Thirty-nine randomly selected students in a college took the stat final. The sample mean was 68.9 with standard deviation 8.3 .
The 99% confidence interval estimate of the population mean is:
1 answer:
Answer:
(65.5775 , 72.2225)
Step-by-step explanation:
Confidence Interval is the range around sample mean, likely to consist the population parameter.
Formula = x' <u>+</u> z (s / √n)
= 68.9 <u>+</u> 2.5 (8.3 / √39)
= 68.9 <u>+</u> 3.3225
(65.5775 , 72.2225)
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