In a class of 25 students, 24 of them took an assignment in class and 1...

In a class of 25 students, 24 of them took an assignment in class and 1 student took a make-up assignment the following day. The professor graded the first batch of 24 assignments and found an average score of 74 points with a standard deviation of 8.9 points. The student who took the make-up the following day scored 64 points on the assignment.

(a) Does the new student's score increase or decrease the average score? how

(b) What is the new average? Show your work - Use weighted mean.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

1. The mean age of College students is 25. A certain class of 33 students has...

1. The mean age of College students is 25. A certain class of 33 students has a mean age of 22.64 years. Assuming a population standard deviation of 2.87 years, at the 5% significance level, do the data provide sufficient evidence to conclude that the mean age of students in this class is less than the College mean? a. Set up the hypotheses for the one-mean ?-test. ?0: ??: b. Compute the test statistic. Round to two decimal places. c....

A: You recently took a statistics class in a large class with n = 500 students....

A: You recently took a statistics class in a large class with n = 500 students. The instructor tells the class that the scores were Normally distributed, with a mean of 7 2 (out of 100 ) and a standard deviation of 8 , but when you talk to other students in the class, you find out that more than 30 students have scores below 45 . That violates which rule for the Normal distribution? the 30–60–90 rule the 1–2–3...

In a situation where there are 25 students in a class (studentsare numbered from 1...

In a situation where there are 25 students in a class (students are numbered from 1 to 25) and they each have random birthdays so every birthday has a probability of 1/365, there is an event E[a, b] where a and b is each pair of students.1. How many possible events are there and what is the probability of each one?2. What is the expected number of pairs of students who would share a birthday (using linearity of expectation)?3. Would...

You took independent random samples of 20 students at City College and 25 students at SF...

You took independent random samples of 20 students at City College and 25 students at SF State. You asked each student how many sodas they drank over the course of a year. The sample mean at City College was 80 and the sample standard deviation was 10. At State the sample mean was 90 and the sample standard deviation was 15. Use a subscript of c for City College and a subscript of s for State. Calculate a point estimate...

Students in a statistics class took their first test. The following are the score they earned....

Students in a statistics class took their first test. The following are the score they earned. Create a histogram for the data and describe the findings Scores(62,87,81,69,69 ,87,60,45,95,76,76 62,71,65,67,67,72,80,40,77,87,58 84,73,90,64,64,89) a)Find the mean, median, and modal class. b)What is inter quartile range? c)What is standard deviation of the test score? d)Is the score of 40 unusual? Why?

A researcher took a sample of 14 students and put them into three different groups. The...

A researcher took a sample of 14 students and put them into three different groups. The three different groups are taught the same materials but using a different teaching style. The styles are either in class, hybrid, or online. The students are graded between 0 and 20 for the final grades. The individual grades by groups is shown below. The group standard deviation is also shown below. You are hired to test if teaching style has an impact on the...

In a class of 25 students the average grade on a quiz is 16.85, with a...

In a class of 25 students the average grade on a quiz is 16.85, with a sample standard deviation of 4.75. The grades are known to be normally distributed. a. Determine the standard error of the mean. b. Determine the 98% confidence interval for the class grades. c. If you wanted a narrower interval, would you increase or decrease the confidence level?

INSTRUCTIONS: Attempt ALL questions There are 30 students in a class. Among them, 8 students are...

INSTRUCTIONS: Attempt ALL questions There are 30 students in a class. Among them, 8 students are learning both Audit and Tax. A total of 18 students are learning Audit. If every student is learning at least one language, how many students are learning Tax in total? Among a group of students, 50 played cricket, 50 played hockey and 40 played volley ball. 15 played both cricket and hockey, 20 played both hockey and volley ball, 15 played cricket and volley...

AT coaching: A sample of 10 students took a class designed to improve their SAT math...

AT coaching: A sample of 10 students took a class designed to improve their SAT math scores. Following are their scores before and after the class. Before After 451 454 453 463 491 511 526 529 473 493 440 466 481 482 459 455 399 404 383 420 Send data to Excel Part: 0 / 2 0 of 2 Parts Complete Part 1 of 2 (a) Construct a 95% confidence interval for the mean increase in scores after the class....

5. A class of undergraduate criminal justice students took a test and the average score of...

5. A class of undergraduate criminal justice students took a test and the average score of the class was 280 with a standard deviation equal to 40. What minimum score does a student need to obtain in order to pass the exam? (60th percentile and above) What is the minimum score a student need to receive in order to get at least a B (80th percentile) at the exam?

Subjects