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.78 You belong to a class of 15 students. The teacher hands 15 graded assignments back...
A professor asks n students to peer grade their test papers. He hands out one of...
A professor asks n students to peer grade their test papers. He hands out one of the n papers to each student uniformly at random. Show that with probability at least at 1−1/k, not more than k students get their own test paper. Hint: Consider the random variable Xi that denotes whether student i gets his/her own paper. Use Markov’s inequality.
A teacher believes that whatever he says in class has no effect on his students. Just...
A teacher believes that whatever he says in class has no effect on his students. Just as he's about to quit his profession, a statistician enters the room and suggests that the teacher design a study to test his assumption. The study will look at whether providing in-class feedback on homework assignments enhances classroom performance. The teacher wants to know whether providing feedback before or after returning the assignments is most useful. He's also interested in the most effective means...
52. In a class of 12 boys and 9 girls, the teacher selects three students at...
52. In a class of 12 boys and 9 girls, the teacher selects three students at random to write problems on the board. What is the probability that all the students selected are boys? (Round your answer to four decimal places.)
2.53 Suppose that 15 employees are to be divided among 4 job assignments, with 3 going...
2.53 Suppose that 15 employees are to be divided among 4 job assignments, with 3 going to job I, 4 going to job II, 6 going to job III, and 2 going to job IV. Suppose that job I is the least favorite among all employees and that three employees of a certain ethnic group all get assigned to job I. Assuming that they are the only employees among the 15 under consideration who belong to this ethnic group, what...
QUESTION 3 A teacher sees students straggling into her class at highly diverse times. She secretly...
QUESTION 3 A teacher sees students straggling into her class at highly diverse times. She secretly records when each person comes into her class. Everyone in the class at the bell gets a score of zero. Then, as each late person comes in, the number of seconds after the bell that the person arrives is recorded. Number of seconds late, then, is each person's individual score. The scores ranged from 0 to 600 (for people who were 10 minutes late)....
A small college has an entering freshmen class of 600 students. Of these, 240 have brought...
A small college has an entering freshmen class of 600 students. Of these, 240 have brought their own personal computers to campus. A random sample of 110 entering freshmen was taken. What is the probability that the sample proportion of freshman students who brought their own personal computers to campus is between .42 and .46?
4) 80 students enter a Ping-Pong tournament. Sex and class in school classify them. The results...
4) 80 students enter a Ping-Pong tournament. Sex and class in school classify them. The results are in the table. whiz at Seniors Juniors Males 15 17 2. 10 25 4% Females 23 a) If a person is selected at random, what is the probability that the person is a junior or female? If a person is selected at random, what is the probability that the person is a male given that. he is a senior? If a person is...
Computing Z scores A teacher wanted to know how well the gifted students in here class...
Computing Z scores A teacher wanted to know how well the gifted students in here class perform relative to her other classes. She administers a standardized test with a mean of 50 and standard deviation of 10. Her class of 31 students has an average score of 55, what percent of classes is their average score higher than? 2. A researcher wanted to study the effects of mentoring on intelligence scores. He wanted to know as a baseline what the...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with a standard deviation 12 students, and with a normal distribution. Six of these students are international students What is the probability that, if one student is picked at a random, he/she be a teenager (12 to 19 years old)? You need to (somewhat) critically think about this before tackling it!! 1. What is the probability that if ONE student is selected at random, he/she...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with a standard deviation 12 students, and with a narmal distribution. Six of these students are international students. What is the probability that, if one student is picked at a random, he/she be a teenager (12 to 19 years old)? You need to (somewhat) critically think about this before tackling it!! 1. 2. What is the probability that if ONE student is selected at random,...
2.53 Suppose that 15 employees are to be divided among 4 job assignments, with 3 going to job I, 4 going to job II, 6 going to job III, and 2 going to job IV. Suppose that job I is the least favorite among all employees and that three employees of a certain ethnic group all get assigned to job I. Assuming that they are the only employees among the 15 under consideration who belong to this ethnic group, what...
QUESTION 3 A teacher sees students straggling into her class at highly diverse times. She secretly records when each person comes into her class. Everyone in the class at the bell gets a score of zero. Then, as each late person comes in, the number of seconds after the bell that the person arrives is recorded. Number of seconds late, then, is each person's individual score. The scores ranged from 0 to 600 (for people who were 10 minutes late)....
4) 80 students enter a Ping-Pong tournament. Sex and class in school classify them. The results are in the table. whiz at Seniors Juniors Males 15 17 2. 10 25 4% Females 23 a) If a person is selected at random, what is the probability that the person is a junior or female? If a person is selected at random, what is the probability that the person is a male given that. he is a senior? If a person is...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with a standard deviation 12 students, and with a normal distribution. Six of these students are international students What is the probability that, if one student is picked at a random, he/she be a teenager (12 to 19 years old)? You need to (somewhat) critically think about this before tackling it!! 1. What is the probability that if ONE student is selected at random, he/she...
In a university class that includes 120 students, mostly non-traditional, the Mean age is 32, with a standard deviation 12 students, and with a narmal distribution. Six of these students are international students. What is the probability that, if one student is picked at a random, he/she be a teenager (12 to 19 years old)? You need to (somewhat) critically think about this before tackling it!! 1. 2. What is the probability that if ONE student is selected at random,...
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