Assignment
QUESTION 1
A portion of the population selected to represent the population is called??
statistical inference?
Data and Statistics?
a census?
a sample
QUESTION 2
The process of analyzing sample data in order to draw conclusions about the characteristics of a population is called??
Data and Statistics?
statistical inference?
data analysis?
data summarization
QUESTION 3
A numerical value used as a summary measure for a sample, such as sample mean, is known as a??
population parameter?
sample parameter?
sample statistic?
population mean
QUESTION 4
The set of all possible sample points (experimental outcomes) is called??
a sample?
an event?
the sample space?
a population
QUESTION 5
A numerical description of the outcome of an experiment is called a??
descriptive statistic?
probability function?
variance?
random variable
QUESTION 6
A description of the distribution of the values of a random variable and their associated probabilities is called a??
probability distribution?
random variance?
random variable?
expected value
QUESTION 7
Which of the following is not a characteristic of the normal probability distribution???
The mean, median, and the mode are equal?
The mean of the distribution can be negative, zero, or positive?
The distribution is symmetrical?
The standard deviation must be 1
QUESTION 8
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 9
The value added and subtracted from a point estimate in order to develop an interval estimate of the population parameter is known as the??
confidence level?
margin of error?
parameter estimate?
interval estimate
QUESTION 10
Whenever the population standard deviation is unknown and the population has a normal or near-normal distribution, which distribution is used in developing an interval estimation???
standard distribution?
z distribution?
alpha distribution?
t distribution
QUESTION 11
The level of significance??
can be any positive value?
can be any value?
is (1 - confidence level)?
can be any value between -1.96 to 1.96
QUESTION 12
When the p-value is used for hypothesis testing, the null hypothesis is rejected if??
p-value ≤ α?
α < p-value?
p-value ≥ α?
p-value = 1 - α
QUESTION 13
The p-value is a probability that measures the support (or lack of support) for the??
null hypothesis?
alternative hypothesis?
either the null or the alternative hypothesis?
sample statistic
QUESTION 14
The coefficient of correlation??
is the square of the coefficient of determination?
is the square root of the coefficient of determination?
is the same as r-square?
can never be negative
QUESTION 15
Regression analysis is a statistical procedure for developing a mathematical equation that describes how??
one independent and one or more dependent variables are related?
several independent and several dependent variables are related?
one dependent and one or more independent variables are related?
None of these alternatives is correct.