The Mathematics test scores for BEKM students were analyzed and stored in a file. Assuming the...

The Mathematics test scores for BEKM students were analyzed and stored in a file. Assuming the scores are normally distributed. Knowing that 20% of the mean scores were above 70 and 15% of the mean scores were below 40, find their mean and standard deviation of the test scores for the students

Expert Solution

orchestra answered 1 year ago

The IELTS scores for International students were analyzed and stored in a file. Assuming that the...

The IELTS scores for International students were analyzed and stored in a file. Assuming that the scores are normally distributed and knowing that 15% of the mean scores were below 45 and 20% of the mean scores were above 75, show how you can determine their mean and standard deviation of the test scores for the students.(5 Points)

Researchers are always looking for methods to help students improve their mathematics test scores.

Researchers are always looking for methods to help students improve their mathematics test scores. A company recently announced that they have found a way to help college students complete a certain mathematics test more quickly. The company said that using a specific meditation method for 20 minutes, before taking a mathematics test, would help students complete the test more quickly. Researchers have done studies, with thousands of general college students, to see how long it takes them (in minutes)...

The scores of fourth grade students on a mathematics achievement test follow a normal distribution with...

The scores of fourth grade students on a mathematics achievement test follow a normal distribution with a mean of 75 and standard deviation of 4. What is the probability that a single student randomly chosen form all those taking the test scores 80 or higher? What is the probability that the sample mean score of 64 randomly selected student is 80 or higher?

Scores on the SAT Mathematics test are believed to be normally distributed. The scores of a...

Scores on the SAT Mathematics test are believed to be normally distributed. The scores of a simple random sample of five students who recently took the exam are 570, 620, 710, 540 and 480. We want to find a 95% confidence interval of the population mean of SAT math scores. A) Calculate the point estimate. (Round to four decimal places as needed.) B) Calculate the sample standard deviation. (Round to four decimal places as needed.) C) Calculate the standard error...

A random sample of 83 eighth grade students' scores on a national mathematics assessment test has...

A random sample of 83 eighth grade students' scores on a national mathematics assessment test has a mean score of 278. This test result prompts a state school administrator to declare that the mean score for the state's eighth-graders on this test is more than 275. Assume that the population standard deviation is 35. At α=0.08 is there enough evidence to support the administration's claim? Complete parts (a) through (e). A is done B: fine the standardized test statistic z,...

A random sample of 80 eighth grade students' scores on a national mathematics assessment test paper...

A random sample of 80 eighth grade students' scores on a national mathematics assessment test paper has a mean score of 269. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this paper is more than 260 Assume that the population standard deviation is 31. At alphaαequals=0.06 is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify Upper...

The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth‑grade students. Scores on...

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...

A random sample of 77 eighth-grade students' scores on a national mathematics assessment test has a...

A random sample of 77 eighth-grade students' scores on a national mathematics assessment test has a mean score of 264 with a standard deviation of 40. This test result prompts a state school administrator to declare that the mean score for the state's eighth-graders on this exam is more than 260. At a=0.09, is there enough evidence to support the administration's claim? Complete parts (a) through (e).

The Test results of the Business Statistics were published and the scores were as followed Students...

The Test results of the Business Statistics were published and the scores were as followed Students 12 14 10 13 17 12 11 15 Results 5 11 7 8 11 7 6 9 Only 2 decimal places Determine the α (alpha) Coefficient in the regression equation * 4 points Your answer Advise if increasing the number of students to 50 will improve the students’ test scores * 2 points Remain the same Increase Decrease Determine the β Coefficient in the...

Write a C++ program that reads a file consisting of students’ test scores in the range...

Write a C++ program that reads a file consisting of students’ test scores in the range 0–200. It should then determine the number of students having scores in each of the following ranges: 0–24, 25–49, 50–74, 75–99, 100–124, 125–149, 150–174, and 175–200. Output the score ranges and the number of students. (Run your program with the following input data: 76, 89, 150, 135, 200, 76, 12, 100, 150, 28, 178, 189, 167, 200, 175, 150, 87, 99, 129, 149, 176,...

Question