by Dawn Wright | Oct 4, 2018

Question: The problem I struggled with this week is 8.1.27. It seemed like all the rest of the problems in the first chapter, but I got it wrong because I used “0” instead of the µ1-µ2 value. Not sure when I am supposed to use that value or how it is determined. I...
by Dawn Wright | Oct 3, 2018

Question: I have hit the wall on a simple problem. I seem to be hitting these more often now. At any rate. 8.1.11, the difference between two means hypothesis test standardized test statistic requires µ1 – µ2. So, how does one calculate this when we are never...
by Dawn Wright | Sep 16, 2018

Joe, Two important points you bring up: Do not round intermediate values in a string of calculations. Wait until the very last step/answer to round to the number of decimals required by MyStatLab. On this problem and many others in this course, rounding too early can...
by Dawn Wright | Sep 3, 2018

Because it is not often used, save in intro stats courses, and is relatively simple to calculate, most stats software programs (StatCrunch included) do not have a special tool to help. Instead, you will need to manually recreate the formula using Excel or a...
by Dawn Wright | Jul 27, 2018

Section 5.5: Normal Approximation to the Binomial Distribution The premise in our Larson textbook for using the normal approximation is that finding the binomial probability of an “less than x” or “greater than x” problem would be onerous – having to manually...
by Dawn Wright | Jul 23, 2018

Joe, I think you are understanding confidence intervals, but I am not sure I am understanding your comments. So, let me restate them a bit. A 95% confidence interval means that if you repeat exactly the same process/experiment many times, 95% of the time the...