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(a) Suppose x has a normal distribution with=6. A random sample of size11has a sample mean of x = 50. Find a 90% confidence interval

(a) Supposexhas a normal distribution with=6. A random sample of size11has a sample mean ofx= 50.

Find a 90% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.)

  • lower limit
  • upper limit
  • margin of error

(b) Supposexhas a normal distribution with=14. A random sample of size43has a sample mean ofx= 70.

Find a 95% confidence interval for mu. What is the margin of error? (Round your answers to two decimal places.)

  • lower limit
  • upper limit
  • margin of error

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