We consider data collected from the donor database of Blood Transfusion Service Center in Hsin-Chu City in Taiwan. The center passes their blood transfusion service bus to one university in Hsin-Chu City to gather blood donated about every three months. The current assignment involves data collected on a random sample of 748 donors. The data was obtained from theUCI Machine Learning Repository. This data was assembled by Prof. I-Cheng Yeh.

The file"transfusion.csv"contains the data.The file can be downloaded from MATH 1281 Data Files in the course page for MATH 1281. The file contains 5 variables:

• recency= The number of months since the last donation. (numeric)
• frequency= The total number of donations. (numeric)
• monetary= Total blood donated (in c.c.). (numeric)
• time= The number of months since the first donation. (numeric)
• march2007= An indicator. Indicates those that donated blood in March, 2007. (factor)

In this assignment we consider the variablesfrequencyandmonetary.

Estimating Parameters

In Tasks 4-6 you are asked to estimate the expectation and standard deviation of the variablefrequency. An estimator is used to estimate the expectation. This estimator has a standard deviation. You are required to estimate this standard error, which is the standard deviation of the estimator. You are required to describe which estimator was used for each estimation task.

So far, I'm stuck on task 6, and I got this:

Estimating Parameters:

4. The estimated value of the expectation of the measurement "frequency" is: 5.515.

> mean(dataset$frequency)

[1] 5.514706

Which means that it is expected that, on average, one donor donates blood about 5.5 times in about three months.

5. The estimated value of the standard deviation of the measurement "frequency" is: 5.839.

> sd(dataset$frequency)

[1] 5.839307

6. The estimated value of the standard deviation of the estimator that produced the estimate in 4. is:_____.

I don't understand what is expected of me at this point. Moreover, I'm not entirely sure if my answers are correct. They seem to be correct, but I'm afraid I'm not on the right track.