1) Using table G, find the values for CHI-square left and right if alpha = 0.01 and n = 23.2) ...

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1)   Using table G, find the values for CHI-square left and right if alpha = 0.01 and n = 23.2)   Find the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard deviation of 2.3. Assume the variable is normally distributed.3)   Find the 95% confidence interval for the variance and standard deviation of the ounces of Mike’s hard cider that a machine dispenses in 12 ounce cups. Assume the variable is normally distributed. The raw data are: 12.3, 12.1, 12.2, 11.8, 12.0, 12.5, 11.7, and 11.9.
	
Document Preview: Stat Assignment 6A XXXXXXXXXXUsing table G, find the values for CHI-square left and right if alpha = 0.01 and n = 23.                XXXXXXXXXXFind the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard deviation of 2.3. Assume the variable is normally distributed.  XXXXXXXXXXFind the 95% confidence interval for the variance and standard deviation of the ounces of Mike’s hard cider that a machine dispenses in 12 ounce cups. Assume the variable is normally distributed. The raw data are: 12.3, 12.1, 12.2, 11.8, 12.0, 12.5, 11.7, and 11.9. Stat Assignment 6B XXXXXXXXXXThe average production of peanuts in W. Virginia is 3000 pounds per acre. A new plant food is test on 60 acres and the mean yield is 3120 pounds per acre for these plots with a standard deviation of 578 pounds. At Alpha = 0.05, can one conclude that the average production has increased with the new food?                XXXXXXXXXXA researcher claims that the yearly consumption of soft drinks is 52 gallons per person. In a sample of 50 randomly selected folks who drink soft drinks, the mean was 56.3 gallons and the standard deviation was 3.5 gallons. At Alpha = .01, is the researcher’s claim valid?

David · Accepted Answer

Stat Assignment 6A
1)      Using table G, find the values for CHI-square left and right if alpha = 0.01 and n = 23. 
 A1) Value of chi square right =41.638 
  Value of chi square left=10.196
2)      Find the 90% confidence interval for the variance and standard deviation if a sample of 15 
has a standard deviation of 2.3. Assume the variable is normally distributed. 
 A2) The 90% confidence interval for variance is given by: 
 {
2
2
2
2 )1(
,
)1(

SnSn 
} 
From the data given to us, n=15 S^2=5.29 
Thus the CI is { (14*5.29)/23.685),(14*5.29)/6.571} 
Thus the CI={3.1269,11.27142} 
Confidence interval for standard deviation: {1.7683, 3.

1) Using table G, find the values for CHI-square left and right if alpha = 0.01 and n = 23. 2) Find the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard...

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