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1. (1 point) The ages of students in an evening class is normally distributed with mean...
Lets say that ages in this class are distributed normally with a mean of 19 and...
Lets say that ages in this class are distributed normally with a mean of 19 and a standard deviation of 2, what does this mean? Using this data what is the likelihood that any randomly selected group of five students has an average age of 20 or older. With the same data lets now assume that the class is a random sample of all University level classes and that there are 50 people in the class. What is the 95%...
Suppose that the ages of PSU (undergraduate) students is independently and normally distributed witha mean of...
Suppose that the ages of PSU (undergraduate) students is independently and normally distributed witha mean of 19 and a standard deviation of 2. Suppose a first sample of four PSU students and a second sample of four PSU students are selected at random 1. What is the distribution of the sample mean, X, of the first four students? 2. What is the distribution of the sample mean, Y, of the other four students? 3. What is the distribution of 2X-Y?...
Suppose that the ages of undergraduate students at MIT is independently and normally distributed with a...
Suppose that the ages of undergraduate students at MIT is
independently and normally distributed with a
mean of 19 and a standard deviation of 2. Suppose a first sample of
four MIT students and a second sample
of four MIT students are selected at random.
1. What is the distribution of the sample mean, X, of the first four students? 2. What is the distribution of the sample mean, Y, of the other four students? 3. What is the distribution...
1) The grades of students in a class are distributed normally. The average grade of the...
1) The grades of students in a class are distributed normally. The average grade of the students in this class is 65; standard deviation is 2. The students who take the teacher give more points by making "systematic error". What is the passing score since it gives more than 25% of the class score in total? Calculate.
Part A. Score on 25 point test is normally distributed with mean 22 and standard deviation...
Part A. Score on 25 point test is normally distributed with mean 22 and standard deviation 5. You took a sample of 9 students. The mean for this group is 19.111111 Test the hypothesis that the performance of this group is different than the regular group. Use α=.05. What is the alternative hypothesis? What is the rejection region? Calculated z What is your decision? Yes or no? You believe that the group from an honors and would perform better than...
Problem 8. (1 point) Suppose the scores of students on a Statistics course are Normally distributed with a mean of...
Problem 8. (1 point) Suppose the scores of students on a Statistics course are Normally distributed with a mean of 261 and a standard deviation of 66 What percentage of the students scored between 261 and 391 on the exam? (Give your answer to 3 significant figures) I percent.
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a...
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.2 years. What percentage of individual aircraft have ages greater than 15 years? Assume that a random sample of 49 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages greater than 15 years?
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a...
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 6.9436 years. What percentage of individual aircraft have ages between 9 years and 15 years? Assume that a random sample of 64 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 9 years and 15 years?
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a...
The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 8.1455 years. What percentage of individual aircraft have ages between 11 years and 17 years? Assume that a random sample of 81 aircraft is selected and the mean age of the sample is computed. What percentage of sample means have ages between 11 years and 17 years?
The IQ scores of college students are normally distributed with the mean of 120 and standard...
The IQ scores of college students are normally distributed with the mean of 120 and standard deviation of 10. If a random sample of 25 students is taken, what is the probability that the mean of this sample will be between 120 and 125. (49.38%)
Suppose that the ages of PSU (undergraduate) students is independently and normally distributed witha mean of 19 and a standard deviation of 2. Suppose a first sample of four PSU students and a second sample of four PSU students are selected at random 1. What is the distribution of the sample mean, X, of the first four students? 2. What is the distribution of the sample mean, Y, of the other four students? 3. What is the distribution of 2X-Y?...
Suppose that the ages of undergraduate students at MIT is
independently and normally distributed with a
mean of 19 and a standard deviation of 2. Suppose a first sample of
four MIT students and a second sample
of four MIT students are selected at random.
1. What is the distribution of the sample mean, X, of the first four students? 2. What is the distribution of the sample mean, Y, of the other four students? 3. What is the distribution...
Problem 8. (1 point) Suppose the scores of students on a Statistics course are Normally distributed with a mean of 261 and a standard deviation of 66 What percentage of the students scored between 261 and 391 on the exam? (Give your answer to 3 significant figures) I percent.
The IQ scores of college students are normally distributed with the mean of 120 and standard deviation of 10. If a random sample of 25 students is taken, what is the probability that the mean of this sample will be between 120 and 125. (49.38%)
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