The Owner of a Local Nightclub Has Recently Surveyed a Random

question 7

Multiple Choice

The owner of a local nightclub has recently surveyed a random sample of n = 250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to alter the entertainment to appeal to an older crowd. If not, no entertainment changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. If she wants to be 99% confident in her decision, what conclusion can she make?

• A) There is not sufficient evidence that the mean age of her customers is over 30.
• B) There is sufficient evidence that the mean age of her customers is over 30.
• C) There is not sufficient evidence that the mean age of her customers is not over 30.
• D) There is sufficient evidence that the mean age of her customers is not over 30.

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Definitions:

Miscarriage

The spontaneous loss of a pregnancy before the fetus can survive outside the uterus, typically before 20 weeks of gestation.

Stillbirth

is the birth of an infant who has died in the womb after 20 weeks of pregnancy, before or during delivery.

Pregnancy Loss

The loss of a pregnancy before the fetus can survive outside the uterus, also known as miscarriage.

Amniocentesis

A medical procedure used in prenatal diagnosis, involving the extraction of a small amount of amniotic fluid for testing.