Drills with R on point estimates and confidence intervals

Provide in the plain text R commands that finds/solves the following:

A study investigates the distribution of annual income for heads of households living in public housing in Chicago. For a random sample of size 30, the annual incomes (in thousands of dollars) are in the Chicago data file.

Based on a descriptive graphic, describe the shape of the sample data distribution. Find and interpret point estimates of the population mean and standard deviation.

Construct a 95% confidence interval for , using R software.

The Anorexia data file contains results for the cognitive behavioral and family therapies and the control group. Using data for the 17 girls who received the family therapy:

Conduct a descriptive statistical analysis using graphs and numerical summaries.

Construct a 95% confidence interval for the difference between the population mean weight changes for the family therapy and the control.

Datasets needed are at Index of Datasets

Useful functions in R to solve problems in this assignment: read.table, hist, t.test