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Anettt [7]
3 years ago
11

22 random samples were selected from a population that has a normal distribution the sample has a mean of 99 and a standard devi

ation of 5 construct a 95% confidence interval for the population standard deviation .
Mathematics
2 answers:
strojnjashka [21]3 years ago
6 0

Answer:

4, 7

Step-by-step explanation:

gradpoint

olga2289 [7]3 years ago
3 0

Answer:

(96.91, 101.09)

Step-by-step explanation:

To calculate the interval, you require the Z value at 95% confidence interval. The Z value is 1.96. The formula to calculate the confidence interval:

X-Zs/\sqrt{x} \\X+Zs/\sqrt{x}

Where X is the mean and s is the standard deviation and x the sample size:

99-1.96\cdot{5}/\sqrt{22} \\99+1.96\cdot{5}/\sqrt{22}

The interval is (96.91, 101.09)

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