Stats

The purpose of statistical inference is to make estimates or draw conclusions about a

population based upon information obtained from the sample.

An estimate of a population parameter that provides an interval of values believed to contain the value of the parameter is known as the _____

interval estimate

What is the total area under the normal distribution curve?

1

Two events are independent if

P(A| B) = P(A) or P(B | A) = P(B).

The _________ probability distribution can be used to estimate the number of vehicles that go through an intersection during the lunch hour

Poisson

Which of the following statements is correct?

The binomial distribution is a discrete probability distribution and the normal distribution is a continuous probability distribution.

The basis for using a normal probability distribution to approximate the sampling distribution of the sample means and population mean is _____

The central limit theorem

Which of following distribution is not defined by the probability mass function (PMF)?

Normal probability distribution

For a continous random variable x, the probability distribution is defined by. ______ denoted by f(x)

probability density function

We make several observations about the characteristics of the normal distribution. For example, _______ of the values of a normal random variable are within plus or minus two standard deviations of its mean.

95.4%

As the number of degrees of freedom for at distribution increases, the difference between the t distribution and the standard normal distribution_____

Becomes smaller

Given an event A, the _____ of A is defined to be the event consisting of all outcomes that are not in A

Complement

Which of the following is not a characteristic of the normal probability distribution?

The standard deviation must be 1

Probability is the

a numerical measure of the likelihood that an event will occur

If the expected value of the sample statistic is equal to the population parameter being estimated, the sample statistic is said to

be an unbiased estimator of the population parameter.

A larger standard deviation for a normal distribution with an unchanged mean indicates that the distribution becomes

flatter and wider

A random sample selected from an infinite population is a sample selected such that each element selected comes from the same _______ and each element is selected ______

population; independently

Bayes' theorem is a method used to compute __________ probabilities.

posterior (revised)

The value of the ___________ is used to estimate the value of the population parameter.

sample statistic

A _______ determines how far a particular value is from the mean relative to the data set's standard deviation.

z-score