To check the efficiency of the remote teaching, one professor from the department of Statistics performed...
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To
check the efficiency of the remote teaching, one professor from the
department of Statistics performed...
A professor of statistics noticed that the marks in his course are normally distributed. He also...
A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classes average 75% with a standard deviation of 13% on their final exams. His afternoon classes average 76% with a standard deviation of 12%. A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class? Probability = .4761 B. What is the...
In one statistics class, students were given one homework assignment. The professor asked students to find...
In one statistics class, students were given one homework assignment. The professor asked students to find an example of a multinomial population and then to develop a hypothesis test. One student found an example – He selected four classes in fall 2010: Management, Accounting, Finance, and Economics. He computed the proportion of students who received an A grade for each class in fall 2010. The proportion of students who received an A grade in Management (M), Accounting (A), Finance (F),...
Show all work by hand. A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights ar...
Show all work by hand.
A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights are more variable than women's heights. To test the claim, he randomly selected 41 male students from a nearby all-male college and found the standard deviation to be 2.9 inches. Use this sample data and a significance level of a 0.01 to test the professor's claim that the standard deviation of...
Q1. Hypothesis testing using a Z test (14 points) A professor has been teaching introductory statistics...
Q1. Hypothesis testing using a Z test (14 points) A professor has been teaching introductory statistics for many years and the final exam performance (30 points total) has been very consistent from class to class and the scores have been normally distributed. Overall, the whole data base (i.e. population) of final exam scores has a mean (μ) of 20 points and a standard deviation (σ) of 5 points. Because 20 out of 30 is only about 67%, the professor would...
The Ohio Department of Education maintains records of average number of years of teaching experience for...
The Ohio Department of Education maintains records of average number of years of teaching experience for each public school in the state. During the 2012-2013 school year, it was reported that the average number of years of teaching experience at Ohio high schools was 14.3 years. Suppose that an intern working in educational policy research wants to determine whether the average number of years of teaching experience of teachers in Ohio high schools changed between the 2012-2013 and 2013-2014 school...
A mathematics professor wants to determine whether there has been a significant difference in the final...
A mathematics professor wants to determine whether there has been a significant difference in the final percentage averages between the Fall and Spring semesters (semester I and semester II respectively) of his Business Statistics classes he taught for the past 25 years. During this time, the professor taught very large sections of the courses in large lecture theaters. In a random sample of 62 students from semester I, the mean of the final percentages was 80 with a standard deviation...
stats Q1. Hypothesis testing using a Z test (14 points) A professor has been teaching introductory...
stats Q1. Hypothesis testing using a Z test (14 points) A professor has been teaching introductory statistics for many years and the final exam performance (30 points total) has been very consistent from class to class and the scores have been normally distributed. Overall, the whole data base (i.e. population) of final exam scores has a mean (μ) of 20 points and a standard deviation (σ) of 5 points. Because 20 out of 30 is only about 67%, the professor...
in comparing the engagement levels of first-year statistics students. In a previous nation-wide study, engagement levels...
in comparing the engagement levels of first-year statistics students. In a previous nation-wide study, engagement levels were found to be normally distributed, with µ=60.00, σ=10.00. The lecturer collects a convenience sample of 50 first-year students and finds that her students have a mean engagement level equal to 75.54. What statistical procedure should be used, to test whether there is a significant mean difference in engagement levels between the lecturer’s first year students and the population average? a. One sample Z-test....
A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering classes from previ...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classes average 75% with a standard deviation of 13% on their final exams. His afternoon classes average 76% with a standard deviation of 12%. A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class? Probability = .4761 B. What is the...
Show all work by hand.
A statistics professor at an all-women's college determined that the standard deviation of women's heights is 2.5 inches. The professor claims that men's heights are more variable than women's heights. To test the claim, he randomly selected 41 male students from a nearby all-male college and found the standard deviation to be 2.9 inches. Use this sample data and a significance level of a 0.01 to test the professor's claim that the standard deviation of...
The Ohio Department of Education maintains records of average number of years of teaching experience for each public school in the state. During the 2012-2013 school year, it was reported that the average number of years of teaching experience at Ohio high schools was 14.3 years. Suppose that an intern working in educational policy research wants to determine whether the average number of years of teaching experience of teachers in Ohio high schools changed between the 2012-2013 and 2013-2014 school...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
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