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Reika [66]
3 years ago
6

A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 9.

9 and the sample standard deviation is 0.30, find the 95% confidence interval for the true mean.
Mathematics
1 answer:
Sladkaya [172]3 years ago
3 0

Answer:

9.9-2.14\frac{0.30}{\sqrt{15}}=9.734    

9.9+2.14\frac{0.30}{\sqrt{15}}=10.066    

Step-by-step explanation:

Information given

\bar X= 9.9 represent the sample mean

\mu population mean (variable of interest)

s=0.3 represent the sample standard deviation

n=15 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

The degrees of freedom are given by:

df=n-1=15-1=14

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and the critical value wuld be t_{\alpha/2}=2.14

Now we have everything in order to replace into formula (1):

9.9-2.14\frac{0.30}{\sqrt{15}}=9.734    

9.9+2.14\frac{0.30}{\sqrt{15}}=10.066    

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