Concept explainers
(a)
To Find: The confidence interval.
(a)
Answer to Problem 17PPS
The required confidence interval is
Explanation of Solution
Given:
A sample of 500 students was asked for the average amount of money they spent a day.
The mean amount =$6.55.
The standard deviation=$2.75.
The formula used for 95% confidence interval is,
The 95% confidence interval for mean is,
Hence, required confidence interval is
(b)
To Find: The confidence interval for given condition.
(b)
Answer to Problem 17PPS
The 95% confidence interval is
Explanation of Solution
The formula used for 95% confidence interval is,
The 95% confidence interval for mean is,
Hence, required confidence interval is
(c)
To Explain: If sample is larger what is effect on the confidence interval.
(c)
Explanation of Solution
As the
Chapter 12 Solutions
Algebra 2
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