The graph of f ′(x) is continuous and increasing with an x-intercept at x = 5. Which of the following statements must be true?
1 answer:
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Answer:
[ 1,532.41, 1,617.59]
Step-by-step explanation:
Data provided :
Sample size, n = 120
Mean = $1,575
Standard deviation = $215
Confidence level = 97%
Now,
Confidence interval = Mean ±
also,
for 97% confidence level z score = 2.17 [from standard z-table]
= $1,575 ±
= $1,575 ± 42.59
Therefore,
Confidence interval = [ $1,575 - 42.59, $1,575 + 42.59]
= [ 1,532.41, 1,617.59]