You have been asked to do an information guide or notebook as a reference for the county's mental health stakeholders to help them fully participate in decision-making. You will start the notebook this week with a fact sheet on basic statistical concepts. You will be adding to the notebook in Weeks 4 and 5.

The fact sheet, a crucial component of your information guide, will play a significant role in aiding the stakeholders' understanding of the needs assessments you will complete in Week 6, the program evaluation in Week 7, and the research proposal in Week 8.

Briefly 100 words define or explain critical statistical concepts. Although it may be tempting to quote the source, summarize or paraphrase responses directly. This is a better learning experience and demonstrates skills used in professional mental health. Include the following:

• Measurement scales
• Validity and reliability
• The relationship between validity and reliability
• Validity and reliability bias
• Descriptive statistics
• Measurements and central tendency
• Positive and negative skew
• Mean, median, mode, and standard deviation
• Variability, range, and variance
• Normal distribution and standard scores
• Z-score
• T-score

Could you consider including pictures and graphics in your fact sheet? These visual aids can enhance the understanding of the statistical concepts, making the information more accessible and engaging (optional).

Could you cite 2 to 3 peer-reviewed sources?