Jascko Corp. wants to determine if their customers are satisfied with the equipm

Question

Jascko Corp. wants to determine if their customers are satisfied with the equipment they’re buying from Jascko, in order to determine if Jascko should change some of their manufacturers. Jascko wants to make sure that the defective equipment (factory damaged and delivery damaged) are within the normal ranges of the HVAC industry standard

Assuming a population standard deviation of _______ submissions, a sample of 1200 was drawn to determine, and mean is equal to ________

1. The validity of Jascko Corporation using a 95% confidence interval to determine if their closed submissions are within the normal ranges of the industry standards.

2. The number of closed submissions that Jascko Corporation must average in order for the number to fall in a 98% confidence interval according to the industry standards?

Type of Manufacturers Equipment Number Conditions Factory Damaged Delivery Damaged Perfect Conditions 13% 26% 41% 2,300 4,584 7,340 Top Customers 80%

Explanation / Answer

One-Sample T: C1

Variable N Mean StDev SE Mean      95% CI
C1        3 4741   2524     1457 (-1528, 11011)

MTB > Onet C1;
SUBC>   Confidence 98.0.

One-Sample T: C1

Variable N Mean StDev SE Mean      98% CI
C1        3 4741   2524     1457 (-5406, 14889)

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