A kinesiology professor, requiring volunteers for her study, approaches students one by one at a campus...
A kinesiology professor, requiring volunteers for her study, approaches students one by one at a campus hub. She will continue until she acquires 40 volunteers. Suppose that 25% of students are willing to volunteer for the study, that the professor’s selections are random, and that the student population is large enough that individual “trials” (asking a student to participate) may be treated as independent.
(a) What is the expected number of students the kinesiology professor will need to ask in order to get 40 volunteers? What is the standard deviation?
(b) Determine the probability that the number of students the kinesiology professor will need to ask is within one standard deviation of the mean.
Homework Answers
since sample size is large, we
can approximate the distribution to the normal distribution z.
Add Answer to:
A kinesiology professor, requiring volunteers for her study,
approaches students one by one at a campus...
A professor wants to estimate how many hours per week her students study. A simple random...
A professor wants to estimate how many hours per week her students study. A simple random sample of 56 students had a mean of 19 hours of studying per week. Construct a 98% confidence interval for the mean number of hours a student studies per week. Assume that the population standard deviation is known to be 2.4 hours per week. Round to two decimal places.
Suppose there are 40 students in my class. Out of which, 8 students live on campus...
Suppose there are 40 students in my class. Out of which, 8 students live on campus housing. If I select 15 students at random from this class of 40, find the probability that more than 3 live on campus housing. (Bonus) 35.18% 39.80% 64.81% 25.01% 60.19% A box contains 4 red and 6 black balls if two balls are selected at random without replacement and colors of the balls are noted. In this experiment, we don't know how many red...
Scores on Professor Combs Statistics Final Exams have a long term history of being normally distributed with a mean of μ=70 and a standard deviation of σ=8
Scores on Professor Combs Statistics Final Exams have a long term history of being normally distributed with a mean of μ=70 and a standard deviation of σ=8 a.) Find the probability that a single student will score above a 75 on the Final exam. b.) Find the probability that a single student will score between a 65 and 75 on the Final exam. c.) Find the probability that an entire class of 20 students will have a class average above a 75 on...
A recent study has shown that 28% of 18-34 year olds check their Facebook/Instagram feeds before getting out of bed in t...
A recent study has shown that 28% of 18-34 year olds check their Facebook/Instagram feeds before getting out of bed in the morning, If we sampled a group of 150 18-34 year olds, what is the probability that the number of them who checked their social media before getting out of bed is: a.) At least 34? b.) No more than 50? c.) between 40 and 44 (including 40 and 44)? Use the Normal Approximation to the Binomial distribution to...
Dean Halverson recently read that full-time college students study 20 hours each week. She decides to...
Dean Halverson recently read that full-time college students study 20 hours each week. She decides to do a study at her university to see if there is evidence that students study an average of less than 20 hours each week. A random sample of 32 students were asked to keep a diary of their activities over a period of several weeks. It was found that he average number of hours that the 32 students studied each week was 19.1 hours....
show all work please A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three...
show all work please
A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three groups and sends them to three different rooms. In the first room, students hear white noise, in the second, music from a local radio station, and in the third, the door is closed to help block out normal sound from the hall. Each group is...
Two researchers conducted a study in which two groups of students were asked to answer 42...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.2 with a standard deviation...
You will be developing an Advising Scheduling Management System (ASMS) that can be used managing the advising appointments for Salisbury University professors and their advisees (students). ASMS shoul...
You will be developing an Advising Scheduling Management System (ASMS) that can be used managing the advising appointments for Salisbury University professors and their advisees (students). ASMS should have the following functionalities: - There are three kinds of users: professor, student and admin. When ASMS starts, a login screen asks user which kinds of users and then asks user id and password. If id or password are incorrect, issue a warning and redisplay the login screen. - When an admin...
10. A tennis player estimates that her serves are good 75% of the time. If she...
10. A tennis player estimates that her serves are good 75% of the time. If she serves 12 ti mes, what is the probability that at least 7 of them are good? A. 0.0544 B. 0.1576 C. 0.9456 D. 0.8423 11. Carbon monoxide (CO) emissions for a certain kind of car follow a normal distribution and have a mean of 2.9 g/mi and standard deviation 0.4 g/mi. A company has 40 of these cars in its fleet. What is the...
MAT 107 Project: Age of Students in College Professor Sumner Collect Data: (5 points) You will need to ask 30 college students their age. The students can attend any college or university. Use the tab...
MAT 107 Project: Age of Students in College Professor Sumner Collect Data: (5 points) You will need to ask 30 college students their age. The students can attend any college or university. Use the table below to input the data you collected. If you do the work for this project by hand, you must show the work you do to arrive at your results to earn full credit. If you use technology (computer, calculator, etc.) to obtain the results, you...
Suppose there are 40 students in my class. Out of which, 8 students live on campus housing. If I select 15 students at random from this class of 40, find the probability that more than 3 live on campus housing. (Bonus) 35.18% 39.80% 64.81% 25.01% 60.19% A box contains 4 red and 6 black balls if two balls are selected at random without replacement and colors of the balls are noted. In this experiment, we don't know how many red...
show all work please
A professor predicts that students will lean better if they study to white noise (similar to a fan) compared to music or no sound. She randomly divides 27 students into three groups and sends them to three different rooms. In the first room, students hear white noise, in the second, music from a local radio station, and in the third, the door is closed to help block out normal sound from the hall. Each group is...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.2 with a standard deviation...
10. A tennis player estimates that her serves are good 75% of the time. If she serves 12 ti mes, what is the probability that at least 7 of them are good? A. 0.0544 B. 0.1576 C. 0.9456 D. 0.8423 11. Carbon monoxide (CO) emissions for a certain kind of car follow a normal distribution and have a mean of 2.9 g/mi and standard deviation 0.4 g/mi. A company has 40 of these cars in its fleet. What is the...
Most questions answered within 3 hours.
-
1- What are 5 general characteristics of Botticelli’s
paintings?
2- Describe 5 important traits of Flemish...
asked 1 hour ago -
A golfer claims that his average golf score at the course he
plays regularly is less...
asked 1 hour ago -
On May 1, First Bank perfected a security interest in Debtor’s
inventory. On June 1, Bob...
asked 2 hours ago -
A new kind of typhoid shot is being developed by a medical
research team. The old...
asked 3 hours ago -
Write a chemical equation for these reactions. (Use
the lowest possible whole number coefficients.) Include
states-of-matter...
asked 5 hours ago -
For each of the Z-scores below, determine two probabilities
(show four three decimal places): (1) the...
asked 6 hours ago -
Oxidative phosphorylation is achieved through chemiosmotic
coupling, which turns chemical energy into osmotic potential energy
that...
asked 9 hours ago -
Hollywood Shoes would like to maintain their cash account at a
minimum level of $64,000, but...
asked 9 hours ago -
Proteins CtrA-P, DnaA, and GcrA behave similarly to what
molecule in the Eukaryotic Cell Cycle?
asked 9 hours ago -
TRUE OR FALSE
In case of a competitive tender procedure, in the request for
quotation, the...
asked 9 hours ago -
I am a little behind please provide some explanation, will
provide thumbs up.
This question considers...
asked 9 hours ago -
Let say the utility function as U(X,Y) = lnX + Y. Show that the
marginal rate...
asked 9 hours ago