True or false: On an exam, Tom scored 14 points above the mean and had a...
The first statistics exam had on both tests. Megan scored 90 on the first exam and 78 on the second. They both totaled 168 points on the two exams, but Anna claims that her total is better. Explain. mean of 68 and a standard deviation of 16 points; the second had a mean of 85 and a standard deviation of 4 points. Anna scored a 84 , which is greater than Megan's total of The total of Anna's z-scores is...
7) A retired statistics professor has recorded final exam results for decades. The mean final exam score for the population of her students is 82.4 with a standard deviation of 6.5 . In the last year, her standard deviation seems to have changed. She bases this on a random sample of 25 students whose final exam scores had a mean of 80 with a standard deviation of 4.2 . Test the professor's claim that the current standard deviation is different...
Let's say you scored a 111 on Exam 1 and you scored a 125 on Exam 2. You can predict your final exam score with the following prediction equation: Y' = bX + c (round to the nearest whole number). X is the total number of points you earned on the first two tests. Given: Mean =120, Standard deviation = 100. The correlation (r) between the total score on the first two exams and the final is 0.89, b =...
Assume that scores on the verbal portion of the GRE (Graduate Record Exam) follow the normal distribution with mean score 151 and standard deviation 7 points, while the quantitative portion of the exam has scores following the normal distribution with mean 153 and standard deviation 7.67. Use this information to answer the following: (Please round to two decimal places) a) Find the score of a student who scored in the 80th percentile on the Quantitative Reasoning section of the exam....
1.500 University student's exam scores are determined at the end of the semester. Patty scored 850 marks (X) in total out of 1000. The average score for the tests was 725 (u) and the standard deviation was 180 (a). Let's find out how well Patty scored compared to her peers. Using the above data we need to first standardize his score and use the respective 2-table to determine how well he performed compared to his batch mates. To find out...
If a student scored 76 points on a test where the mean score was 80.5 and the standard deviation was 5.1. The student's z score is ________. Explanation with math please
Test grades on the last statistics exam had a mean = 77 and standard deviation = 24 Suppose the teacher decides to curve by subtraction 32 from all scores then doubling the values. If Y represents the new test scores, what is the mean and standard deviation of Y? a) EM-90; ơ--59.2 b) EM = 154;Oy=9.6 c) EM-122; σ-48 EM : 45; σ--27.2 e) None of the above
THINKING/COMMUNICATION 7. A post-secondary class has 600 students. The mean grade on their midterm exam is 70%, with a standard deviation of 15. a. Find the Z-score of a student who scored 80% on his exam. [2 marks] b. Find the percentage of students who failed the exam. [3 marks] c. How many students failed the exam (i.e. scored less than 49%)? [1 mark] d. Your friend claims he scored in the 99th percentile on his exam. What mark must...
14. On an exam with a mean of μ = 70, you have a score of X = 75. Which of the following values for the standard deviation would give you the highest position within the class? Hint: Graph the mean and figure out which standard deviation makes the most sense for getting a high score. How far away from the mean do we want the score of 75 to be? a. σ = 1 b. σ = 5 c....
12. A certain group of test subjects had pulse rates with a mean of 84.484.4 beats per minute and a standard deviation of 11.211.2 beats per minute. Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of 56.856.8 beats per minute significantly low or significantly high? Significantly low values are nothing beats per minute or lower. (Type an integer or a decimal. Do not round.) 14....