A Proofreader Checked 160 Ads for Grammatical Errors Under the Null Hypothesis of a Uniform Distribution, the Expected

question 25

Multiple Choice

A proofreader checked 160 ads for grammatical errors. The sample frequency distribution is shown: $$\begin{array} { | l | c | c | c | c | } \hline \text { Number of Errors } & 0 & 1 & 2 & 3 \\\hline \text { Observed Frequency } & 10 & 65 & 71 & 14 \\\hline\end{array}$$ Under the null hypothesis of a uniform distribution, the expected number of times we would get 0 errors is:

• A)10.
• B)20.
• C)30.
• D)40.

Calculate probabilities associated with Poisson distributions.

Distinguish between different types of random variables and identify experiments as binomial.

Assess the appropriateness of using Poisson distribution for real-world phenomena.

Compute expected values and standard deviations for specific distributions.

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Definitions:

Anterior Roots

The front part of a spinal nerve that carries motor output from the spinal cord to the body's muscles.

Spinal Nerves

Nerves that emerge from the spinal cord and branch out to innervate different parts of the body.

Motor Neurons

Neurons that carry signals from the spinal cord or brain to effectors (muscles or glands) to trigger movement or action.

Patellar Reflex

A knee jerk reflex triggered by tapping the patellar tendon, used to test the neural circuits within the spinal cord.