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Suppose that based on past experience a professor knows that the test score of a stadent taking his final examinati...
From past experience, a professor knows that the test score of a student taking his final...
From past experience, a professor knows that the test score of a student taking his final examination is a random variable with mean 67.8 and standard deviation of 6.5. (a.) How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 2.5 of 67.8?
16. From experience, a professor knows that the test score of students taking a final examination...
16. From experience, a professor knows that the test score of students taking a final examination is a random variable with mean 65. A. Give an upper bound on the probability that a student's test score will exceed 75 B. Suppose in addition the professor knows that the variance of a student's test score is equal to 30. What can be said about the probability that a student will score between 55 and 75? C. How many students would have...
PROBLEMS INSTRUCTIONS #3 _ 4 points Suppose that from the past experience a professor knows that...
PROBLEMS INSTRUCTIONS #3 _ 4 points Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 75 and standard deviation 8. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 2.5 of 75? Hints: Your answer is a number of people so consider if you should be using decimal values....
A professor gives his class a final examination that he knows from years of experience yields...
A professor gives his class a final examination that he knows from years of experience yields a population mean of 84. His present class of 24 obtains a mean of 88 and a standard deviation of 8. Is he correct in assuming that the performance of the most recent class differs significantly from that of other classes? Use a one-tailed test here since the professor assumes that the class will score higher. Null hypothesis: Alternative hypothesis: Statistical test: Significance level...
Based on past experience, a professor who teaches large lecture classes believes that 8 % of...
Based on past experience, a professor who teaches large lecture classes believes that 8 % of the people who attend their class do not arrive after class begins. Recently, this professor took a sample of 200 students. What assumptions must be true to be able to approximate the sampling distribution with a normal model? Assumptions: What are the mean and standard deviation of this model (accurate to 3 decimal places)? mean = standard deviation (accurate to 3 decimal places) =...
Scores on Professor Combs Statistics Final Exams have a long term history of being normally distributed with a mean of μ=70 and a standard deviation of σ=8
Scores on Professor Combs Statistics Final Exams have a long term history of being normally distributed with a mean of μ=70 and a standard deviation of σ=8 a.) Find the probability that a single student will score above a 75 on the Final exam. b.) Find the probability that a single student will score between a 65 and 75 on the Final exam. c.) Find the probability that an entire class of 20 students will have a class average above a 75 on...
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 7. Complete parts (a) through (d). a. What is the probability that a student scored below 86 on this exam? (Round to four decimal places as needed.) b. What is the probability that a student scored between 66 and 93? (Round to four decimal places as needed.) c. The probability is 55% that a student taking...
Scores for a common standardized college aptitude test are normally distributed with a mean of 480...
Scores for a common standardized college aptitude test are normally distributed with a mean of 480 and a standard deviation of 106. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 553.4. P(X > 553.4) = Enter your answer as a number accurate to 4 decimal places....
Scores for a common standardized college aptitude test are normally distributed with a mean of 515...
Scores for a common standardized college aptitude test are normally distributed with a mean of 515 and a standard deviation of 108. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 554. P(X > 554) = Enter your answer as a number accurate to 4 decimal places....
16. From experience, a professor knows that the test score of students taking a final examination is a random variable with mean 65. A. Give an upper bound on the probability that a student's test score will exceed 75 B. Suppose in addition the professor knows that the variance of a student's test score is equal to 30. What can be said about the probability that a student will score between 55 and 75? C. How many students would have...
PROBLEMS INSTRUCTIONS #3 _ 4 points Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 75 and standard deviation 8. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 2.5 of 75? Hints: Your answer is a number of people so consider if you should be using decimal values....
Based on past experience, a professor who teaches large lecture classes believes that 8 % of the people who attend their class do not arrive after class begins. Recently, this professor took a sample of 200 students. What assumptions must be true to be able to approximate the sampling distribution with a normal model? Assumptions: What are the mean and standard deviation of this model (accurate to 3 decimal places)? mean = standard deviation (accurate to 3 decimal places) =...
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