function validate() {
    var errors = "";
    if ($("#conversions").val() == "")
        errors += "- Please enter your expected conversion rate.\n";
    else if (isNaN($("#conversions").val()) || $("#conversions").val() > 100 || $("#conversions").val() <= 0)
        errors += "- Please enter a valid number for the conversion rate.\n";
    if ($("#versions").val() == "")
        errors += "- Please enter the number of combinations you have.\n";
    else if (isNaN($("#versions").val()) || $("#versions").val() <= 0)
        errors += "- Please enter a valid number for the combinations you have.\n";
    if ($("#resolution").val() == "")
        errors += "- Please enter desired change in conversion rate.\n";
    else if (isNaN($("#resolution").val()) || $("#resolution").val() > 100 || $("#resolution").val() <= 0)
        errors += "- Please enter a valid value for desired change in conversion rate.\n";
    if ($("#percent").val() == "")
        errors += "- Please enter the percentage of visitors to include in the test.\n";
    else if (isNaN($("#percent").val()) || $("#percent").val() <= 0 || $("#percent").val() > 100)
        errors += "- Please enter a valid number for percentage of visitors to include in the test.\n";
    if ($("#visitor").val() == "")
        errors += "- Please enter the average number of visitors on the test page.\n";
    else if (isNaN($("#visitor").val()) || $("#visitor").val() <= 0)
        errors += "- Please enter a valid number for the average number of visitors on the test page.\n";
    if (errors.length > 0) {
        alert(errors);
        return false;
    } else {
        var mean_size;
        var std_dev;
        var power = 0.8416;
        var significance = 1.6449;
        mean_size = $("#conversions").val() / 100;
        std_dev = Math.sqrt(mean_size * (1 - mean_size));
        var effect_size = mean_size * $("#resolution").val() / 100.0;
        var number_of_variations = parseFloat($("#versions").val());
        var percent = parseFloat($("#percent").val()) / 100;
        var per_day_visit = parseInt($("#visitor").val()) * percent;
        var per_variation_result = Math.pow((4) * (std_dev / effect_size), 2);
        var result = per_variation_result * (number_of_variations);
        result = Math.round(Math.round(result, 0) / per_day_visit);
        if (result == 0)
            $("#result").html("Less than a day");
        else
            $("#result").html(result + " day" + (result > 1 ? "s" : ""));
    }
}