A simple random sample of size 29 is drawn from a normal population whose standard deviation is=1.5. The sample mean isx=18.2x

a.) Construct a 85% confidence level for. (Round answers to two decimal place.)

margin of error:

lower limit:

upper limit:

b.) If the population were not normally distributed, what conditions would need to be met? (Select all that apply.)

• systematic sampling
• large enough sample size n
• the population needs to be uniformly distributed
• is unknown
• is known
• the population needs to be normally distributed
• simple random sample

Is the result in part a.) valid?

• No
• Yes