$('input.radio[value="Y"]').click(function(){ ...

<script type="text/javascript">
 
  $(document).ready(function() {
 
    // Initially disable the Next/Submit button
    $('#movesubmitbtn').hide();
 
    // Listeners on Yes/No radios to toggle the Next/Submit button
    $('#label-answer535778X13268X208195Y').click(function(){
      $('#movesubmitbtn').show();
    });
    $('#label-answer535778X13268X208195N').click(function(){
      $('#movesubmitbtn').hide();
    });
 
  });
 
</script>
 

<script type="text/javascript">
 
  $(document).ready(function() {
 
    // Initially disable the Next/Submit button
    $('#movenextbtn, #movesubmitbtn').hide();
 
    // Listeners on Yes/No radios to toggle the Next/Submit button
    $('#label-answer{SGQ}Y').click(function(){
      $('#movenextbtn, #movesubmitbtn').show();
    });
    $('#label-answer{SGQ}N').click(function(){
      $('#movenextbtn, #movesubmitbtn').hide();
    });
 
  });
 
</script>

<script type="text/javascript">
 
  $(document).ready(function() {
 
    // Initially disable the Next/Submit button
    $('#movenextbtn, #movesubmitbtn').prop('disabled', true);
 
    // Listeners on Yes/No radios to toggle the Next/Submit button
    $('#label-answer{SGQ}Y').click(function(){
      $('#movenextbtn, #movesubmitbtn').prop('disabled', false);
    });
    $('#label-answer{SGQ}N').click(function(){
      $('#movenextbtn, #movesubmitbtn').prop('disabled', true);
    });
 
  });
 
</script>