A Researcher Determined the Size Sample Necessary to Estimate Two

question 4

Multiple Choice

A researcher determined the size sample necessary to estimate two population means Y and Z.The indicated sizes were 200 to estimate Y and 300 to estimate Z with the specified degrees of confidence and precision.The researcher decided therefore to use a sample of size 250.Assuming the estimates of the population standard deviation were correct

• A)the estimate of Y is more precise than desired while that for Z is less precise than desired.
• B)the estimate of Y is less precise than desired while that for Z is more precise than desired.
• C)Y is estimated with exactly the specified degree of precision while Z is estimated less precisely than desired.
• D)Z is estimated with exactly the specified degree of precision while Y is estimated less precisely than desired.
• E)Both Y and Z are estimated with the exact specified degree of precision.

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Definitions:

Hall-effect Sensors

Sensors that detect the presence of a magnetic field and convert it into an electrical signal.

Variable Capacitance Sensors

Sensors that detect changes in capacitance, which can be used to measure various parameters, such as pressure, position, or acceleration.

Potentiometers

Potentiometers are variable resistors used to measure the electrical potential (voltage), often found in devices for adjusting volume or tuning.

One-speed Fallback

A safety feature in some electrical or mechanical systems that allows operation at a safe, reduced speed in case of some failures.