In an Experiment to Study the Effect of Vibrations on Plant

question 5

Multiple Choice

In an experiment to study the effect of vibrations on plant growth, the height of a chrysanthemum was measured three times. The reason for making the measurement three times instead of just once was probably to:

• A) decrease bias.
• B) eliminate confounding.
• C) increase reliability.
• D) completely eliminate measurement error.

---

Definitions:

Standard Normal Random Variable

A random variable with a mean of 0 and a standard deviation of 1 under the normal distribution.

Probability

Refers to the degree of certainty associated with the occurrence of a specific outcome in a random event.

z

Often symbolizes the standard score in statistics, indicating how many standard deviations an element is from the mean.

Uniformly Distributed

A description of a distribution where all outcomes are equally likely, the probability distribution is constant.