Download By: Vanessa Miranda, Yesenia Flores, and Pedro Huerta Period 6

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8.0: Students organize and describe distributions of data by
using a number of different methods, including frequency
tables, histograms, standard line and bar graphs, stem-andleaf displays, scatter plots, and box-and-whisker plots.
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17.0 Students determine confidence intervals for a simple
random sample from a normal distribution of data and
determines the sample size required for a desire margin of
error.
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18.0 Students determine the p-value for a statistic for a
simple random sample from a normal distribution.
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We believe that the average minutes that
students from Century High School take to
get ready is 15 minutes.
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We used Stratified Sampling to gather our
information/data. We asked boys and girls
from each grade at Century High School how
long do they take to get ready for school. We
asked 40 students, 5 boys and 5 girls from
each grade.
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Time in minutes
45,50,60,1:30,1:15,20,30,25,30,30,30,30,30,
30,45,45,30,10,30,20,50,15,20,30,45,25,25,45,
30,20,15,10,15,20,60,5,30,35,20,10,25
How long do you take to get ready?
25
number Of Students
20
15
10
5
0
12.05
26.2
40.4
54.55
68.7
Number Of Minutes
82.9
97.05
111.2
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From our survey, Students mean time to get
ready is 31.625, with a sample standard
deviation 18.095
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95% Confidence Interval
Z-Interval
(26.017, 32.477)
We are 95% confident mean commute time
for all students to get ready are between
26.017 to 32.477 minutes.
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Test Hypothesis
We believe that the average minutes that
students from Century High School take to
get ready is 15 minutes.
45,50,60,1:30,1:15,20,30,25,30,30,30,30,30,
30,45,45,30,10,30,20,50,15,20,30,45,25,25,45,
30,20,15,10,15,20,60,5,30,35,20,10,25
At 5% level of significance, we failed to reject.
There is enough evidence to support our
claim.
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We hypothesized that century students time
in minutes to get ready was an average of 15
minutes. In our survey of 40 students, we find
the sample mean of with a standard deviation
of 18 minutes. We concluded that the
population mean for all students is between
26.017 to 32.477 minutes with a 95%
confident. We test our initial hypothesis
with5% level of significance, and confirm our
hypothesis is correct.
 Our Sample mean is 18 minutes, and we are 95% confidence level for the
population mean is between 26.017 to 32.477 minutes. The marginal error is
about 6 minutes.
 our sample error is due to possible under representation of the population.
Some students might have had special occasions and that’s the reason they
have to take more time to get ready. While other students were just lazy like
Pedro Huerta. Some students might of lie on our survey and just might of said a
round number that just came to their head.