Title Tag Problem

I want to change the <title> tag. I changed it by logging in the WP Admin > Settings > General > Blog Title

The changes are applied successfully but only to the single post pages. I am, for some strange reason, unable to change the title on the Home page.

The weird thing is, even if I delete the following lines of code from the header.php file, the title still appears on the browser!

<title>
<?php if ( is_single() ) { ?> <?php } else { bloginfo(‘name’); } ?>
<?php?> <?php wp_title(‘ ‘); ?>
</title>