Need Help-Statistics


Need Help-Statistics

W4 Quiz

Question 1

  1.  

Parameters are

numerical characteristics of a sample
numerical characteristics of a population
the averages taken from a sample
numerical characteristics of either a sample or a population

Question 2

  1.  

Stratified random sampling is a method of selecting a sample in which

the sample is first divided into strata, and then random samples are taken from each stratum
various strata are selected from the sample
the population is first divided into strata, and then random samples are drawn from each stratum
None of these alternatives is correct.

Question 3

  1.  

A theorem that allows us to use the normal probability distribution to approximate the sampling distribution of sample means and sample proportions whenever the sample size is large is known as the

approximation theorem
normal probability theorem
central limit theorem
central normality theorem

Question 4

  1.  

In point estimation

data from the population is used to estimate the population parameter
data from the sample is used to estimate the population parameter
data from the sample is used to estimate the sample statistic
the mean of the population equals the mean of the sample

Question 5

  1.  

The sample statistic s is the point estimator of

μ
σ
x ̅
p

Question 6

  1.  

The sample mean is the point estimator of

μ
σ
x ̅
p-

Question 7

  1.  

The standard deviation of all possible x ̅ values is called the

standard error of proportion
standard error of the mean
mean deviation
central variation

Question 8

  1.  

A sample statistic, such as a sample mean, is known as

a statistic
a parameter
the mean deviation
the central limit theorem

Question 9

  1.  

The purpose of statistical inference is to provide information about the

sample based upon information contained in the population
population based upon information contained in the sample
population based upon information contained in the population
mean of the sample based upon the mean of the population

Question 10

  1.  

Random samples of size 81 are taken from an infinite population whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

200 and 18
81 and 18
9 and 2
200 and 2

Need Help-Statistics

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: