Thirty randomly selected students took the calculus final. If the sample mean score was 79 and the standard deviation was 7 , find the 99% confidence interval for the mean score of all students. Assume the population is normally distributed and round to two decimal places.
In: Statistics and Probability
Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.612.61 and a standard deviation of 0.390.39. Using the empirical rule, what percentage of the students have grade point averages that are between 1.831.83 and 3.393.39?
In: Statistics and Probability
The scores on a math test are normally distributed with a mean of 74 and a standard deviation of 8. The test scores range from 0 to 100. Seven students had test scores between 82 and 98. Estimate the number of students who took the test.
In: Statistics and Probability
In a certain Algebra 2 class of 20 students, 12 of them play basketball and 13 of them play baseball. There are 3 students who play neither sport. What is the probability that a student chosen randomly from the class plays basketball or baseball?
In: Statistics and Probability
A random sample of 20 students at a university showed an average age of 21.4 years and a sample standard deviation of 2.6 years. The 98% confidence interval for the true average age of all students in the university is?
Enter in the upper limit of your confidence interval
In: Statistics and Probability
In: Advanced Math
The average age of students at INTI International University is known to be 22.5 years old. Assume the population is normally distributed with a standard deviation of 5 years. Find the probability that the mean age of a sample of 64 students is between 20.9 and 23.8 years old.
In: Statistics and Probability
Suppose we are interested in the proportion of nursing majors at a university, and we take a random sample of 150 students to estimate the percent of students in our class who are nursing majors.
In: Statistics and Probability
Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.52 and a standard deviation of 0.43. Using the empirical rule, what percentage of the students have grade point averages that are between 1.23 and 3.81?
In: Statistics and Probability
Suppose you have 24 items (three red, three blue, three yellow, and three green) to give to 24 students. How many different ways can you distribute the things to the students? (Note: the items of the same color are identical)
In: Computer Science