The following eight observations were drawn from a normalpopulation whose variance is 100:
12
8
22
15
30
6
29
58
Part A
What is the standard error of the sample mean, based on theknown population variance? Give your answer to two decimal placesin the form x.xx
Standard error:
Part B
Find the lower and upper limits of a 90% confidence interval forthe population mean. Give your answer to two decimal places in theform xx.xx
Lower limit:
Upper limit:
Part C
True or false:
If the population was not normally distributed the confidenceinterval calculation above would not be valid. Answer by writing Tor F in the space provided.
Answer:
