The scores of students on the SAT college entrance examinations at a certain high school had...
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The scores of students on the SAT college entrance examinationsat a certain high school had a normal distribution with mean?=548.8?=548.8 and standard deviation ?=26.4?=26.4.
(a) What is the probability that a single student randomlychosen from all those taking the test scores 555 or higher?
ANSWER:
For parts (b) through (d), consider a simple random sample (SRS) of35 students who took the test.
(b) What are the mean and standard deviation of the sample meanscore x¯x¯, of 35 students?
The mean of the sampling distribution for x¯ is:
The standard deviation of the sampling distribution for x¯ is:
(c) What z-score corresponds to the mean score x¯ of 555?
ANSWER:
(d) What is the probability that the mean score x¯ of thesestudents is 555 or higher?
ANSWER:
The scores of students on the SAT college entrance examinationsat a certain high school had a normal distribution with mean?=548.8?=548.8 and standard deviation ?=26.4?=26.4.
(a) What is the probability that a single student randomlychosen from all those taking the test scores 555 or higher?
ANSWER:
For parts (b) through (d), consider a simple random sample (SRS) of35 students who took the test.
(b) What are the mean and standard deviation of the sample meanscore x¯x¯, of 35 students?
The mean of the sampling distribution for x¯ is:
The standard deviation of the sampling distribution for x¯ is:
(c) What z-score corresponds to the mean score x¯ of 555?
ANSWER:
(d) What is the probability that the mean score x¯ of thesestudents is 555 or higher?
ANSWER:
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