3E1. The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. What is an efficient, unbiased point estimate (average Mean) of the number of books checked out each day at the Library of Congress? (a)740 (B)830 (7)920 ()1660 (x)180 O
3E1. The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. What is an efficient, unbiased point estimate (average Mean) of the number of books checked out each day at the Library of Congress? (a)740 (B)830 (7)920 ()1660 (x)180 O
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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t6 solve both please
Transcribed Image Text:COOCOOCOOCOOCOO
3E1. The head librarian at the Library of
Congress has asked her assistant for an interval
estimate of the mean number of books checked out
each day. The assistant provides the following
interval estimate: from 740 to 920 books per day.
What is an efficient, unbiased point estimate
(average Mean) of the number of books checked
out each day at the Library of Congress?
(a) 740 (B)830 (7)920 ()1660 (x)180
COOCOOOOOOOOOO
3E2.A major department store chain is interested
in estimating the mean amount its credit card
customers spent on their first visit to the chain's
new store in the mall. Fifteen credit card accounts
were randomly sampled and analyzed with the
following results: x= 50.50 Dollars and s= 20.
Construct a 95% confidence
interval
(1=x-
,B=x+fan
mean amount its credit card customers spent on
their first visit to the chain's new store in the mall
assuming that the amount spent follows a normal
distribution. (Minimum up to Four decimal Places)
Conf. Int.:xt/2
(4=
A=x-tan
(+₁);a=0.
B =
for the
= 0.05;2=2.1448
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