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WITCHER [35]
3 years ago
12

To estimate the mean of a population with unknown distribution shape and unknown standard deviation, we take a random sample of

size 64. The sample mean is 22.3 and the sample standard deviation is 8.8.
If we wish to compute a 92% confidence interval for the population mean, what will be the t multiplier?
Mathematics
1 answer:
Naddika [18.5K]3 years ago
7 0

Answer:

t_{critical} = \pm 1.7793                        

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 64

Sample mean = 22.3

Sample standard deviation = 8.8

We want to estimate 92% confidence interval.

92% Confidence interval:  

\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}  

Putting the values, we get,

Degree of freedom = n - 1 = 63

t_{critical}\text{ at degree of freedom 63 and}~\alpha_{0.01} = \pm 1.7793  

22.3 \pm 1.7793(\dfrac{8.8}{\sqrt{64}} ) = 22.3 \pm 1.95723 = (20.34,24.26)

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Step-by-step explanation:

Given : Danielle earns $36.80 for 4 hours of yardwork. MacKenzie earns $50.40 for 6 hours of yardwork.

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Step-by-step explanation:

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