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State of K is a platform for answering a question by sharing and summarizing a list of all the studies that examine that question.

PUBLIC AFFAIRS QUESTIONS

Do gun buyback programs reduce gun violence?

11 Studies (1994 to 2016)

Insuff. evidence Mixed results No Yes

Do police body cameras reduce use of force by the police?

15 Studies (2013 to 2019)

Insuff. evidence Mixed results No Yes

Do undocumented immigrants commit more crime than native-born Americans?

10 Studies (2008 to 2018)

Insuff. evidence Mixed results No Yes

Is there a consensus among scientists that human activity is causing climate change?

11 Studies (2004 to 2015)

Insuff. evidence Mixed results No Yes

FINANCE QUESTIONS

Did quantitative easing reduce US mortgage rates?

3 Studies (2012 to 2016)

Insuff. evidence Mixed results No Yes

Does money invested 50% in a US stock index fund and 50% in a US bond index fund have at least a ...?

11 Studies (1994 to 2017)

Insuff. evidence Mixed results No Yes

Does money invested in a US stock index fund have at least a 95% chance of lasting for 30 years a...?

18 Studies (1994 to 2018)

Insuff. evidence Mixed results No Yes

CHILD CARE QUESTIONS

Do formula-fed infants sleep more than breastfed infants?

14 Studies (1983 to 2017)

Insuff. evidence Mixed results No Yes

How do I overcome my fear of childbirth?

25 Studies (1998 to 2018)

Lit. review Highly regarded source No info

SPORTS QUESTIONS

Do baseball players perform worse in years where they perceive themselves to be under-compensated?

6 Studies (1979 to 1999)

Insuff. evidence Mixed results No Yes

Is there really a home-field advantage in sports?

46 Studies (1977 to 2018)

Insuff. evidence Mixed results No Yes

Why is there a homefield advantage in baseball?

3 Studies (2005 to 2015)

Lit. review Highly regarded source No info

PUBLIC AFFAIRS QUESTIONS

Do gun buyback programs reduce gun violence?

11 Studies (1994 to 2016)

Insuff. evidence Mixed results No Yes

Do police body cameras reduce use of force by the police?

15 Studies (2013 to 2019)

Insuff. evidence Mixed results No Yes

Do undocumented immigrants commit more crime than native-born Americans?

10 Studies (2008 to 2018)

Insuff. evidence Mixed results No Yes

Is there a consensus among scientists that human activity is causing climate change?

11 Studies (2004 to 2015)

Insuff. evidence Mixed results No Yes

FINANCE QUESTIONS

Did quantitative easing reduce US mortgage rates?

3 Studies (2012 to 2016)

Insuff. evidence Mixed results No Yes

Does money invested 50% in a US stock index fund and 50% in a US bond index fund have at least a ...?

11 Studies (1994 to 2017)

Insuff. evidence Mixed results No Yes

Does money invested in a US stock index fund have at least a 95% chance of lasting for 30 years a...?

18 Studies (1994 to 2018)

Insuff. evidence Mixed results No Yes

CHILD CARE QUESTIONS

Do formula-fed infants sleep more than breastfed infants?

14 Studies (1983 to 2017)

Insuff. evidence Mixed results No Yes

How do I overcome my fear of childbirth?

25 Studies (1998 to 2018)

Lit. review Highly regarded source No info

SPORTS QUESTIONS

Do baseball players perform worse in years where they perceive themselves to be under-compensated?

6 Studies (1979 to 1999)

Insuff. evidence Mixed results No Yes

Is there really a home-field advantage in sports?

46 Studies (1977 to 2018)

Insuff. evidence Mixed results No Yes

Why is there a homefield advantage in baseball?

3 Studies (2005 to 2015)

Lit. review Highly regarded source No info