Thanks for your question! I understand the confusion as this question's phrasing is tricky and meant to truly test your understanding. The question initially states that the mean weight is intended to be 5g i.e H0: = 5g. Then, it tells us to test this H0 and prove its not above 5g, which is the same as telling us to prove H1 is false. Therefore, H1 would be stating that the mean weight is > 5g. If we had rejected H0 (hence accepting H1), it would mean that the mean weight IS higher than 5g. However, because we failed to reject H0, it means we reject H1, hence showing that the mean weight of tablets ISN'T above 5g.
If the problem does not say is normally distributed we can use the Z or t formula. Is what my Dr said in our class. I dont know which is which. Can you pls expain for me
This is because in the question, we know for a fact that the car journey to work originally took 42 minutes - therefore H0=42. On the other hand, it then says that after the road layout being altered, Celia believes that this has INCREASED the journey time - hence H1 > 42.
The way u teach is very nice so I need more videos from you
Different topics
For the second example isnt it supposed to be less than or equal to 5....they said not above 5
Thanks for your question! I understand the confusion as this question's phrasing is tricky and meant to truly test your understanding. The question initially states that the mean weight is intended to be 5g i.e H0: = 5g. Then, it tells us to test this H0 and prove its not above 5g, which is the same as telling us to prove H1 is false. Therefore, H1 would be stating that the mean weight is > 5g. If we had rejected H0 (hence accepting H1), it would mean that the mean weight IS higher than 5g. However, because we failed to reject H0, it means we reject H1, hence showing that the mean weight of tablets ISN'T above 5g.
@@pax_academy Well explained, thanks for the clarification
If the problem does not say is normally distributed we can use the Z or t formula. Is what my Dr said in our class. I dont know which is which. Can you pls expain for me
It's good I now get the understanding
Can u help me with this question pls if I can possibly show u, amazing explanation
what is the difference between t test and z test? the formulas are the same?
sample num
Sample size is greater or equal to 30 = Z test
If it’s less than 30 = T test
why are you blending the equal sign and the other inequality signs?
This is because in the question, we know for a fact that the car journey to work originally took 42 minutes - therefore H0=42. On the other hand, it then says that after the road layout being altered, Celia believes that this has INCREASED the journey time - hence H1 > 42.
@@pax_academy the null hypothesis is constructed wrongly in several examples. When alternative hypothesis is mu>x0, the null hypothesis should be mu