Question
Grades on a standardized test are known to have a mean of 10901090 for students in...
Grades on a standardized test are known to have a mean of
10901090
for students in the United States. The test is administered to
458458
randomly selected students in Florida; in this sample, the mean is
1104.171104.17
and the standard deviation
(s)
is
117.72117.72.
The 95% confidence interval for the average test score for Florida students is
(nothing,
nothing).
(Round
your responses to two decimal
places.)
Homework Answers
Answer #1
t critical value at 0.05 level with 457 df = 1.965
95% confidence interval for 
is
- t * S /
sqrt(n) < < + t * S /
sqrt(n)
1104.17 - 1.965 * 117.72 / sqrt( 458) < < 1104.17 +
1.965 * 117.72 / sqrt( 458)
1093.36 < < 1114.98
95% CI is ( 1093.36 , 1114.98)
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