GAC010 Asssment Event 2: Project-Statistics
Statistics
Student Name: Lucy
cnn新闻Teacher Name:
Due Date: 14/10/2013
Word Count:407
1.Create a dot plot to e the distribution of the data.
2.List data in order
157,160,162,165,166,167,167,167,168,169,170,171,172,173,174,174,176,178,180,182
国土安全第三季3.What’s the Range of data:
Range=Highest-Lowest=182-157=25(cm)
4.Plot the data in a Histogram and describe the distribution
Symmetrical distribution
5.Create a Cumulative frequency curve and describe its shape
S-shaped curve
6.U the ogive to estimate the median and quartiles.
1st quartile:
Q1=164.5cm
Median:
=167.5cm
3rd quartile:
Q3=171.5cm
7.What is the inter-quartile range?
Inter-quartile range:
IQR=Q3-Q1=171.5-164.5=7cm
8.Box plot
9.Find the mean and standard deviation (sd).
==169.9cm
==6.31
10.Calculate the Pearson measure of Skewness (modal version), and the Quartile measure of skewness. Are they good indicators of skew in the data? Give reasons for your answer.
Mode=167cm
headphone是什么意思Pearson Skeweness==irish=0.460
Quartile Skewness===1
Reason: Not a good indicator, from the box plot, it is symmetrical distribution. The result should near to 0
11.Which of the three measures of central tendency (mean, median, mode) is the best choice for this data? Give a reason for your answer.
I think mean can be the best choice. Becau from mean I can e the average heights of the data and in the normal curve mean is in the middle.
12.What are (mean – 1 sd) and (mean + 1 sd)? What percentage of the data is between them?
cm
cm
There are 14 data between 163.6 and 176.21
The percentage of the data: 14/20=70%
13.amissWhat are (mean – 2 sd) and (mean +2 sd)? What percentage of the data is between them?
=169.9-12.62=157.28cm
=169.9+12.62=182.52cm
There are 19 data between 157.28 and 182.52
The percentage of the data: 19/20=95%
14.What are (mean – 2 sd) and (mean +2 sd)? What percentage of the data is between them?
There are 20 data
The percentage of the data: 20/20=100%
瞬息万变15.Find the value in the data that is clost to z = 0.5.
Z=
digital playgroundX=0.5*6.31+169.9=173.1cm
16.There is one data between z= -0.5 and 0.5
Z= X=Z=-0.5*6.31+169.9=166.7cm
X=Z𝜎+𝜇=0.5*6.31+169.9=173.0cm
日文翻译The percentage of the data:
9/20=0.45秃的意思
17.The middle 50% of the data
So X
Z==
