1. A random sample of 150 students has a test score average with a standard deviation of 0.78. Find the error of the estimate if c=0.98.

2. In a random sample of 28 families, the average weekly food expense was $95.60 with a standard deviation of$22.50. Assume the distribution of

I greatly appreciate any one's help. These are problems I have struggled with this semester....and now that the end is winding down I would love to figure them out for future references. Thank so much to everyone!

2. Originally Posted by loutja35
1. A random sample of 150 students has a test score average with a standard deviation of 0.78. Find the error of the estimate if c=0.98.

2. In a random sample of 28 families, the average weekly food expense was $95.60 with a standard deviation of$22.50. Assume the distribution of

I greatly appreciate any one's help. These are problems I have struggled with this semester....and now that the end is winding down I would love to figure them out for future references. Thank so much to everyone!
For the first explain what c=0.98 means, also the second is incomplete

CB