinks the food makes the plants grow taller.
At the 1 % significance level, what is your conclusion?
A new prep class was designed to improve SAT test scores. Five students were selected at random. Their scores on two practice exams were recorded, one before the class and one after. The data recorded in the table given below. Are the scores, on average, higher after the class? Test at a level.
Two types of phone operating system are being tested to determine
if there is a difference in the proportions of system failures (crashes). Fifteen out of a random sample of 150 phones with had system failures within the first eight hours of operation. Nine out of another random sample of 150 phones with had system failures within the first eight hours of operation. is believed to be more stable (have fewer crashes) than .
What can you conclude about the two operating systems?
Five ball players think they can throw the same distance with their dominant hand (throwing) and off-hand (catching hand). The data were collected and recorded in the table given below. Conduct a hypothesis test to determine whether the mean difference in distances between the dominant and off-hand is significant. Test at the level.
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