"find the score that 75% of students will exceed. consider NAEP scores, which are approximately Normal, N(288,38). Seventy-five percent of the students will score above x on this exam. Find x.
"find the score that 75% of students will exceed. consider NAEP scores, which are approximately Normal,...
Many states assess the skills of their students in various grades. One program that is available for this purpose is the National Assessment of Educational Progress (NAEP). We assumed that the NAEP U.S. mathematics scores for twelfth-grade students are approximately Normal with the reported mean and standard deviation, N(157 , 30 ). For the twelfth-grade U.S. history scores, the following percentiles are reported: Percentile Score 10% 120 25% 136 50% 158 75% 137 90% 137 Let's check that assumption. In...
(2 points) For students in a certain region, scores of students on a standardized test approximately follow a normal distribution with mean u = 543.4 and standard deviation o = 26.9. In completing the parts below, you should use the normal curve area table that is included in your formula packet. (a) What is the probability that a single randomly selected student from among all those in region who took the exam will have a score of 548 or higher?...
The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-grade students. Scores on the test range from 0 to 500. Demonstrating the ability to use the mean to solve a problem is an example of the skills and knowledge associated with performance at the Basic level. An example of the knowledge and skills associated with the Proficient level is being able to read and interpret a stem-and-leaf plot. In 2015, 136,900 eighth-graders were in the NAEP sample...
Score points from exams of two courses were approximately normal distributed with the following means and standard deviations: III. Z-scores Score points from exams of two courses were approximately normal distributed with the following means and standard deviations Calc 1 : μ 75 points. σ-5 points Physics II: μ-70 points , σ 12 points [15%) Mary received 85 points in calc 1. John received 85 points in the physics 1 exam. Which performance is more impressive, Mary's or John's? In...
Suppose scores of students on a test are approximately normally distributed with a mean score of 65 points and a standard deviation of 8 points. It is decided to give A's to 10 percent of the students. Obtain the threshold score that will result in an A.
Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test for eighth-grade students follows a normal distribution with sd equal to 110. You want to estimate the true mean score within +/- 10 points with 90% confidence. Suppose you find out that the most you can sample is only 225 subjects. Now estimate the confidence level you could attain with n=225.
Scores on an exam follow an approximately Normal distribution with a mean of 76.4 and a standard deviation of 6.1 points. What percent of students scored below 70 points?
you were told that the mean score on a statistics exam is 75 with the scores normally distributed in addition you know the probability of a score is between 55 and 60 is 4.41%and that the probability of a score greater than 90 is 6.68% . the middle 95.46 of the students will score between which two scores?
Many states assess the skills of their students in various grades. One program that is available for this purpose is the National Assessment of Educational Progress (NAEP). One of the tests provided by the NAEP assesses the reading skills of twelfth-grade students. In a recent year, the national mean score was 284 and the standard deviation was 37 . Assume that these scores are approximately Normally distributed, N(284 , 37 ). How high a score is needed to be in...
Statistics Question... (10 pts) If the mean exam score of a class was 75%, with a standard deviation of 15%, what percent of students would be expected score at or higher than 92%? Assume that the distribution of the scores is normal and the variable is random 7.