Question

random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2 years. The 95% confidence interval for the true average age of all students in the university is ____________

Select one:

a. 24.5 to 25.4

b. 20.5 to 29.5.

c. 23.0 to 27.0

d. 20.0 to 30.0

Answer 1

0 Solution :- Given that Sample standard deviations 2 Sample size (n)=64 Sample mean T = 25 bevel of agrificance. 250.00 Degoce of foce dom of on-1 64-1-63. "ť value ta 2 tooo 1993. Escel foonila to governo df) 2 Standard Foooo, JE 2 Vou allo ū 3.E = 0.25 Margin OF E000. E=35* = 1.9983 * 0:25 E : 0.499575 confidence interval is interval lasco limit - F-E : 25-0.499573 interval uyppes limit 14.500ua EXTE :25+00499575 = 25.499576 95% Cofidence inteoval ig (2405 <l< 2504) option @ 95 cossect Answeo. 24•5 to 25.4

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