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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

tutor3 : Hello Student, May I help you with your Math problems?
student : In the 1990s, the U.S. Justice Department and other groups studied possible abuse by Philadelphia police officers in their treatment of minorities. One study, conducted by the ACLU analyzed whether African American drivers were more likely than others in the population to be targeted by police for traffic stops. Researchers studied the results of 262 police car stops during one week in 1997. Of those, 207 of the drivers were African American, or 79% of the total. At that time, Philadelphia’s population was 42.2% African American. Does the number of African Americans stopped give strong evidence of possible bias, being higher than you’d expect if we take into account ordinary random variation?
tutor3 : Fax your homework to 206-339-8302. or, email to *****@aafter.com. Include your email and phone number. mention youe deadline and we will send in the answer by that time
tutor3 : i can give you a hint right now that is
yes there is bias in car stops .more african americans were stopped rather than normal americans
student : so the fact that more were stopped gives strong evidence?
tutor3 : yes more africans were stopped is evident
student : thanks. could you suggest a starting point for showing this using formulas?
tutor3 : Please note, due to lack of resources, we can only do 1 problem FREE in 24 hours period. You can always come back tomorrow for another free problem. Please, tell your friends about our free service - 1 free in 24 hours
student : Thank you so much! Will do.
tutor3 : welcome

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