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Suppose that 20% of the students who took a test from school A, and that the...
(4)Five hundred students from a local high school took a college entrance examination. Historical data from the school record show that the standard deviation of test scores is 40. A random sample of thirty- six students is taken from the entire population of 500 students. The mean test score for the sample is three hundred eighty. Find (a) 95% confidence interval for the unknown population mean test score. (b) 95% confidence interval for the unknown population mean test score if...
The following information corresponds to students who Took Test 4. The mean score was 59.98 points and the standard deviation was 13.18. Assume scores for Test 4 are normally distributed. If 10 students are randomly selected, find the probability that the mean of their test score is greater than 56.
The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean μ=556.6 and standard deviation σ=27.7.(a) What is the probability that a single student randomly chosen from all those taking the test scores 562 or higher?For parts (b) through (d), consider a simple random sample (SRS) of 35 students who took the test.(b) What are the mean and standard deviation of the sample mean score x̅x̅, of 35 students?The mean...
The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean μ=557.1 and standard deviation σ=29. (a) What is the probability that a single student randomly chosen from all those taking the test scores 562 or higher? For parts (b) through (d), consider a simple random sample (SRS) of 35 students who took the test. (b) What are the mean and standard deviation of the sample mean score x¯, of...
The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean ?=537μ=537 and standard deviation ?=27.5σ=27.5. (a) What is the probability that a single student randomly chosen from all those taking the test scores 542 or higher? ANSWER: For parts (b) through (d), consider a simple random sample (SRS) of 25 students who took the test. (b) What are the mean and standard deviation of the sample mean score ?¯x¯,...
The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean μ=553.3 and standard deviation σ=28.6.Round z-scores to 2 decimal places and give probabilities to 4 decimal places. (a) What is the probability that a single student randomly chosen from all those taking the test scores 558 or higher? ANSWER: For parts (b) through (d), consider a simple random sample (SRS) of 30 students who took the test. (b) What...
(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?...
1. Suppose in a class of 100 students who took an exam scored out of 100, the 68thpercentile of the exam scores was 72. Thus, _________% of the students who took the exam scored less than a 72. a.32% b.68% c.72% d.28% e.None of the above 2. Suppose in a class of 80 students who took an exam scored out of 100, the 40thpercentile of the exam scores was 58. Approximately how many of the 80 students scored above a...
An entire Science class took a test, and the results are broken down below based on the group (ie. Group A or B) each student belongs in Group A Group B Mean 80 60 SD 16 10 Assuming the distribution of test scores were fairly normal for both Group A and Group B, please figure out the following: A. If a student in Group A gets a score of 85, what's her 2 score? B. What's the 2-score for a...
You want to estimate the average GMAT score for all students who took the Logitano GMAT Preparation course during the past 2 years. You select a random sample of 100 such students from a comprehensive list of all students who took the course over the last two years and find that the average GMAT score for the sample was 1040. Suppose now you build a 95% confidence interval estimate of the average score for the population of Logitano students represented...