1.) A social service agency plans to conduct a survey to determine the mean income of its clients. You sample a random and representative sample of 250 agency clients, and ask them their annual income (in actual dollar amounts). First, you provide information of the dispersion and variability of incomes (both including and excluding outliers). Second, you provide a visual of the sample income data. Third, you provide an interval estimate of the population mean.

What is the sample:

What is the population:

Is it descriptive or inferential

What are the variable(s) involved:

What are the level(s) of measurement:

What are the independent & dependent variable(s) (if any):

What is the statistical analysis of this question:

2.) It is known that, nationally, doctors working for health maintenance organizations (HMOs) average 13.5 years of experience in their specialties, with a standard deviation of 7.6 years. The executive director of an HMO in a western state is interested in determining whether or not its doctors have less experience than the national average. The company statistician draws a random and representative sample of 150 doctors from that HMO and crunches the statistics.

What is the sample:

What is the population:

Is it descriptive or inferential

What are the variable(s) involved:

What are the level(s) of measurement:

What are the independent & dependent variable(s) (if any):

What is the statistical analysis of this question:

3.) Research indicates that charitable giving is more common among older adults, although increased giving by Millennials is part of a growing trend. You decided to examine this trend more in-depth. You sample a random and representative group of 500 adult residents in Lancaster County. For each respondent, you ask them three questions: (1) whether they fall in the age group of 30-39 years old or 50-59 years old; (2) the total number of donations they gave in the last calendar year; (3) the total amount of money they donated in the last calendar year. You then compare the two age groups against each other, hoping to make some inferences as to whether, on average, Millennials are more charitable.

What is the sample:

What is the population:

Is it descriptive or inferential

What are the variable(s) involved:

What are the level(s) of measurement:

What are the independent & dependent variable(s) (if any):

What is the statistical analysis of this question: