×
Didn't find what you were looking for?
Ask a question
Home
Take a Tour
Study Tips
Help Pages
Contact Us
Gallery
Recently Added
Videos
Search
Blogs
Dictionary
Add New Word
Random Term
Recent Changes
Resource Library
Share Your Resources
Recently Added
Search
Forum
Ask a Question
Log In
Log In
Forgot your password?
Sign Up
your
homework help
forum
Forum
Search
Advanced Search
Image Gallery
Resource Library
Topics
Unresolved Questions
Discussions
Trending
Recent Posts
Chat
Subjects
Get unlimited homework help with our free online study community
More
Q & A Board
Entire Website
Gallery
Resource Library
Dictionary
Blogs
Search through 1.7M homework questions
Unresolved Questions
•
Discussions
•
Recent
Top Posters
Since Sunday
j
22
22
i
19
a
18
z
18
m
17
D
17
D
16
j
16
K
16
s
16
a
16
Home
Q & A Board
Science-Related Homework Help
Mathematics
Statistics and Probability
Print
New Topic
Grade school students, especially the ones in higher grades, tend to spend a lot of time on the ...
Tyrib
Tyrib
wrote...
Go to Answer
Posts:
688
Rep:
0
0
A year ago
A year ago
Grade school students, especially the ones in higher grades, tend to spend a lot of time on the ...
Grade school students, especially the ones in higher grades, tend to spend a lot of time on the computer already. The average amount of time 4th grade boys spend on the computer is 5 hours per week, with a standard deviation of 1 hour. For 5th grade boys the average increases to 7 hours per week with a standard deviation of 1.5 hours. Random sample of 20 4th grade students and 25 5th grade students are to be selected. What is the expected value for the difference in sample means (5th 4th grade)?
Q. 2
An ESP experiment is done in which a participant guesses which of 4 cards the researcher has randomly picked, where each card is equally likely. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that the subject has ESP and can guess at higher than the chance rate. Which of the following would be a Type 1 error in this situation?
a. Declaring somebody has ESP when they actually don't have ESP.
b. Declaring somebody does not have ESP when they actually do.
c. Analyzing the data with a confidence interval rather than a significance test.
d. Making a mistake in the calculations of the significance test.
Q. 3
Many adults complain they do not get enough sleep at night. What happens when these adults have children? Independent random samples of 150 adults who do not have children in the house and 130 adults who do have children in the house are selected. The average amount of sleep the adults without children had was 7.1 hours with a standard deviation of 0.7 hours. The average amount of sleep the adults with children had was 6.5 hours with a standard deviation of 0.8 hours. What is the estimate for the standard deviation of the sampling distribution of the difference in sample means?
Q. 4
An ESP experiment is done in which a participant guesses which of 4 cards the researcher has randomly picked, where each card is equally likely. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that the subject has ESP and can guess at higher than the chance rate. The subject actually gets 70 correct answers. Which of the following describes the probability represented by the p-value for this test?
a. The probability that the subject has ESP
b. The probability that the subject is just guessing.
c. The probability of 70 or more correct guesses if the subject has ESP.
d. The probability of 70 or more correct guesses if the subject is guessing at the chance rate.
Q. 5
Many adults complain they do not get enough sleep at night. What happens when these adults have children? Independent random samples of 150 adults who do not have children in the house and 130 adults who do have children in the house are selected. The average amount of sleep the adults without children had was 7.1 hours with a standard deviation of 0.7 hours. The average amount of sleep the adults with children had was 6.5 hours with a standard deviation of 0.8 hours. What is the estimate for the difference in mean hours slept at night between adults with and adults without children?
Q. 6
An ESP experiment is done in which a participant guesses which of 4 cards the researcher has randomly picked, where each card is equally likely. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that the subject has ESP and can guess at higher than the chance rate. What is the correct statement of the null hypothesis that the person does not have ESP?
a. H0: p = 0.5
b. H0: p = 4/200
c. H0: p = 1/4
d. H0: p > 1/4
Q. 7
College students spend a lot of their money, not on things they would like to buy, but on text books. College text books have increased in price significantly over the past few years. The amount students spend on text books is approximately normally distributed with a standard deviation of 50 . The average amount spent on books each semester is 340 for undergraduate students and 250 for graduate students. Independent random samples of 100 undergraduate students and 80 graduate students are to be selected and the average amount they spent on text books last semester is to be compared (undergraduate graduate). What is the probability that the undergraduate students in the sample spent more on books, on average, than the graduate students in the sample?
Q. 8
Past data indicates an 80 (0.8) success rate in treating a certain medical problem. A new treatment is used on 100 patients in a clinical trial. It is successful in 87 (0.87) of the cases. What is the value of the z-score that can be used to test the null hypothesis that the success rate is 80?
a. 7
b. 2
c. 1.75
d. -1.75
Read 17 times
1
Reply
Report
Replies
Answer verified by a
subject expert
kheycee
kheycee
wrote...
#1
Answer Link
Posts:
383
Rep:
0
0
A year ago
A year ago
Answer to #1
2 hours
Answer to #2
A
Answer to #3
0.0905 hours (roughly 5 minutes)
Answer to #4
D
Answer to #5
0.6 hours (36 minutes)
Answer to #6
C
Answer to #7
< 0.0001
Answer to #8
C
1
Report
Related Topics
Solved
In high school, girls tend to __________.
Solved
High school students spend twice as much time with ________ as with other important people in their
Solved
Average grade-school youngsters spend more time each week in school than they do watching ...
Solved
Ms. Aguilar's third-grade students enjoy art and spend much of their free time drawing and ...
Solved
We generally expect students who spend more time studying economics to earn higher grades, ceteris ...
Solved
Students with an external locus of control tend to earn higher grades.
Solved
At Henderson Elementary School, grades are not assigned to kindergarten or first-grade students; ...
Solved
Which of the following is not true of motivated students?
Show More
New Topic
Quick Reply
[center][color=gray]Please [b]login or register[/b] to leave a reply[/color][/center]
Explore
Post your homework questions and get free online help from our incredible volunteers.
Why Sign Up?
Learn More
Improve Grades
Help Others
Save Time
Accessible 24/7
126 People Browsing
Start New Topic
Take the Tour
Study Tips
Browse by Textbook
New
Your Opinion
Do you believe in global warming?
Completely
To a large extent
Needs more research
I'm skeptic
Entirely a myth
Votes: 186
Previous poll results:
Which 'study break' activity do you find most distracting?
Related Images
114
142
40
Latest Blogs
Are vaccines safe for children?
Where is our third eyelid?
This Island has More Sheep than Humans
Canada's only desert
Watch this 1940's Disney Cartoon Made to Fight Malaria
Ready to ask a question on
Biology Forums
?
Try it out
▸
Tools for service design include all of the following EXCEPT:
–
Business
Charles is nine years old. Until he was six, he lived with just his mother and had no contact with ...
–
Education Studies
Write an essay about diversity in parent-child interactions across cultures. In your answer, ...
–
Education Studies
Which one of the following statements most accurately represents the research findings regarding ...
–
Education Studies
What are the contributions of non-maternal family members to a child's development? In your answer, ...
–
Education Studies
What is the difference between feelings of competence and feelings of social acceptance? Can a child ...
–
Education Studies
Agnes is a seven-year-old who is currently homeless. She and her parents, with whom she is securely ...
–
Education Studies
In cultures where infant mortality is high, infants are:
–
Education Studies
Children who are placed in foster care with members of their own family are more likely than ...
–
Education Studies
Pathologic basis of disease - [Medium]
–
Test-Bank and Note Requests
Loading...