Imagine that you are taking a very difficult test (in a statistics class of course), historically...

Imagine that you are taking a very difficult test (in a statistics class of course), historically the mean grade is 43.5 out of 100 with a standard deviation of 15.2. Treating the historical average and standard deviation as parameters of a normal curve:

A.) What is the probability of passing with a score of 60 or higher.

B.) What is the probability of getting an A- (90 to 92.5)

C.) If a new class of 35 students takes the test, how many students in the new class would you expect to get a B (80 to 89) ?

D.) Given your results assume that we actually gave such a test to 10 sections (of ten students each) and discovered that the average number of students getting an A on the exam in each section was 7. Using your knowledge of probability what can you suggest about this situation ?

Expert Solution

Dear Student a detailed handwritten solution is also provided.. Your satisfaction is more important to me.. If you are satisfied please Thumbs Up.. Thanks..

Answer

a) 0.13884

b) 0.0005

c) None of the students

d) Not possible

orchestra answered 2 years ago

Imagine the following scenario: You are taking the evidence-based practice course and one of your classmates...

Imagine the following scenario: You are taking the evidence-based practice course and one of your classmates shares an EBP project draft with you. You notice that some of the research has not been cited correctly or even at all. When you approach your classmate, the response is that "no one will notice and it is not a big deal anyway." What are your next steps in speaking with your classmate? Consider how this could reflect on the credibility and integrity...

A professor of a introductory statistics class has stated that, historically, the distribution of final exam...

A professor of a introductory statistics class has stated that, historically, the distribution of final exam grades in the course resemble a normal distribution with a mean final exam mark of 60% and a standard deviation of 9%. (a) What is the probability that a randomly chosen final exam mark in this course will be at least 75%? (b) In order to pass this course, a student must have a final exam mark of at least 50%. What proportion of...

First this is a very difficult question imagine a company hired u to produce a plan...

First this is a very difficult question imagine a company hired u to produce a plan for the upcoming product (instand noodle) u have 3k usd budget and the key point is promote online (facebook) and how to use psychology to attract more customer and raise awareness what is the strategy and how?what campaign will you come out? as detailed as possible for example ( using psychology of the human (greedy heart) like lucky draw ) two website facebook and...

A standardized test is given to a sixth grade class. Historically, the test scores have had...

A standardized test is given to a sixth grade class. Historically, the test scores have had a standard deviation of 21. The superintendent believes that the standard deviation of performance may have recently changed. She randomly sampled 30 students and found a mean of 160 with a standard deviation of 21.3846. Is there evidence that the standard deviation of test scores has increased at the α=0.025 level? Assume the population is normally distributed. Step 1 of 5: State the hypotheses...

A frequency distribution for the ages of randomly selected 27 students taking a statistics course in...

A frequency distribution for the ages of randomly selected 27 students taking a statistics course in a college is given below. a. Make a relative frequency histogram for the data. Label axes and units. b. What is the shape of the distribution? c. Compute the sample mean d. Use information from (c) to fill in the blanks in the following statement: In the sample of 27 students taking statistics, the average age of a student is about _______. Age Frequency...

A study is conducted for students taking a statistics class. Several variables are recorded in the survey. The...

A study is conducted for students taking a statistics class. Several variables are recorded in the survey. The 300 students were asked what type of car the student owns, the number of credit hours taken during that semester, the time the student waited in line at the bookstore to pay for his/her textbooks, and the home state of the students. 1. Which of the following plots would be appropriate to graph the home states of the students? bar graph, histogram, scatter plot,...

When an introductory statistics course has been taught live, the average final numerical grade has historically...

When an introductory statistics course has been taught live, the average final numerical grade has historically been 71.6% with a standard deviation of 8.8%. Forty students were selected at random to take a new online version of the same course, and the average final numerical grade for these students was found to be 69.2%. Assume that the grades for the online students are normally distributed and that the population standard deviation is still 8.8%. In parts (a) and (b), use...

In a study examining whether taking a statistics course influences students’ reasoning skill, a researcher first...

In a study examining whether taking a statistics course influences students’ reasoning skill, a researcher first gave a reasoning task to 5 students who have never taken a statistics course, and then the students took a brief statistics lecture which lasted 3 hours. After the lecture, the same five students took the reasoning task again. Their performance scores are summarized in the table below. Student ID Performance before the lecture Performance after the lecture A 6 8 B 7 7...

Nine students took the SAT. After taking it, they then took a test preparation course and...

Nine students took the SAT. After taking it, they then took a test preparation course and retook the SAT. Can you conclude that the course changes performance on the SAT? (use α = .1)

You are in charge of a group that is very difficult to work with because the...

You are in charge of a group that is very difficult to work with because the group members have little interest in doing the tasks to which they are assigned. Because you are accountable to your supervisors for seeing to it that the group gets the task finished, you realize you need to adjust your leadership style so that you can be sure the work is completed. What factor(s) you would consider as you determined what leadership style to adopt...

Question