At the bakery where you work, loaves of bread are supposed to weigh 1 pound. From experience, the weights of loaves produced at the bakery follow a Normal distribution with standard deviation s = 0.13 pounds. You believe that new personnel are producing

1

• At the bakery where you work, loaves of bread are
  supposed to weigh 1 pound. From experience, the
  weights of loaves produced at the bakery follow a
  Normal distribution with standard deviation s
  0.13 pounds. You believe that new personnel are
  producing loaves that are heavier than 1 pound.
  As supervisor of Quality Control, you want to
  test your claim at the 95 confidence level. You
  weigh 20 loaves and obtain a mean weight of 1.05
  pounds.
• 1. Identify the population and parameter of
  interest. State your null and alternative
  hypotheses.
• 2. Identify the statistical procedure you should
  use. Then state and verify the conditions
  required for using this procedure.3. Calculate
  the test statistic and the P-value. Illustrate
  using a graph.
• 4. State your conclusions clearly in complete
  sentences.

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11.2

• The National Center for Health Statistics reports
  that the mean systolic blood pressure for males
  35-44 years of age is 128 and the std. dev. Is
  15. The medical director of a large company looks
  at the medical records of 72 executives in this
  age group and finds that the mean systolic blood
  pressure in this sample is 126.07. Is there
  significant evidence at the 1 level that the
  companys executives have a different mean blood
  pressure from the general population? Assume the
  executives have the same standard deviation as
  the general population of middle-aged males.