The student will calculate confidence intervals for means when the population standard deviation is known.
Given
The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students.
(
(External Link)
Let
the age of a Winter Foothill College student
Calculating the confidence interval
30.4
=
25
15=(insert symbol here)
Define the Random Variable,
, in words.
=
the mean age of 25 randomly selected Winter Foothill students
What is
estimating?
Is
known?
yes
As a result of your answer to (4), state the exact distribution to use when calculating the Confidence Interval.
Normal
Explaining the confidence interval
Construct a 95% Confidence Interval for the true mean age of Winter Foothill College students.
How much area is in both tails (combined)?
0.05
How much area is in each tail?
0.025
Identify the following specifications:
lower limit =
upper limit =
error bound =
24.52
36.28
5.88
The 95% Confidence Interval is:__________________
In one complete sentence, explain what the interval means.
Discussion questions
Using the same mean, standard deviation and level of confidence, suppose that
were 69 instead of 25. Would the error bound become larger or smaller? How do you know?
Using the same mean, standard deviation and sample size, how would the error bound change if the confidence level were reduced to 90%? Why?
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
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Source:
OpenStax, Collaborative statistics: custom version modified by r. bloom. OpenStax CNX. Nov 15, 2010 Download for free at http://legacy.cnx.org/content/col10617/1.4
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