16. From experience, a professor knows that the test score of students taking a final examination...
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?
Suppose that based on past experience a professor knows that the test score of a stadent taking his final examination is a random variable with mean 6b and standard deviation 10. How many students would have to take the examination to ensure, with probability at least 0,94, that the class average would be within 3 of 667 answer Round UP your answer to the nearest integer
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 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...
1. A mathematics professor believes that the performance of students taking an elementary calculus course has declined in recent years. The professor decides to reuse a final exam that was first administered 10 years ago. At that time the mean score was 81 with s=10, for the 50 students in the section taught by that professor When given to the current class of 53 students, who observed essentially the same set of lectures, the mean is 75 with s=15. If...
a professor grades students on three tests, four quizzes, and a final examination. each test counts as two quizzes and the final examination counts as two tests. sara has test scores of 64,84,75. saras quiz scores are 94,87,93,92, her final examination score is 64. use the weighted mean formula to find saras average for the course. round your answer to one decimal place
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 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...
The average final exam score for the statistics course is 75%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is lower. The final exam scores for the 15 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 63, 81, 82, 65, 75, 49. 86, 75, 56, 62, 72, 83, 81, 66, 48...