USF gives a satisfaction survey to a sample of 200 graduate students. The average satisfaction score...
USF gives a satisfaction survey to a sample of 200 graduate students. The average satisfaction score was a 50 with a standard deviation of 13. What proportion of students scored between a 33 and a 76?
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USF gives a satisfaction survey to a sample of 200 graduate
students. The average satisfaction score...
Assume we are interested in looking at GRE scores of students admitted to graduate schools. Suppose...
Assume we are interested in looking at GRE scores of students admitted to graduate schools. Suppose GRE scores are Normally distributed with an average of 317 and a standard deviation of 11.5 points. Suppose we take a sample of 15 admitted students. What is the probability that the average GRE score from our sample of 15 students will be above 320?
(S pts) 11. The average composite ACT score for Oregon students who took the test in...
(S pts) 11. The average composite ACT score for Oregon students who took the test in 2003 was 21.4 with a standard deviation of 1.55. A random sample of 35 students who took the exam in 2003 is taken. a. What is the mean and standard deviation of the sampling distribution? b. What is the probability that the average composite ACT score is 21 or more? pes)12. The World Almanac and Book of Facts 2004 reported the percent of people...
A survey of students nationwide showed a mean ACT score of 21.4. A survey of 500...
A survey of students nationwide showed a mean ACT score of 21.4. A survey of 500 Colorado scores shows a mean of 20.8. Find the critical value to determine if Colorado ACT scores (μ1) are below the national average (μ2) using α = 0.05 when the population standard deviation is known.
You want to estimate the average GMAT score for all students who took the Logitano GMAT...
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...
Assume population mean IQ is 100 standard deviation 12 sample of 25 students and average score...
Assume population mean IQ is 100 standard deviation 12 sample of 25 students and average score was 108 If another sample of 25 students was selected, what is the probability that the sample would have a mean greater than 108?
One college class had a total of 90 students. The average score for the class on...
One college class had a total of 90 students. The average score for the class on the last exam was 86.3 with a standard deviation of 4.4. A random sample of 39 students was selected. a. Calculate the standard error of the mean. b. What is the probability that the sample mean will be less than 88? c. What is the probability that the sample mean will be more than 87? d. What is the probability that the sample mean...
Recorded math scores of 200 students and like to know if their average is significantly (a...
Recorded math scores of 200 students and like to know if their average is significantly (a = 0.05) different from the university average of 60. The average score of the 200 students is 62.8 and the standard deviation is 12. a) What are the null and the alternative hypothesis? b) What do you conclude?
A Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivational...
A Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivational attitude toward school, and study habits of students. Scores range from 0 to 200. The mean for Canadian college students is about 115, and the standard deviation is about 30. A teacher who suspects this population average to be incorrect gives the SSHA to 25 students who are at least 30 years of age. The sample average score is 127.8. Calculate the p-value.
For a certain law school, the entering students have an average LSAT score of about 700...
For a certain law school, the entering students have an average LSAT score of about 700 with a standard deviation of about 40. The smoothed density histogram of the LSAT scores appears to follow a normal distribution. Sketch a smoothed density histogram (a bell-shaped curve) of the distributions for the LSAT scores. (For this problem, draw this on your own paper. You will not need to submit this graph.) Because this distribution is approximately normal, the mean is equal to...
A random sample of 115 students has a test score average of 78 with a standard...
A random sample of 115 students has a test score average of 78 with a standard deviation of 10.3. Find the margin of error if the confidence level is 0.99. (Round answer to two decimal places)
(S pts) 11. The average composite ACT score for Oregon students who took the test in 2003 was 21.4 with a standard deviation of 1.55. A random sample of 35 students who took the exam in 2003 is taken. a. What is the mean and standard deviation of the sampling distribution? b. What is the probability that the average composite ACT score is 21 or more? pes)12. The World Almanac and Book of Facts 2004 reported the percent of people...
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