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A math teacher claims that the average final exam scores for the seventh grade boys and girls are equal. The average score for 10 randomly selected boys is 87 with a standard deviation of 11. The average score for 10 randomly selected girls is 89 with a standard deviation of 12. State the null and alternate hypotheses. At a sig. of .05 can you reject the teacher's claim? Assume normal distribution and equal variances. What is your analysis?
students. of these 28 are juniors , 34 are physics majors, and 9 are neither. a student is selected at random, what is the probability the student is both a junior and a physics major?
a teacher has determined that the amount of time a student spends working on homework during seminar is a normal random
q1in the second order differential equation we described the motion of the pendulum. unfortunately the differential
A force of 5 Newtons acts in the direction of a = -7i+3j+4k, moving a particle from point B(1, 7, 1) to point C(-7, 5,-2). What is the work done on the particle given that the displacement is measured in meters?
A person hired a firm to build a CB radio tower.The firm charges $100 for labor for the first 10 feet. After that, the cost of the labor for each succeeding 10 feet is $25 more than the preceding 10 feet. That is, the next 10 feet will cost $125, ..
Using standard partition Pn (0,1) where n greater or equal to 4 and deduce that f is intergrable on (0,1) and evaluate (intergral sign with 1 at top and 0 at bottom) of f
A bank loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 40. If 36 different applicants are randomly selected, calculate the probability that their mean above 208.
The number of workers in the U. S. increased from 41.3 million to 44.4 million. What is the percent increase? Employees working from home increased from 23.5 million to 24.1 million. What is the percent increase.
A large box-shaped arena has a rectangular floor that measures 200 feet by 150 feet, and a flat ceiling that is 35 feet above the floor. Find the area of the floor and the volume of the arena.
John is intending to put $10,000 into investment. He picked a fund that grows at 5% per annum. Assuming his profit is compounded annually, how much money would he have from this investment after 5 years and how long would it take for his money to ..
The gestation time for human babies is assumed to be normally distributed with a mean of 278 days and a standard deviation of 12 days. What happens to the standard deviation of the sampling distribution of the sample mean as n increases?
angle of elevation to the top of the tree to be 53°. What is the height of the tree? Round your answer to the nearest foot.
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