Timeline for Problem about normal distribution
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 20, 2016 at 17:57 | answer | added | Harvey Motulsky | timeline score: 1 | |
| Dec 20, 2016 at 9:45 | answer | added | statsplease | timeline score: 0 | |
| Dec 19, 2016 at 5:00 | comment | added | Michael R. Chernick | When you change the problem to replace 87.5 in your probability statement to 76 doesn't change the direction of the inequality even though the numerator now becomes negative. | |
| Dec 19, 2016 at 3:56 | comment | added | davidaap | But why Z>-6.47? Why it isn't Z<-6.47 since a greater mean means that Z will be less than -6.47. I am applying the formula $\sigma_{\bar{X}}=\frac{\sigma}{\sqrt{n}}$ | |
| Dec 19, 2016 at 3:18 | comment | added | Michael R. Chernick | For the second question if the statistic is calculated correctly as -6.47 you should be using P(Z>-6.47) . Neither problem is asking for a test of hypothesis so there is no significance level to worry about. You are just computing the normal probabilities. Make sure that you are computing the sample standard deviation correctly.. | |
| Dec 19, 2016 at 2:28 | comment | added | davidaap | I don't have that info | |
| Dec 19, 2016 at 1:49 | comment | added | dnbwise | what is the significance level? | |
| Dec 19, 2016 at 0:28 | review | First posts | |||
| Dec 19, 2016 at 0:30 | |||||
| Dec 19, 2016 at 0:25 | history | asked | davidaap | CC BY-SA 3.0 |