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Assignment 3 inferential statistics analysis and writeup umuc

14/10/2021 Client: muhammad11 Deadline: 2 Day

Inferential Statistics Analysis And Writeup

STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup - Instructions Page 1 of 5

STAT200 Introduction to Statistics

Assignment #3: Inferential Statistics Analysis and Writeup

Purpose:

The purpose of this assignment is to develop and carry out an inferential statistics analysis plan and

write up the findings. There are two main parts to this assignment:

● Part A: Inferential Statistics Data Plan and Analysis

● Part B: Write up of Results

Part A: Prepare Data Plan, Analyze Data, and Complete Part A of the Assignment #3 Template

➢ Task 1: Select Variables. Review the variables you used for assignments #1 and #2. Select your

qualitative socioeconomic variable as your grouping variable and the two expenditure variables

from the variables used in these previous assignments. Fill in Table 1: Variables Selected for

Analysis with name, description, and type of variable (i.e., qualitative or quantitative).

➢ Task 2: Select and Run a One Sample Confidence Interval Analysis. For one expenditure

variable, select and run the appropriate method for estimating a parameter, based on a statistic

(i.e., confidence interval method). Complete Table 2: Confidence Interval Information and

Results, which follows the format outlined by Kozak and the course’s problem-solving approach,

including:

○ Random variable stated in words

○ Confidence interval method, including rationale and assumptions

○ Method used for analyzing data (i.e., web applets, Excel, TI calculator, etc.).

○ Results obtained

○ Interpretation

➢ Task 3: Select Two Sample Hypothesis Test. Using the second expenditure variable (with the

socioeconomic variable as the grouping variable), select and run the appropriate method for

making decisions about two parameters relative to observed statistics (i.e., two sample

STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup - Instructions Page 2 of 5

hypothesis test method). Complete Table 3: Two Sample Hypothesis Test Analysis, which

follows the format outlined by Kozak and the course’s problem-solving approach, including:

○ Hypotheses (null and alternative).

○ Two sample hypothesis testing method, including rationale and assumptions

○ Method used for analyzing data (i.e., web applets, Excel, TI calculator, etc.).

○ Results obtained.

○ Interpretation (i.e., Reject the null hypothesis OR Fail to reject null hypothesis)

Step 2: Write Up Results and Complete Part B of the Assignment #3 Template

For this 1 to 2 page section, refer to the inferential statistics data plan and computations done for Part A

of this assignment. Address the following area:

➢ Introduction. Based on the scenario you submitted for the second assignment, provide a brief

description of scenario, including the variables that were used in this analysis. Include a

completed “Table 1: Variables Selected for Analysis to show the variables you selected for

analysis.

➢ Data Set Description and Method Used for Analysis. Briefly describe the data set, using

information provided with data set and write up in Assignment #2. Also describe what

method(s) (i.e., free web applets, Excel, TI Calculator) you used to analyze the data.

➢ Results. In this section, you will report the results of your inferential statistics data analysis.

For the Confidence Interval Analysis, write one paragraph that includes:

o Statistical method used, including rationale and whether assumptions were met.

o Statistical Interpretation. The statistical interpretation is that the confidence interval

has a probability (1−α, where α is the complement of the confidence level) of containing

the population parameter.

o Real World Interpretation. Explain the results in everyday language. Recommend

reviewing the text and information from the classroom for examples on how to report

results in everyday language.

STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup - Instructions Page 3 of 5

For the Two Sample Hypothesis Test Analysis, write one paragraph that includes:

o Hypotheses that were assessed. See below table for example format:

Examples Format for Writing Null and Alternative Hypotheses, in Words

Null Hypothesis: There is no significant difference in [insert variable name] between [insert group 1 name] and [insert group 2 name] households.

Alternative Hypothesis:

➢ For two-tailed (≠): There is a significant difference in [insert variable name] between [insert group 1 name] and [insert group 2 name] households.

➢ For one-tailed (>): [Insert group 1 name] has statistically significantly higher [insert variable name] than [insert group 2 name].

➢ For one-tailed (<): [Insert group 1 name] has statistically significantly lower [insert variable name] than [insert group 2 name].

o Statistical method used, including rationale and whether assumptions were met. See

below table for example format:

Example Format for Writing Statistical Method with Rationale

To determine whether the there was a difference in [insert household expenditure]

between [insert names of two groups), a [insert name of hypothesis test used] was

used. It was the appropriate statistical method, because [insert rationale]. The

assumptions were assessed [insert information about the assumptions assessed and

whether they were met].

o Conclusion from the Results. This is where you state whether to reject Ho or fail to

reject Ho including the p-value that was obtained. The rule is: if the p-value < α, then

reject Ho. If the p-value ≥α, then fail to reject Ho.

STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup - Instructions Page 4 of 5

o Real World Interpretation. Explain, in everyday language, the results. If any of the

assumptions were not met, describe how it might affect conclusions. Address issues of

Type I and/or Type II Error, where appropriate. Recommend reviewing the text and

information from the classroom for examples on how to report results in everyday

language.

➢ Discussion– Write one paragraph that summarizes the results of your findings and how they

may be helpful to the person described in the scenario, when making a household budget.

Assignment Submission: Name the file that contains your completed Assignment #3 Inferential

Statistics Analysis - Template using the following format: “Assignment3-StudentLastName.” Submit it

via the Assignments area in the LEO classroom in the “Assignment #3: Inferential Statistics Analysis and

Writeup” folder.

Grading Rubric for Assignment #3

Part A: Prepare Data Plan, Analyze Data, and Complete Part A of the Template

Selection of variables and completion of table 10%

Selection and Calculation of Confidence Interval Analysis: ● Selection of Appropriate Test and Rationale ● Assumptions ● Method Used and Calculation ● Conclusion ● Statistical Interpretation

20%

Selection and Calculation of Two Sample Hypothesis Test: ● Research Question and Hypotheses ● Selection of Appropriate Test and Rationale ● Assumptions ● Method Used and Calculation ● Conclusion, including p-value ● Statistical Interpretation

20%

Part B: Write Up of Results

Introduction and Description of Data Set 5%

STAT200: Assignment #3 - Inferential Statistics Analysis and Writeup - Instructions Page 5 of 5

Confidence Interval. Summarized: ● Statistical method used, including rationale and whether assumptions were met

● Statistical Interpretation

● Real World Interpretation.

15%

Two Sample Hypothesis Test. Summarized:

● Hypotheses

● Statistical method used, including rationale and whether assumptions were met.

● Conclusion from the Results.

● Real World Interpretation.

15%

Discussion 5%

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