How to auto populate a field based on the selection in a drop down box

Thank you again. I'm still missing something, and it is probably something very simple . . . it almost always is.  So here is a sample of my code and the results. No matter which program I choose, it will not populate the other fields. What am I missing?

var address = this.getField("address");

var phone = this.getField("phone");

var email = this.getField("email");

if(event.value == "Anthropology"){

 address.value = "541 Sampson Hall ";

 phone.value = "(555) 223-4419";

 email.value = "anthro@ist.edu";}

if(event.value == "Biology"){

 address.value = "219 Brownston Hall";

 phone.value = "(555) 223-5243";

 email.value = "biol@ist.edu ";}

if(event.value == "Communicatons"){

 address.value = "330 Marquette Hall";

 phone.value = "(555) 223-6639";

 email.value = "comm@ist.edu ";}

if(event.value == "English"){

 address.value = "411 Emerson Hall";

 phone.value = "(555) 223-7288";

 email.value = "engl@ist.edu ";}

if(event.value == "Psychology"){

 address.value = "339 Haverty Hall";

 phone.value = "(555) 223-4389";

 email.value = "psyc@ist.edu ";}

Ok, thanks for the help, but I guess I need to explain further. I have a list of 20 programs, and 5 fields to work with. I want Fields 2-5 populated based on the drop down menu choice from Field 1.

Field 1: Program

Field 2: Address

Field 3: CSZ (City/State/Sip)

Field 4: Dept Code

Field 5: Participants (number of participants)

Would it be easier if I program each of the four fields individually based on Field 1 rather than trying to populate all of them from Field 1?  To be honest, I haven't done this in a long time, and back then I did it with "if, else" statements, so I'm trying to wrap my head around how javascript compares to the "old way".

This question is asked a lot!! 

Here are some articles that discuss list programming.

https://acrobatusers.com/tutorials/change_another_field/

https://acrobatusers.com/tutorials/list_and_combo_in_lc/

https://www.pdfscripting.com/public/List-Field-Usage-and-Handling.cfm

As 'Validate' script of dropdown field use this:

var address = this.getField("Address");
var phone = this.getField("Phone");
var email = this.getField("Email");

if(event.value == "Biology"){
 address.value = "303 McKinley Hall";
 phone.value = "(800) 238-4732";
 email.value = "Biology@itsu.edu";}
//If you have more conditions to add addresses, phones, email add 'else if' here

else{
 address.value = "";
 phone.value = "";
 email.value = "";}