$(window).load(function(){
$('input').change(function(){
    var allchecked=0;
    $('input').each(function(){
        var checked;
        if (checked = $(this).attr('checked')) {allchecked++};
        var numberofrooms = $('li[data-test='+$(this).data('test')+']');
        checked ?  numberofrooms.show('slow'): numberofrooms.hide('slow');
    });
    if(allchecked==0){$('li').show('slow');}
});
});