A Manufacturer of a Chemical Used in Glue, Attempting to Control

question 184

Multiple Choice

A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0ppm. A random sample of 50 air specimens produced the following statistics: sample mean = 3.1 ppm, sample standard deviation = 0.5 ppm. Assume measurements are normally distributed.
-The null and alternative hypotheses that would be used to halt production is ______.

• A)H₀: ? = 3.0 vs.H_a: ? ? 3.0
• B)H₀: ? ? 3.0 vs.H_a: ? < 3.0
• C)H₀: ? ? 3.1 vs.H_a: ? < 3.1
• D)H₀: ? ? 3.0 vs.H_a: ? = 3.0
• E)H₀: ? ? 3.0 vs.H_a: ? > 3.0

Understand the anticipated longevity of cosmetic skin treatments.

Recognize various treatment methods for wrinkles and their procedural characteristics.

Understand the physiological responses of skin to environmental factors.

Identify common skin conditions and their causes.

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