Minimum Sample Size

1. Find the margin of error for the given values of c,s,and n. c=0.90,s=2.9,n=100

2. Construct the confidence interval for the population mean u. c=0.98, x=8.4,s=0.3,and n=55. A 985 confidence interval for u is: (_,_) Round to two decimal places as needed

3. C=0.90,x=15.8,s=7.0,and n=85
A 90% confidence interval for u is (_,_)

4.Find the minimum sample size needed to estimate u for the given values of c,s,and E.
c=0.90,s=8.8,and E=1. Assume that the preliminary sample has at least 30 members.
n=

5. A random sample of 50 home theatre systems has a mean price of $120.00 and a standard deviation is $19.90. Construct a 90% and a 95% confidence interval for the population mean. Then interpret the results.

6. A random sample of 43 gas grills has a mean price of $642.40 and a standard deviation of $59.70. The 90% confidence interval is:_____ and the 95% confidence interval is:_____ Which one is wider?