# Descriptive Statistics

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ALL VARIABLE NAMES ARE REFERENCES TO THE VARIABLES OF THE DATA. SELECT THE SAMPLES FROM THE POPULATION. ( Population of 1 through 74, which is in the EXCEL FILE attachment.)

(1) Using the size of the group as the sample size, select 10 different random samples of the same size. To do this, number each person in the population, 01 through 74, and then use sampling in Data Analysis, or PHStat, to generate a list of numbers, The group's size is total of 10 people ( 1 through 10 in EXCEL FILE attachment) and that is the sample. The subjects corresponding to the numbers listed are the samples.For instance,if there is a sample with ten subjects and the computer generates 72,41,58,47,22,

25,05,13,64 and 32, those are the subjects in the first sample. The sample consists of the whole line of information for person numbered 41, person numbered 22, etc.

A. Select one of the continuous variables (ex.GPA,MIN TO COLLEGE listed in the excel file.So, basically it has to be a whole number.) and use descriptive statistics for that variable or use the function button on the main menu to calculate the mean, median and standard deviation of each sample. Then calculate the mean of all the means, average median and average standard deviation for all 10 samples. Now,you have one overall mean of all samples, one median and one standard deviation. i need help with this sub question.

B. Compare and analyze the population parameters for that variable (mean, median and standard deviation) with the group ( Number 1 through 10 (people) in the "EXCEL FILE" ATTACHMENT is the GROUP.) and the results of QUESTION A, that is all the random samples. COMPARE the class, the group and the results of A. I don't understand sub questionA, so i can't come up with an answer for this one. so i really need help with this.

C. Make a new sheet of the population with columns for subject number, ID and the variable you are analyzing. Please help me with this. So, i could figure out how to do similar question like this one.

D.

a. One sheet with all the samples listed separately. Two columns for each sample: a column with the ID number, and a column of appropriate data at the end of which is that sample's mean, median and standard deviation.

b. The comparisons and analysis (typed ) of the similarities and differences among the population, the 10 samples and the group ( 1 through 10 people in EXCEL FILE is the GROUP ). Use graphs, dot-and-whisker, etc. to compare them.

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##### Solution Summary

ALL VARIABLE NAMES ARE REFERENCES TO THE VARIABLES OF THE DATA. SELECT THE SAMPLES FROM THE POPULATION. ( Population of 1 through 74, which is in the EXCEL FILE attachment.)

(1) Using the size of the group as the sample size, select 10 different random samples of the same size. To do this, number each person in the population, 01 through 74, and then use sampling in Data Analysis, or PHStat, to generate a list of numbers, The group's size is total of 10 people ( 1 through 10 in EXCEL FILE attachment) and that is the sample. The subjects corresponding to the numbers listed are the samples.For instance,if there is a sample with ten subjects and the computer generates 72,41,58,47,22,

25,05,13,64 and 32, those are the subjects in the first sample. The sample consists of the whole line of information for person numbered 41, person numbered 22, etc.

A. Select one of the continuous variables (ex.GPA,MIN TO COLLEGE listed in the excel file.So, basically it has to be a whole number.) and use descriptive statistics for that variable or use the function button on the main menu to calculate the mean, median and standard deviation of each sample. Then calculate the mean of all the means, average median and average standard deviation for all 10 samples. Now,you have one overall mean of all samples, one median and one standard deviation. i need help with this sub question.

B. Compare and analyze the population parameters for that variable (mean, median and standard deviation) with the group ( Number 1 through 10 (people) in the "EXCEL FILE" ATTACHMENT is the GROUP.) and the results of QUESTION A, that is all the random samples. COMPARE the class, the group and the results of A. I don't understand sub questionA, so i can't come up with an answer for this one. so i really need help with this.

C. Make a new sheet of the population with columns for subject number, ID and the variable you are analyzing. Please help me with this. So, i could figure out how to do similar question like this one.

D.

a. One sheet with all the samples listed separately. Two columns for each sample: a column with the ID number, and a column of appropriate data at the end of which is that sample's mean, median and standard deviation.

b. The comparisons and analysis (typed ) of the similarities and differences among the population, the 10 samples and the group ( 1 through 10 people in EXCEL FILE is the GROUP ). Use graphs, dot-and-whisker, etc. to compare them.

###### Education

- BSc , Wuhan Univ. China
- MA, Shandong Univ.

###### Recent Feedback

- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"

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