A sample of size n- 200 has a known population standard deviation of 15.0. The population appears to be skewed. Determine whether a margin of error should be calculated using a critical value of za, a critical value of ta/2, or neither.
A. a critical value of ta/2
B. a critical value of za/2
C. neither
Answer: b. a critical value of za/2, i picked this because the value is greater than 30. Not sure if it’s correct. Please help.
1 answer
this is correct i just took the test
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