1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the sample mean. Be sure to show whether you use the t- or z- value, and what value you use. Even though you are normally “allowed” to use an approximate value of “t” or “z” for this percent confidence, I want you to use the exact value appropriate for these circumstances. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the “t” or the “z”.

please explain me clearly

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I found z value and I am in confusion which table to use either z or t table
and how to explain it clearly.
z lies btwn -1.96 and +1.96

Do I need to use two tailed or one tailed ?

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Do I need to use two tailed or one tailed

Please, be patient. I know about the normal table for the Z distribution, but I know nothing about the t distribution. There is a member here that may help you about that, but you'll have to wait for this member to come online and go through your question.

Thanks.

Please, be patient. I know about the normal table for the Z distribution, but I know nothing about the t distribution. There is a member here that may help you about that, but you'll have to wait for this member to come online and go through your question.

Thanks.

Please help me in my doubts