Since the sample size is small (below 30), we take the sample size and subtract 1 to get the degrees of freedom (df). ExpDesign Studio Toolkits include four tools: Graphic Calculator, Distribution Calculator, Confidence Calculator and TipDay. The graphic calculator allows you to evaluate complicated expressions, plot functions, plot data, copy graph, and print results.

Copy the graph by clicking the Graph button and paste into other application software such as MS Word using Paste or Paste Special method. The distribution calculator allows users to calculate the probability density, probabilities, and inverse probability functions for the following probability distributions: Binomial, Chi-sq, Exponential, F-, Poisson, Standard Normal, Student-t, and Weibull distributions. The confidence interval (CI) calculator allows users to calculate the following confidence intervals: One proportion Exact CI, One proportion CI using normal approximation, one mean CI using t-distribution, one mean CI using normal approximation, two-proportion CI using t-distribution, two-mean CI using t-distribution, two-mean CI using normal distribution, and CI for variance ratio using F-distribution. This statistics calculator computes test-statistics and p-values for standard hypothesis tests, as well as calculates confidence intervals.

The posting of advertisements, profanity, or personal attacks is prohibited.Click here to review our site terms of use. Since you've already submitted a review for this product, this submission will be added as an update to your original review. If you believe this comment is offensive or violates the CNET's Site Terms of Use, you can report it below (this will not automatically remove the comment). 6. Understand how sample size, level of confidence and standard deviation affect confidence interval length.

Other scenarios to think about: What would happen to the length of our confidence intervals if we increase our sample size from 60 to 100? Would our intervals decrease or increase in length? What if the population standard deviation increased?

3. How large a sample of one-bedroom apartments above would be needed to estimate the population mean within plus or minus $50 with 90% confidence?

We calculate the lower estimate by the formula, lower estimate= mean - (standard deviation)(value of t?). This app is a perfect addition to the many scientific and graphing calculators in the app store that do not possess this functionality. Which of the assumptions listed above might be problematic in making inference to the population in Question 4?

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