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Ch. 5 - Normal Probability Distributions
Larson - Elementary Statistics: Picturing the World 8th Edition
Larson8th EditionElementary Statistics: Picturing the WorldISBN: 9780137493470Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoLarson 8th EditionCh. 5 - Normal Probability DistributionsProblema 5.5.10
Capitolo 5, Problema 5.5.10

In Exercises 9–14, write the binomial probability in words. Then, use a continuity correction to convert the binomial probability to a normal distribution probability.


P(x ≥ 110)

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Step 1: Write the binomial probability in words. The problem asks for the probability that the random variable X is greater than or equal to 110. In words, this means 'the probability that the number of successes is at least 110.'
Step 2: Recall that a binomial distribution can be approximated by a normal distribution when the sample size is large and both np and n(1-p) are greater than or equal to 5. Verify these conditions for the given problem.
Step 3: Apply the continuity correction. Since the binomial distribution is discrete and the normal distribution is continuous, adjust the boundary for P(x ≥ 110) to P(x ≥ 109.5) in the normal distribution.
Step 4: Standardize the value using the z-score formula for a normal distribution: z = (x - μ) / σ, where μ = np (mean) and σ = √(np(1-p)) (standard deviation). Substitute the values of n (sample size), p (probability of success), and x = 109.5 into the formula.
Step 5: Use the standard normal distribution table or a statistical software to find the probability corresponding to the calculated z-score. This will give the approximate probability for the binomial distribution using the normal approximation.

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Binomial Probability

Binomial probability refers to the likelihood of obtaining a fixed number of successes in a fixed number of independent Bernoulli trials, each with the same probability of success. It is calculated using the binomial formula, which incorporates the number of trials, the number of successes, and the probability of success. In this context, P(x ≥ 110) represents the probability of achieving 110 or more successes.
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Calculating Probabilities in a Binomial Distribution

Normal Distribution

The normal distribution is a continuous probability distribution characterized by its bell-shaped curve, defined by its mean and standard deviation. It is often used to approximate the binomial distribution when the number of trials is large, due to the Central Limit Theorem. This approximation allows for easier calculations of probabilities, especially when dealing with large sample sizes.
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Using the Normal Distribution to Approximate Binomial Probabilities

Continuity Correction

Continuity correction is a technique used when approximating a discrete probability distribution, like the binomial, with a continuous distribution, such as the normal distribution. It involves adjusting the discrete value by 0.5 to account for the fact that the normal distribution is continuous. For example, to find P(x ≥ 110) in a normal approximation, one would calculate P(x > 109.5) to ensure a more accurate representation of the binomial probability.
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Using the Normal Distribution to Approximate Binomial Probabilities
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