Assignment Task
Task
Please turn in a professionally organized report document that includes detailed calculations, organized output, and sufficient statistical interpretations. Formula and equation need to be edited with Word documents.
Format of the Case Study Report:
(1) Your name and e-mail address.
(2) Give a title for your report, and write an introduction / purpose of the study.
(3) Data source and description
Give a general description of the dataset provided.
In your description, you need to include the definition of the data and data source (URL link if it comes from a public website), or references of the dataset (such as: provided by DS303 course content.)
Total number of observations is
Total number of variables is
Any other details/descriptions you would like to add.
(4) Statistical Analysis
Perform the following analysis, copy and paste the relevant computer printouts and graphs to the report, and be sure to provide comments and descriptions. Open the excel data file Bears.xlsx. Provide a description of the variables that are included in the data file. Explain the variables and analyze the data types of the variables. Get a Histogram for the target variable Weight using Excel. Provide comments on the four key features (shape, center, spread, outlier) of the Histogram. Do further graphical explorations on the dataset. Provide a single graph containing side-by-side boxplot that show the Weight of bears by Sex. Describe this boxplot. Is there any difference of weight by different sex of bears? If so, illustrate some evidences from the graph. If not, provide comments. Provide descriptive statistics of variable Weight. For example: mean, median, range, IQR, standard deviation, variance, and five number summaries. Provide similar descriptive statistics for the other quantitative variables and summarize the statistics in a table. Generate a 95% confidence interval for the mean of the variable Weight. You will need to estimate the sample standard deviation and construct a 95% t confidence interval. Please edit the formula and equation in work. Remember to interpret your result after the calculation. Perform a hypothesis testing, at significance level of 0.05, for the mean of the variable Weight. H0: ?=190 lbs vs Ha: ??190 lbs. Please conduct a two-tail test against the constant 190 lbs. Researchers are interested to know if the average weight of bears is significantly different from 190 lbs or not. Based on the information, this should be a t test statistic. Show detailed steps. State your decision rules and conclusion.
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