How many people do you need to survey in order to generate a meaningful result? This Sample Size Calculator will help you find out. Let's say you have 10,000 customers and you'd like to determine with a 95% confidence level how they will react to your new pricing plan, with a confidence interval of 4% (meaning results will be indicative, plus or minus 4%, of the entire population, ie. your customer base). See, you're learning already. According to this calculator, you will need a sample size of 566 responses to gauge feedback to your desired degree of accuracy. There is also a calculator that will help you find the confidence interval of a survey already taken based on the number of respondents, total population and percentage of respondents who picked a specific answer. This handy tool is presented as a public service by Creative Research Systems. You'll find helpful articles on statistical significance and survey design at the site as well.
This simple but powerful calculator from Longbow Direct Marketing will help you determine the correct population sample for any kind of testing. The calculator figures sample size for both A/B split and multivariate testing, along with different confidence levels, expected number of responses, significant difference and other statistics. If you're not sure how to use a particular statistic, mouse over the icon to the right on the same line, and a quick explanation will pop up.
Can you make any money from Social Media? Also, what's it really costing
you? This handy calculator will do a detailed cost-benefit analysis,
identifying total costs for research, setup, maintenance and staff time, as
well as real and intrinsic benefits from Web traffic, PR and word of mouth. By
the time you reach the bottom line, you'll be able to make more informed decisions about the scope of your Social Media efforts.
These useful CPM (Cost Per Thousand) calculators will help you compare apples to apples when buying media. For example, if you know the size of the audience and the amount the media outlet is charging, you can calculate how much you are paying per thousand impressions. Or, if you're a publisher and want to adjust your rate card, you can plug in a CPM rate plus your audience size and get the dollar amount. A handy way to look at CPM from different angles without getting twisted up in your own arithmetic.
These three calculators on the Web Digest For Marketers site will help you
figure CPM (Cost Per Thousand) three different ways when planning your ad
budgets: figure CPM using exposures and cost; cost based on exposures and CPM,
and exposures using cost and CPM.