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A group of 50 New York psychology students got a mean score of 530 on the psychology GRE with a standard deviation of 80. These students claim to be WAY more nerdy than a group of 50 California psychology students who had a mean score of 515 with a standard deviation of 50. Are the New York students truly more nerdy than the California students?
General
2 months ago
AP Stats The College Board reported that 57.9% of all students who took the 2013 AP Statistics exam earned scores of 3 or higher. One teacher wondered if the perfor- mance of her school was better. She believed that year’s students to be typical of those who will take AP Stats at that school and was pleased when 34 of her 54 students achieved scores of 3 or better. Can she claim that her school is better?
General
2 months ago
A randomly selected customer support wait time (from a normal distribution) is calculated to be 1.8 standard deviations above its mean. What is the probability that another randomly selected customer wait time from the distribution will be less than 1.8 standard deviations from the mean? Round to four decimal places as needed.
General
2 months ago
A record book has 3 confidence intervals listed (2,3) (1,2), and (1.5, 3.) for the samwe parameter. The scientist was told one of them was record from a faulty instrument, the 2nd a 95% confidence interval and the 3rd a 99% confidence interval. But they don't know which is which. Which of the following is true?O (1,2) is 99% CI, (2,3) is 95% CI, (1.5, 3.5) is the errorO (2,3) is 99% CI, (1.5,3.5) is 95% CI, (1,2) is the errorO (2,3) is 95% CI, (2,3) is 95% CI, (1,2) is the errorO (1,2) is 95% CI, (2,3) is 99% CI, (1.5, 3.5) is the error
General
2 months ago
A random sample of 64 second-graders in a certain school district are given a standardized mathematics skills test. The sample mean score is 51.48 . Assume the standard deviation for the population of test scores is 15. The nationwide average score on this test is 50. The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average. Perform the hypothesis test and compute the P-value?
General
2 months ago
HELP ???? Which is the correct statement ?
General
2 months ago
What is the remainder when (3x^3-2x^2+4x-3) is divided by (x^2+3x+3)?
General
2 months ago
Bonnie has a container in the shape of a rectangular pyramid. The formula for the surface area of the enclosed space is S = lw + 0.5Ph. Solve for P.P = S – lw – 0.5hP = S + lw + 0.5hP = The quantity S minus l times w all divided by 0.5 times hP = S divided by the quantity l times w plus 0.5 times h
General
2 months ago
Jaxon and Isaac live different directions from the city center. Jaxon lives 10 blocks east and 5 blocks north. Isaac lives 8 blocks west and 15 blocks south. a. The city center is the origin. What would the coordinates be for Jaxon and Isaac
General
2 months ago
A country's census lists the population of the country as 247 million in 1990, 269 million in 2000, and 287 million in 2010. Fit a second-degree polynomial passing through these three points. (Let the year 2000 be x = 0 and let p(x) represent the population in millions.)
General
2 months ago
Underline all the ordered pairs (x,y) that are solutions to the equation y=2x+1.(3,7) (7,3) (−1,14) (0,1) (12,25)(5,11) (0,12) (1,8) (12,0) (−1,−1)
General
2 months ago
Let A= ????1 3 23 1 24 3 2???? and B = ????2 1 32 2 11 3 1???? represent the bus routes of two companies between three cities.a. Let C = A+ B. Find matrix C. Explain what the resulting matrix and entry c1,3 mean in this context.b. Let D = B + A. Find matrix D. Explain what the resulting matrix and entry ????????1,3 mean in this context.c. What is the relationship between matrices C and D? Why do you think that is?
General
2 months ago
Sketch the lines given by x+y =6 and −3x+y = 2 on the same set of axes to solve the system graphically.Then solve the system of equations algebraically to verify your graphical solution.
General
2 months ago
An airplane makes a 400-mile trip against a head wind in 4 hours. The return trip takes 2.5 hours, the wind now being a tall wind. If the plane maintains a constant speed with respect to still air, and the speed of the wind is also constant and does not vary, find the still-air speed of the plane and the speed of the wind.
General
2 months ago
Is matrix multiplication comutative?
General
2 months ago
Graph the line given by 2x+y=1 and the circle given by x²+y²=10.Find all solutions to the system of equations. Verify your result both algebraically and graphically.
General
2 months ago
Graph the line given by 5x+6y=12 and the circle given by x²+y²=1.Find all solutions to the system of equations.
General
2 months ago
By solving the equations as a system, find the points common to the line with equation x-y=6 and the circle with equation x²+y²=26.Graph the line and the circle to show those points.
General
2 months ago
Jackson can remove the shingles off of a house in 7 hours, while Martin can remove the shingles in 5 hours. How long will it take them to remove the shingles if they work together?
General
2 months ago
dividing whole numbers
General
2 months ago
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