The probability that the average time for the 800-meter run for middle distance
ID: 3219300 • Letter: T
Question
The probability that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds shorter after the training is 0.9.
We know that 90% of the middle distance runners shortened their times between 2.7 and 4.2 seconds after the training.
c. Based on this sample, we are 90% confident that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds shorter after the new training.
d. We are 90% confident that a randomly selected middle distance runner at this high school will have a time for the 800-meter run that is between 2.7 and 4.2 seconds shorter after the training than before the training.
e. Based on this sample, we are 90% confident that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds longer after the new training.
a.The probability that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds shorter after the training is 0.9.
b.We know that 90% of the middle distance runners shortened their times between 2.7 and 4.2 seconds after the training.
c. Based on this sample, we are 90% confident that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds shorter after the new training.
d. We are 90% confident that a randomly selected middle distance runner at this high school will have a time for the 800-meter run that is between 2.7 and 4.2 seconds shorter after the training than before the training.
e. Based on this sample, we are 90% confident that the average time for the 800-meter run for middle distance runners at this high school is between 2.7 and 4.2 seconds longer after the new training.
Explanation / Answer
answer is
c. Based on this sample, we are 90% confident that the average time for the
800-meter run for middle distance runners at this high school is between
2.7 and 4.2 seconds shorter after the new training.
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