hi team,
I got the following question given below. According to me this should be solved using z test as the sample size is more than 30. But they are using t test. What is the correct method z test or t test? Please advice
A social worker wants to know whether the mean annual salary of her clients
matches the mean annual salary for all city residents, which is $28,000, or whether
it is less. She obtains a random sample of her clients salaries of size 36. The
mean of the sample is $27,500 and the standard deviation is $1,200. Perform a
hypothesis test at the 5% level of significance
Thanks
Simi
I got the following question given below. According to me this should be solved using z test as the sample size is more than 30. But they are using t test. What is the correct method z test or t test? Please advice
A social worker wants to know whether the mean annual salary of her clients
matches the mean annual salary for all city residents, which is $28,000, or whether
it is less. She obtains a random sample of her clients salaries of size 36. The
mean of the sample is $27,500 and the standard deviation is $1,200. Perform a
hypothesis test at the 5% level of significance
Thanks
Simi