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![solution: x = 145 m = 10 s = 2.5 * 95% contidence interval = x + tm-1,9% in 145 2.262 x 25 Vio = [143.21] care [146.79 ]](http://img.homeworklib.com/questions/2bb62d90-1261-11ea-986e-eb29edbba078.png?x-oss-process=image/resize,w_560)
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3. We have testified 10 students who joined the summer library program and got their reading comprehension score, mean...
We considered the differences between the reading and writing scores of a random sample of 200...
We considered the differences between the reading and writing scores of a random sample of 200 students who took the High School and Beyond Survey in Exercise 5.21. The mean and standard deviation of the differences are x̄read-write = -0.545 and 8.887 points respectively. (a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of all students. lower bound: points (please round to two decimal places) upper bound: points (please round to two decimal...
2. A new reading program was being evaluated in the fourth grade at an elementary school....
2. A new reading program was being evaluated in the fourth grade at an elementary school. A random sample of 35 students was tested on a fixed-length reading passage in order to measure their reading speed. The average reading time of the sample of 35 students was 9.5 minutes with a standard deviation of 2.5 minutes. A. Estimate the mean reading speed for all fourth-grade students in this clementary school. Use a 95% confidence level. (15) B. If a larger...
64 college students took a placement test. Their mean score was 29.5 points with a standard...
64 college students took a placement test. Their mean score was 29.5 points with a standard deviation of 7.3 points. Construct a 95% confidence interval for the mean score on this placement exam for all students.
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A...
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. EBM will be the largest O a when the population standard deviation is 12 points, when the population standard deviation is 18 points. OC when the population standard deviation is 15 points when the population standard deviation is 20 points Od b. Suppose we are interested to...
High School and Beyond, Part II: We considered the differences between the reading and writing scores...
High School and Beyond, Part II: We considered the differences between the reading and writing scores of a random sample of 200 students who took the high school and beyond survey in exercise 5.3. The mean and standard deviation of the differences are is = -0.545 and 8,887 points. a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of all students. b) Interpret this interval in context. c) Does the confidence interval provide...
The results of a study of 258 students who paid a private tutor to help them...
The results of a study of 258 students who paid a private tutor to help them improve their scores on a standardized test are shown below. The changes in both the Mathematics and Verbal scores for these students are reproduced in the table. Complete parts a through c below. Test score improvements Math Verbal Mean change in score 18 8 Standard deviation of score changes 67 50 a. Construct and interpret a 95% confidence interval for the population mean change...
Grades on a standardized test are known to have a mean of 1020 for students in...
Grades on a standardized test are known to have a mean of 1020 for students in the United States. The test is administered to 473 randomly selected students in Florida; in this sample, the mean is 1033.26 and the standard deviation (s) is 110.16. The 95% confidence interval for the average test score for Florida students is ( 1023.33, 1043.19 ). (Round your responses to two decimal places.) Is there statistically significant evidence that Florida students perform differently than other...
A group of 67 randomly selected students have a mean score of 31.3 with a standard...
A group of 67 randomly selected students have a mean score of 31.3 with a standard deviation of 5.3 on a placement test. What is the 90% confidence interval for the mean score of all students taking the test? 30.2 < 32.4 30.2 < р < 32.4 33.02 H1 < 35.04 33.02 < р < 35.04
A researcher wants to estimate the mean IQ score for a population of high school students....
A researcher wants to estimate the mean IQ score for a population of high school students. How many students will she have to select for the IQ tests if she wants 95% confidence the sample mean is within 3 IQ points of the population mean? Assume the population standard deviation is 15.
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...
2. A new reading program was being evaluated in the fourth grade at an elementary school. A random sample of 35 students was tested on a fixed-length reading passage in order to measure their reading speed. The average reading time of the sample of 35 students was 9.5 minutes with a standard deviation of 2.5 minutes. A. Estimate the mean reading speed for all fourth-grade students in this clementary school. Use a 95% confidence level. (15) B. If a larger...
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. EBM will be the largest O a when the population standard deviation is 12 points, when the population standard deviation is 18 points. OC when the population standard deviation is 15 points when the population standard deviation is 20 points Od b. Suppose we are interested to...
Grades on a standardized test are known to have a mean of 1020 for students in the United States. The test is administered to 473 randomly selected students in Florida; in this sample, the mean is 1033.26 and the standard deviation (s) is 110.16. The 95% confidence interval for the average test score for Florida students is ( 1023.33, 1043.19 ). (Round your responses to two decimal places.) Is there statistically significant evidence that Florida students perform differently than other...
A group of 67 randomly selected students have a mean score of 31.3 with a standard deviation of 5.3 on a placement test. What is the 90% confidence interval for the mean score of all students taking the test? 30.2 < 32.4 30.2 < р < 32.4 33.02 H1 < 35.04 33.02 < р < 35.04
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