Statistics Midterm Essay

1626 Words Sep 21st, 2012 7 Pages
MM207 Statistics

Unit IV Mid Term Project

1. In the following situation identify the implied population.

A recent report on the weekly news presented the findings of a study on the effectiveness of Onglyza, along with diet and exercise, for treating diabetes.

According to Bennett (2009), a population is defined as “the complete set of people or things being studied” in a statistical study. Given that the information is in relation to finding the success of a drug used to care for diabetes, the population would be individuals who experience diabetes. Therefore, the implied population is the entire individual’s who diabetics are. Individuals who are diabetics are those who were used to test the effectiveness of Onglyza,
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Then using Stat Crunch compute the actual standard deviation. Compare the results.

a) Does the range rule of thumb overestimate or underestimate the standard deviation for number of credit hours?

Summary statistics for Q6 How many credit hours are you taking this term? Column | n | Mean | Variance | Std. Dev. | Std. Err. | Median | Range | Min | Max | Q1 | Q3 | Q6 How many credit hours are you taking this term? | 163 | 11.03681 | 8.270242 | 2.8758028 | 0.22525026 | 11 | 19 | 4 | 23 | 10 | 12 |

Range rule of thumb: (23-4)/4=4.75
Standard Deviation: 2.8758028
I am going to go with that the range rule of thumb underestimates the standard deviation for the number of credit hours.

b) Does the range rule of thumb overestimate or underestimate the standard deviation for shoe sizes of females?

Summary statistics for Q4 What is your shoe size?: Group by: Gender Gender | n | Mean | Variance | Std. Dev. | Std. Err. | Median | Range | Min | Max | Q1 | Q3 | Female | 134 | 8.2574625 | 1.7997559 | 1.3415499 | 0.115892254 | 8 | 7 | 5 | 12 | 7 | 9 |
Range Rule of Thumb: (12-5)/4=1.75
Standard Deviation: 1.3415499

I would say that the Range Rule of Thumb overestimates the Standard Deviation. But then again I am still really unclear about how the Rule of Thumb really works still.

C.) How

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