Question
In: Statistics and Probability
. A teaching assistant for Statistics course as a university collected data from students in her...
. A teaching assistant for Statistics course as a university collected data from students in her class to investigate whether study time per week (average number of hours) differed between students who planned to go to graduate school and those who did not. The data were as follows:
Graduate school: 15, 7, 15, 10, 5, 5, 2, 3, 12, 16, 15, 37, 8, 14, 10, 18, 3, 25, 15, 5, 5
No graduate school: 6, 8, 15, 6, 5, 14, 10, 10, 12, 5.
State the null and alternative hypotheses using statistical notations. Use R command t.test to test whether study time differed between two groups. Include your R output and identify the test statistic and p-value. Draw the conclusion.
Solutions
Expert Solution
---------------------------------------------------------------------------------------------------------------------------------------
The conclusion based on the R-output:
orchestra answered 1 year agoRelated Solutions
Students enrolled in an introductory statistics course at a university were asked to take a survey...
Students enrolled in an introductory statistics course at a
university were asked to take a survey that indicated whether the
student’s learning style was more visual or verbal. Each student
received a numerical score ranging from -11 to +11. Negative scores
indicated a visual learner, and positive scores indicated a verbal
learner. The closer the score was to -11 or +11, the stronger the
student’s inclination toward that learning style. A score of 0
would indicate neutrality between visual or...
Students enrolled in an introductory statistics course at a university were asked to take a survey...
Students enrolled in an introductory statistics course at a
university were asked to take a survey that indicated whether the
student’s learning style was more visual or verbal. Each student
received a numerical score ranging from -11 to +11. Negative scores
indicated a visual learner, and positive scores indicated a verbal
learner. The closer the score was to -11 or +11, the stronger the
student’s inclination toward that learning style. A score of 0
would indicate neutrality between visual or...
Students enrolled in an introductory statistics course at a university were asked to take a survey...
Students enrolled in an introductory statistics course at a
university were asked to take a survey that indicated whether the
student’s learning style was more visual or verbal. Each student
received a numerical score ranging from -11 to +11. Negative scores
indicated a visual learner, and positive scores indicated a verbal
learner. The closer the score was to -11 or +11, the stronger the
student’s inclination toward that learning style. A score of 0
would indicate neutrality between visual or...
Three classes in elementary statistics are taught by three different persons : a regular faculty member, a graduate teaching assistant, and an adjunct from outside the university.
Three classes in elementary statistics are taught by three different persons : a regular faculty member, a graduate teaching assistant, and an adjunct from outside the university. At the end of the semester, each student is given a standardized test. Five students are randomly picked from each of these classes, and their scores are as shown in Table (a) Construct an ANOVA table and interpret your results.(b) Test at the 0.05 level whether there is a difference between the mean...
2. According to survey data collected from 500 students in a recent Statistics class, the histogram...
2. According to survey data collected from 500 students in a
recent Statistics class, the histogram for the number of hours of
sleep they typically got per night is close to the normal curve
with an average of 6.5 hours and a SD of 1.4 hours.
a) Find percentage of students who sleep between 7 and 8
hours
b) A student who sleeps 7 hours per night is at the _______th
percentile of the score distribution
c) Find the first...
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 university found that 20% of its students withdraw without completing the introductory statistics course. Assume...
A university found that 20% of its students withdraw without
completing the introductory statistics course. Assume that 20
students registered for the course.
If required, round your answers to four decimal places.
a. Compute the probability that 2 or fewer will
withdraw.
b. Compute the probability that exactly 4 will
withdraw.
c. Compute the probability that more than 3
will withdraw.
d. Compute the expected number of
withdrawals.
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...
Each year about 1500 students take the introductory statistics course at a large university. This year...
Each year about 1500 students take the introductory statistics
course at a large university. This year scores on the final exam
are distributed with a median of 74 points, a mean of 70 points,
and a standard deviation of 10 points. There are no students who
scored above 100 (the maximum score attainable on the final) but a
few students scored below 20 points. a.Is the distribution of
scores on this final exam symmetric, right skewed, or left skewed?
b.Would...
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- There are a large number of tasks involved in information technology and programming, and many of...
- Using one quantitative and one qualitative health policy research method described in this chapter, design a...
- What is the Rawls' solution to the age-old question of social (economic / distributive) justice?...
- St. Johns River Shipyards' welding machine is 15 years old, fully depreciated, and has no salvage...
- The following information is available for Robstown Corporation for 20Y8: Inventories January 1 December 31 Materials...
- /* Complete the TO DO comments below */ window.onload = function() { /* TODO add a...
- Trevor Price bought 10-year bonds issued by Harvest Foods five years ago for $4,532.35. The bonds...
ADVERTISEMENT