2 BASIC STATISTICS 1.3.2. Sample variance. The sample variance is the statisticdefined by S2(X 1,X2,Xn)= 1 n− 1 Xn i=1 (Xi − X¯)2 (4)The observed value of S2 in any sampleis demoted by the lower case letter, i.e., s2. 1.1 Definitions of Statistics, Probability, and Key Terms 1.2 Data, Sampling, and Variation in Data and Sampling 1.3 Frequency, Frequency Tables, and Levels of Measurement. 1 1.1 Random Sampling 1 1.2 Some Important Statistics 2 1.3 Data Displays and Graphical Methods 6 1.4 Sampling distributions 6 1.4.1 Sampling distributions of means 10 1.4.2 The sampling distribution of the sample variance 12 1.4.3 t-Distribution 14 1.4.4 F-distribution 16 II ONE- AND TWO-SAMPLE ESTIMATION 16 2.1 Point Estimation and Interval. Roughly, given a set of independent identically distributed data conditioned on an unknown parameter, a sufficient statistic is a function whose value contains all the information needed to compute any estimate of the parameter (e.g. A maximum likelihood estimate). AP®️ Statistics is all about collecting, displaying, summarizing, interpreting, and making inferences from data. Learn a powerful collection of methods for working with data! If you're seeing this message, it means we're having trouble loading external resources on our website.
Suicide is the 10th leading cause of death in the US for all ages. (CDC)
Every day, approximately 123 Americans die by suicide. (CDC)
There is one death by suicide in the US every 12 minutes. (CDC)
Depression affects 20-25% of Americans ages 18+ in a given year. (CDC)
Suicide takes the lives of over 48,300 Americans every year. (CDC)
The highest suicide rates in the US are among Whites, American Indians and Alaska Natives.
Only half of all Americans experiencing an episode of major depression receive treatment. (NAMI)
80% -90% of people that seek treatment for depression are treated successfully using therapy and/or medication. (TADS study)
An estimated quarter million people each year become suicide survivors (AAS).
There is one suicide for every estimated 25 suicide attempts. (CDC)
There is one suicide for every estimated 4 suicide attempts in the elderly. (CDC)
Global Statistics
For more information on suicide stats by region and country visit the World Health Statistics Data Visualizations Dashboard.
Nearly 800,000 people die by suicide in the world each year, which is roughly one death every 40 seconds.
Suicide is the 2nd leading cause of death in the world for those aged 15-24 years.
Depression is the leading cause of disability worldwide.
Suicide among males is 4x’s higher than among females. Male deaths represent 79% of all US suicides. (CDC)
Rates 1999 -2017 (CDC/nchs)
Firearms are the most commonly used method of suicide among males (51%). (CDC)
Females are more likely than males to have had suicidal thoughts. (CDC)
Females experience depression at roughly 2x’s the rate of men.(SMH) Msg converter pro 1 5 2.
Females attempt suicide 3x’s as often as males. (CDC)
Poisoning is the most common method of suicide for females. (CDC)
1 in 100,000 children ages 10 to 14 die by suicide each year. (NIMH)
7 in 100,000 youth ages 15 to 19 die by suicide each year. (NIMH)
12.7 in 100,000 young adults ages 20-24 die by suicide each year. (NIMH)
The prevalence of suicidal thoughts, suicidal planning and suicide attempts is significantly higher among adults aged 18-29 than among adults aged 30+. (CDC)
Suicide is the 2nd leading cause of death for 15 to 24 year old Americans. (CDC)
Suicide is the 4thleading cause of death for adults ages 18-65. (CDC)
The highest increase in suicide is in males 50+ (30 per 100,000). (CDC)
Suicide ratesfor females are highest among those aged 45-54 (9 per 100,000). (CDC)
Suicide rates for males are highest among those aged 75+ (36 per 100,000). (CDC)
Suicide rates among the elderly Menutab pro for facebook 5 9. are highest for those who are divorced or widowed. (SMH)
Lesbian, gay, and bisexual kids are 3x more likely than straight kids to attempt suicide at some point in their lives.
Medically serious attempts at suicide are 4x more likely among LGBTQ youth than other young people.
African American, Latino, Native American, and Asian American people who are lesbian, gay, or bisexual attempt suicide at especially high rates.
41% of trans adults said they had attempted suicide, in one study. Folx pro 5 3 – download manager. The same study found that 61% of trans people who were victims of physical assault had attempted suicide.
Lesbian, gay, and bisexual young people who come from families that reject or do not accept them are over 8x more likely to attempt suicide than those whose families accept them.
Each time an LGBTQ person is a victim of physical or verbal harassment or abuse, they become 2.5x more likely to hurt themselves.
Statistics is the science concerned with developing and studying methods for collecting, analyzing, interpreting and presenting empirical data. Statistics is a highly interdisciplinary field; research in statistics finds applicability in virtually all scientific fields and research questions in the various scientific fields motivate the development of new statistical methods and theory. In developing methods and studying the theory that underlies the methods statisticians draw on a variety of mathematical and computational tools.
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Two fundamental ideas in the field of statistics are uncertainty and variation. There are many situations that we encounter in science (or more generally in life) in which the outcome is uncertain. In some cases the uncertainty is because the outcome in question is not determined yet (e.g., we may not know whether it will rain tomorrow) while in other cases the uncertainty is because although the outcome has been determined already we are not aware of it (e.g., we may not know whether we passed a particular exam).
Probability is a mathematical language used to discuss uncertain events and probability plays a key role in statistics. Any measurement or data collection effort is subject to a number of sources of variation. By this we mean that if the same measurement were repeated, then the answer would likely change. Statisticians attempt to understand and control (where possible) the sources of variation in any situation.
A-level Statistics 1 Pdf
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