Fifty students are enrolled in an Economics class. After the first examination, a random sample of...
Fifty students are enrolled in an Economics class. After the first examination, a random sample of five papers was selected. The grades were 60, 70, 75, 80, 90.
a. Calculate the estimate of the standard error of the mean.
b. What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why?
c. Assume the assumption of part(b) is met. Provide a 90% confidence interval for the mean grade of all the students in the class.
d. If there were 200 students in the class, what would be the 90% confidence interval for the mean grade of all the students in the class
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Fifty students are enrolled in an Economics class. After the
first examination, a random sample of...
Fifty students are enrolled in an Economics class. After the first examination, a randomsample of five...
Fifty students are enrolled in an Economics class. After the first examination, a randomsample of five papers was selected. The grades were 60, 75, 80, 70, and 90. Assume the distributionof all the grades is normal. Provide an approximate 90% confidence interval for the mean grade of allthe students in the class.
3. The histogram to the right shows the number of students in a math class with...
3. The histogram to the right shows the number of students in a math class with each grade. a. How many students are in the math class? b, which interval would have the grade 70%? . Which interval of grade was most common? d. Find the probability a random student chosen Student Grades ' 1叶 8 will be earning a B (80-90). 50 60 70 80 90 100 The teacher teaches a total of 120 students in all math classes....
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 24 students, the mean age is found to be 23.1 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.6 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error
Based on a random sample of 20 students from a PE class, they exercise 1.6 hours...
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From a random sample of 66 students in an introductory finance class that uses group-learning techniques, the mean examination score was found to be 79.79 and the sample standard deviation was 2.7. For an independent random sample of 99 students in another introductory finance class that does not use group-learning techniques, the sample mean and standard deviation of exam scores were 72.14 and 8.8 respectively. Estimate with 90% confidence the difference between the two population mean scores; do not assume...
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3. The histogram to the right shows the number of students in a math class with each grade. a. How many students are in the math class? b, which interval would have the grade 70%? . Which interval of grade was most common? d. Find the probability a random student chosen Student Grades ' 1叶 8 will be earning a B (80-90). 50 60 70 80 90 100 The teacher teaches a total of 120 students in all math classes....
In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. a. At least what percentage of the students received grades between 50 and 100? Determine an interval for the grades that will be true for at least 70% of the students. b.
A department of education reported that in 2007, 68% of students enrolled in college or a trade school within 12 months of graduating from high school. In 2013, a random sample of 160 individuals who graduated from high school 12 months prior was selected. From this sample, 106 students were found to be enrolled in college or a trade school. Complete parts a through c below. a. Construct a 90% confidence interval to estimate the actual proportion of students enrolled...
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