Question
In: Statistics and Probability
At a certain university 12% of students are left hand users. Suppose that a random sample...
At a certain university 12% of students are left hand users. Suppose that a random sample of 8 students were admitted in 2015 is selected.
(a) What is the probability that none of them will be a left hand user?
(b) What is the probability that 5 of them are left hand users?
(c) What is the probability that at least 7 of them are left hand user?
(d) What is the probability that at most 7 of them are left hand user?
(e) What is the probability that between 4 and 6 (inclusive) of them are left hand user?
(f) What is the expected value and standard deviation of number of users with left hand?
Solutions
orchestra answered 1 year agoRelated Solutions
A random sample of 12 second-year university students enrolled in a business statistics course was drawn....
A random sample of 12 second-year university students enrolled
in a business statistics course was drawn. At the course's
completion, each student was asked how many hours he or she spent
doing homework in statistics. The data are listed below.
40, 41, 29, 30, 31, 31, 34, 29, 37, 41, 37, 40
It is known that the population standard deviation is 8. The
instructor has recommended that students devote 3 hours per week
for the duration of the 12-week semester,...
A random sample of 12 second-year university students enrolled in a business statistics course was drawn....
A random sample of 12 second-year university students enrolled
in a business statistics course was drawn. At the course's
completion, each student was asked how many hours he or she spent
doing homework in statistics. The data are listed below.
281726262620292823271820282626292318172620282720
It is known that the population standard deviation is 9. The
instructor has recommended that students devote 2 hours per week
for the duration of the 12-week semester, for a total of 24 hours.
Test to determine whether there...
A random sample of 12 second-year university students enrolled in a business statistics course was drawn....
A random sample of 12 second-year university students enrolled
in a business statistics course was drawn. At the course’s
completion, each student was asked how many hours he or she spent
doing homework in statistics. The data are listed here. It is know
that the population standard deviation is 8. The instructor has
recommended that the students devote 36 hours to the course for the
semester. Test to determine at the 1% significance level whether
there is evidence that the...
A random sample of 12 second-year university students enrolled in a business statistics course was drawn....
A random sample of 12 second-year university students enrolled
in a business statistics course was drawn. At the course's
completion, each student was asked how many hours he or she spent
doing homework in statistics. The data are listed below. 28 18 15
20 14 25 21 29 20 23 24 26 It is known that the population standard
deviation is 6. The instructor has recommended that students devote
2 hours per week for the duration of the 12-week semester,...
A random sample of 250 students at a university finds that these students take a mean...
A random sample of 250 students at a university finds that these
students take a mean of 14.3 credit hours per quarter with a
standard deviation of 1.5 credit hours. Estimate the mean credit
hours taken by a student each quarter using a 98% confidence
interval.
A random sample of 250 students at a university finds that these students take a mean...
A random sample of 250 students at a university finds that these
students take a mean of 15.7 credit hours per quarter with a
standard deviation of 1.5 credit hours. Estimate the mean credit
hours taken by a student each quarter using a 98% confidence
interval.
Suppose you administer a certain aptitude test to a random sample of 9 students in your...
Suppose you administer a certain aptitude test to a random
sample of 9 students in your high school, and the average score is
105. We want to determine the mean μ of the population of all
students in the school. Assume a standard deviation of σ = 15 for
the test. Round all answers to 2 decimals.
1.What is the margin of error for a 98% confidence interval?
2.What would be the interval for a 98% confidence interval?
3. Write...
In a local university, 40% of the students live in the dormitories. A random sample of...
In a local university, 40% of the students live in the
dormitories. A random sample of 80 students is selected for a
particular study. The probability that the sample proportion (the
proportion living in the dormitories) is at least 0.30 is
Select one:
a. 0.0336
b. 0.9664
c. 0.9328
d. 0.4664
In a large university, 20% of the students are male. If a random sample of twenty...
In a large university, 20% of the
students are male. If a random sample of twenty two students is
selected
a.
What is the probability that the sample contains exactly twelve
male students?
b.
What is the probability that the sample will contain no male
students?
c.
What is the probability that the sample will contain exactly
twenty female students?
d.
What is the probability that the sample will contain more than
nine male students?
e.
What is the probability...
A sample of 36 MBA students at a certain university produces a mean age of 26.5...
A sample of 36 MBA students at a certain university produces a
mean age of 26.5 years with a standard deviation of 10.24 years.
Which of the following is the 90% confidence interval for the mean
age of all MBA students at this university based on this
sample.
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