(d) Write out a 90% confidence interval about µ. (e) Fill in the blanks to interpret the confidence interval. We are % confident that lies between and
(d) Write out a 90% confidence interval about µ. (e) Fill in the blanks to interpret the confidence interval. We are % confident that lies between and
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
Related questions
Question
part D E
Q4
How long is your commute to school? For a random sample 16 LaGuardia
students, the mean commute time was 33 minutes. The standard deviation for the
sample was 10 minutes. Answer the questions below to construct a 90% confidence
interval about the population mean, µ. Assume that student commute times are nor mally distributed.
(a) What are the values for the following variables?
- x =
- s =
- n =
- (degrees of freedom) df =
(b) What is the critical value, Tc corresponding to a 90% confidence level?
(c) Compute the margin of error,
Tc
s
√
n
=
(d) Write out a 90% confidence interval about µ.
(e) Fill in the blanks to interpret the confidence interval.
We are % confident that lies between and .
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