Question
In: Statistics and Probability
A library system lends books for periods of 21 days. This policy is being reevaluated in...
A library system lends books for periods of 21 days. This policy is being reevaluated in view of a possible new loan period that could either lengthen or shorten the 21-day period. To aid in this decision, book-lending records were consulted to determine the loan periods actually used by the patrons. A random sample of eight records revealed that following loan periods in days: 21, 15, 12, 24, 20, 21, 13, and 16. Do the actual loan periods differ from 21 days?
a. State your null and alternative hypothesis.
b. Conduct the appropriate test and state your conclusion. c. What
is the 95% confidence interval? (If applicable)
Solutions
orchestra answered 1 year agoRelated Solutions
Create a library system Description: Library system is aimed to computerize the library management operations. Example,...
Create a library system
Description:
Library system is aimed to computerize the library management
operations. Example, registring a student,
issuing a book,Handling book returns,etc.
Required skill set: OOP,Arrays
Use File handling if necessary
The language is visual studio c++
The librarian at the local school claims that, on average, the books in the library are...
The librarian at the local school claims that, on average, the
books in the library are more than 20 years old. To test this
claim, a student takes a sample of 30 books, and records the
publication date. The sample of 30 books produce an average age of
M = 23.86 years with a standard deviation of 8.82 years. Conduct a
one-tailed test with α = .01 to determine whether the average age
of the library books is significantly greater...
The librarian at the local elementary school claims that, on average, the books in the library...
The librarian at the local elementary school claims that, on
average, the books in the library are more than 20 years old. To
test this claim, a student takes a sample of n=30 books and records
the publication date for each. The sample produces an average age
of M=23.8 years with a variance of s2 =67.5. Use this sample to
conduct a one-tailed test with α=.01 to determine whether the
average age of the library books in significantly greater than...
The director of library services at a college did a survey of types of books (by...
The director of library services at a college did a survey of
types of books (by subject) in the circulation library. Then she
used library records to take a random sample of 888 books checked
out last term and classified the books in the sample by subject.
The results are shown below.
Subject
Area
Percent of Books on
Subject in Circulation
Library on This Subject
Number of Books
in
Sample on This Subject
Business
32%
237
Humanities
25%
226
Natural...
The director of library services at a college did a survey of types of books (by...
The director of library services at a college did a survey of
types of books (by subject) in the circulation library. Then she
used library records to take a random sample of 888 books checked
out last term and classified the books in the sample by subject.
The results are shown below.
Subject
Area
Percent of Books on
Subject in Circulation
Library on This Subject
Number of Books
in
Sample on This Subject
Business
32%
288
Humanities
25%
223
Natural...
The director of library services at a college did a survey of types of books (by...
The director of library services at a college did a survey of
types of books (by subject) in the circulation library. Then she
used library records to take a random sample of 888 books checked
out last term and classified the books in the sample by subject.
The results are shown below.
Subject
Area
Percent of
Books on Subject in Circulation
Library on This Subject
Number of
Books in
Sample on This Subject
Business
32%
259
Humanities
25%
228
Natural...
The director of library services at a college did a survey of types of books (by...
The director of library services at a college did a survey of
types of books (by subject) in the circulation library. Then she
used library records to take a random sample of 888 books checked
out last term and classified the books in the sample by subject.
The results are shown below.
Subject
Area
Percent of Books on
Subject in Circulation
Library on This Subject
Number of Books
in
Sample on This Subject
Business
32%
249
Humanities
25%
225
Natural...
The director of library services at a college did a survey of types of books (by...
The director of library services at a college did a survey of
types of books (by subject) in the circulation library. Then she
used library records to take a random sample of 888 books checked
out last term and classified the books in the sample by subject.
The results are shown below.
Subject
Area
Percent of Books on
Subject in Circulation
Library on This Subject
Number of Books
in
Sample on This Subject
Business
32%
265
Humanities
25%
220
Natural...
Days are business days and a month has 21 such days. All stocks pay no dividends...
Days are business days and a month has 21 such days. All
stocks pay no dividends ?
Estimate a non-dividend-paying stock’s annualized volatility
(use 252 trading days) using its prices in the past nine
months.
Month Stock Price per share
1 80
2 64
3 80
4 64
5 80
6 100
7 80
8 64
9 80
Then, predict the value of the stock on the 10th business day of
the...
Go to a local library; collect a sample of books consisting of the ages of book...
Go to a local library; collect a sample of books consisting of
the ages of book (based on copyright dates). Plan and describe the
sampling procedure, then use the results to construct a confidence
interval estimate of the mean age of all books in the library.
Please, post and share your results with the class.
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