Lecture 6

Question 1

The normal distribution is sometimes called the

Answer 1

BELL CURVE

Question 2

The normal distribution is also known as the

Answer 2

GAUSSIAN DISTRIBUTION

Question 3

Who is the German mathematician who first described the normal distribution?

Answer 3

Carl Friedrich Gauss

Question 4

It is a probability function that describes how
the values of a variable are distributed

Answer 4

NORMAL DISTRIBUTION

Question 5

The red curve is a model called the

Answer 5

NORMAL CURVE

Question 6

a variable that can take on an infinite number of values within a specific interval

Answer 6

CONTINUOUS RANDOM VARIABLE

Question 7

Other term for normally distributed

Answer 7

NORMAL PROBABILITY DISTRIBUTION

Question 8

A normal random variable having mean = 0, and standard deviation = 1

Answer 8

STANDARD NORMAL RANDOM VARIABLE

Question 9

What do you call the density curve of the standard normal random variable?

Answer 9

STANDARD NORMAL CURVE

Question 10

The normal random variable of a standard normal distribution is called a

Answer 10

STANDARD SCORE / Z-SCORE

Question 11

is a family of distributions that look
almost identical to the normal distribution curve, only a bit shorter and fatter

Answer 11

T-DISTRIBUTION / STUDENT’S T-DISTRIBUTION

Question 12

number of values in the final calculation of a statistic that are free to vary

Answer 12

DEGREES OF FREEDOM

Question 13

s the average of the given numbers and is calculated by dividing the sum of given numbers by the total number of numbers

Answer 13

MEAN

Question 14

measure of the amount of variation of the values of a variable about its mean

Answer 14

STANDARD DEVIATION

Question 15

It is the process of generalizing
information obtained from a sample to a
population

Answer 15

INFERENTIAL STATISTICS

Question 16

Sample data are used to estimate the value
of unknown parameters such as μ or σ.

Answer 16

ESTIMATION

Question 17

single points that
are used to infer parameters directly

Answer 17

POINT ESTIMATION

Question 18

also called
confidence interval for parameter

Answer 18

INTERVAL ESTIMATION

Question 19

provides more information than point estimates and it consist of an interval of numbers

Answer 19

CONFIDENCE INTERVAL

Question 20

presents the expected proportion of intervals that will contain the parameter if a large number of different samples is obtained

Answer 20

LEVEL OF CONFIDENCE

Question 21

is a procedure on sample evidence and probability, used to test claims regarding a characteristic of one or more populations

Answer 21

HYPOTHESIS TESTING

Question 22

A statement or claim regarding a characteristic of one or more populations

Answer 22

HYPOTHESIS

Question 23

Assumed true until evidence indicates otherwise

Answer 23

NULL HYPOTHESIS

Question 24

Sometimes referred to as the research hypothesis

Answer 24

ALTERNATIVE HYPOTHESIS

Question 25

results from an alternative hypothesis which specifies a direction

Answer 25

ONE-TAILED TEST

Question 26

will test both if the mean is significantly greater than x and if the mean significantly less than x

Answer 26

TWO-TAILED TEST

Question 27

the probability of rejecting a null hypothesis when it is true

Answer 27

ALPHA LEVEL / SIGNIFICANCE LEVEL

Question 28

a false positive that occurs when a researcher rejects a true null hypothesis

Answer 28

TYPE I ERROR

Question 29

occurs when a researcher fails to reject the null hypothesis when it is false

Answer 29

TYPE II ERROR

Question 30

is a branch of statistics which leverages models based on a fixed set of parameters

Answer 30

PARAMETRIC STATISTICS

Question 31

does not make any assumptions and measures the central tendency with the median value

Answer 31

NON-PARAMETRIC STATISTICS

Question 32

is the set of all values of the test statistic which will lead to the rejection of null hypothesis

Answer 32

CRITICAL REGION

Question 33

is the set of all values of the test statistic that leads the researcher to retain null hypothesis

Answer 33

ACCEPTANCE REGION