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Arada [10]
3 years ago
14

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:
Mathematics
1 answer:
SCORPION-xisa [38]3 years ago
7 0

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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