Mrs.beck shops from the clearance rack of dresses.The stem and leaf plot represents the sale prices of dresses in Mrs.becks size
.What statement is true?
F: 20 percent of the dresses cost more than $50
G:one-fifth of the dresses range in price from $30 to $40
C:Fifteen percent of the dresses cost less than $20
D:Four percent of the dresses cost $65
F: 20 percent of the dresses cost more than $50
G:one-fifth of the dresses range in price from $30 to $40
C:Fifteen percent of the dresses cost less than $20
D:Four percent of the dresses cost $65
1 answer:
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Answer:
Option D -
Step-by-step explanation:
Given : The manufacturer measures 19 randomly selected dowels and finds the standard deviation of the sample to be s=0.16.
To find : The 95% confidence interval for the population standard deviation sigma?
Solution :
Number of sample n=19
The degree of freedom is Df=n-1=19-1=18
The standard deviation of the sample is s=0.16
Applying chi-square table to find critical value,
Upper critical value of is
Lower critical value of is
Lower limit of the 95% confidence interval for the population variance
Upper limit of the 95% confidence interval for the population variance
So, The 95% confidence interval for the population variance is [0.0146, 0.0560]
Now, The 95% confidence interval for the population standard deviation is
or
Therefore, Option D is correct.
The 95% confidence interval for the population standard deviation is