Reference no: EM131257868

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.