MATH 221A - L10 HK Quiz. Answers Provided.

Information



The heights
of young
adult females
in the United
States are
said to have
a population
standard
deviation
of σ=2.6
{"version":"1.
1","math":"\
sigma =
2.6"} inches.
A sample
was taken
of n=85{"
version":"1.1"
,"math":"n =
85"} young
adult females
at BYU-I and
the mean
computed to
be x¯=6
5.4{"versio
n":"1.1","mat
h":"\bar{x} =
65.4"} inches
.




Use this
information
to answer
the next 9
questions.


Question 1 point

What is the
point
estimate for
the
population
mean?
Round your
answer to 1
decimal
place. (Exam
ple: 24.7)



Answer:
65.4
Question 2 point

, What is the
margin of
error for a
95%
confidence
interval of
the
population
mean?
Round your
answer to 3
decimal
places. (Exa
mple:
24.735)



Answer:
0.553
Information


Compute the
95%
confidence
interval of
the mean
height.
Round your
answers to 3
decimal
places. You
should get
an interval of
the form
(lower
bound, upper
bound).
You'll enter
your
answers in
the next two
problems.




Question 3 0..5 points

What is the
lower bound
of the 95%
confidence
interval for
the mean
height?


Answer:
64.847
Question 4 0..5 points

What is the
upper bound
of the 95%
confidence
interval for
the mean
height?