Timeline for Hypothesis Testing for Means & Proportions. t-test vs z-test
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| S Mar 22 at 3:37 | history | became hot network question | |||
| S Mar 22 at 3:37 | history | became hot network question | |||
| Mar 22 at 0:27 | answer | added | Harvey Motulsky | timeline score: 2 | |
| Mar 21 at 23:08 | comment | added | Dave | @Apro9991 Then I request that you post a distinct question about that. Unlike some corners of the internet, Cross Validated is strictly Q&A, not a discussion forum or message board. $//$ If my answer here does not address why your teacher wants to use a z-test instead of a t-test, please do ask for clarification. | |
| Mar 21 at 23:02 | comment | added | Apro9991 | I would then ask you to write me a text about why n = 2 is problematic so that I can show it to my teacher and discuss it with him. And can you tell me how to calculate it truly? | |
| Mar 21 at 22:42 | comment | added | Dave | @Apro9991 and if Whuber and Flom and I say $n=2$ is problematic? | |
| Mar 21 at 21:03 | comment | added | Apro9991 | It's simply a math problem from my teacher and I don't know why nuclear power blockers are used. I know that n = 2 is correct because my teacher said it himself. | |
| Mar 21 at 20:45 | comment | added | whuber♦ | Out of curiosity, what is a "nuclear power blocker" and how might that improve the health of anyone? Please be aware, too, that sick days are likely far from independent (which means if this were a real problem you wouldn't have enough information to answer and ought to proceed carefully so you don't provide unsupportable opinions). Finally, wouldn't $n$ count employees rather than years? Otherwise you seem to be maintaining that $n=2$ in any t-test, which clearly isn't right. | |
| Mar 21 at 20:13 | answer | added | Dave | timeline score: 5 | |
| Mar 21 at 20:12 | answer | added | Peter Flom | timeline score: 2 | |
| Mar 21 at 20:03 | comment | added | Apro9991 | yes. The teacher also said that n is 2 because of the 2 years. Do you think it is wrong? | |
| Mar 21 at 20:02 | comment | added | Dave | So why is $n=2$, because there are two years? | |
| Mar 21 at 20:00 | comment | added | Apro9991 | The formula is following: t = (X-u)/(s/root(n)) . X is the sample mean which is 11.4, s is the stnadard deviation with 1.2 . u is the normal mean with 12.7 and n is the sample which is 2. t = (11.4-12.7)/(1.2/root(2)) . This is the way I calculated it to get the to get the test value | |
| Mar 21 at 19:43 | comment | added | Dave | Welcome to Cross Validated! Why do you use $n=2?$ Are there only two employees? $//$ Think about how the standard deviation factors into whether or not you want to use a t-test. I think your teacher wrote a bad problem, but I do see how your teacher came up with the claim to use z instead of t. | |
| S Mar 21 at 19:36 | review | First questions | |||
| Mar 21 at 20:07 | |||||
| S Mar 21 at 19:36 | history | asked | Apro9991 | CC BY-SA 4.0 |