Resolved: Question 1 - You have a z-score of 2.31. What is the p-value of this test?
I think we can solve this by checking z-table for 2.3 and 0.01 which is 0.98956. So we subtract this from 1 and get 0.01044 which multipy by 2 to get p-value = 0.02088. So why answer is 'not enough information'.
Hello Kartik!
Thanks for reaching out!
This is a tricky question. Yes, you know the z-value BUT you do not know if this is a left-tailed, right-tailed or two-tailed test. Once you know this, you can calculate the p-value.
By the way, you can use the p-value calculator that we have developed for calculating the p-value with great certainly.
Hope this answers you question!
Best,
The 365 Team
Despite the Z-score is positive (indicating an upper tail), indeed, we need some more specification about the type of test, to know if we are supposed to compare the p-value to alpha/2(for a two tailed test) or just alpha (for a one tailed test). If p< alpha or p<alpha/2, we reject the null hypothesis.