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# Module 3 SLP Math 201 (Math Problem Sample)

Instructions:

** Module 3 SLP Math 201**

Continuing with the data you collected in the Module 1 SLP, write a paper (1–3 pages) including all of the following content:

- Include your data from Module 1.
- Create a frequency distribution table for your data. You can use Excel
^{ }or Word. - Calculate the standard deviation.
- Calculate the variance.
- Is this a normal distribution? How do you know?
- What are the implications?

source..

Content:

Module 3 SLP Math 201

Name

Course

Instructor

Date

Data from Module 1

DayMinutes1352383494325406377388349451031 The data represents the time spent driving in the weekdays from home to work in the morning sessions and from work heading home during the evening to night sessions.

Frequency distribution for the data collected

35, 38, 49, 32, 40, 37, 38, 34, 45, and 31

CumulativeCumulativeTime DrivingFrequency Frequency PercentagePercentage31111010321210203413103035141040371510503827207040181080451910904911010100

Standard deviation and variance

DayMinutes (m)M-X(m-x)^2135-2.98.412380.10.0134911.1123.21432-5.934.815402.14.41637-0.90.817380.10.01834-3.915.219457.150.411031-6.947.61Total379284.9Sample Standard Deviation, s5.63Variance (Sample Standard), s231.66Population Standard Deviation, Ïƒ

5.34

Variance (Population Standard), Ïƒ2

28.49

Total Numbers, N

10

Sum:

379

Mean (Average)

37.9

The population standard deviation is 5.34 being the square root of 28.49 (284.9/10), with the variance the same as the standard deviation squared. However, the sample variance is 31.66 being 284.9/9 and the standard deviation is the square root of 31.65. The differences between the two arises since the sample size is small (n<30), and hence the sample variance is the sum of squared deviation divided by n-1. Typically, as the sample size increases the variance tends to get lower with more estimates. It is also easier to identify the odd observations when there is a larger sample as estimates provide a clearer picture on time spent driving.

Normal distribution

This is not a normal distribution since the mode, mean and median are different, and the computation of the standard deviation, variance and mean makes it easier to understand the distribution. In normally distributed data there is perfect symmetry since the mean mode and median are the same (Black, 2010). ...

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