Stats Unit 5 Test

Front

What is the area under the standard normal curve between z = -1.55 and z = 1.04?

Back

0.790

Front

What is the area under the standard normal curve to the left of z = 1.25?

Back

0.894

Front

What is the probability that the mean room and board is less than $7800 if the mean is $7540 and standard deviation is $1245 for a sample of 9 colleges?

Back

0.735

Front

How do you write the binomial probability P(X ≥ 10) as a normal probability using continuity correction?

Back

P(X > 9.5)

Front

When can you use a normal distribution to approximate a binomial distribution?

Back

You can use it if np ≥ 5 and nq ≥ 5.

Front

What is the mean (μ) and standard deviation (σ) for a binomial experiment where 61% of adults look online for health information and 15 adults are surveyed?

Back

μ=9.15, σ=1.89

Front

Define the standard normal distribution.

Back

A normal distribution with a mean of 0 and a standard deviation of 1.

Front

What is the purpose of continuity correction in statistics?

Back

To improve the approximation of a discrete distribution by a continuous distribution.

Front

What does the z-score represent in a normal distribution?

Back

The z-score indicates how many standard deviations an element is from the mean.

Front

How do you calculate the z-score for a given value in a normal distribution?

Back

z = (X - μ) / σ, where X is the value, μ is the mean, and σ is the standard deviation.