MATH9C

Question 1

is a way of getting information from
data.

Answer 1

Statistics

Question 2

Facts,
especially numerical
facts, collected
together for
reference or
information

Answer 2

Data

Question 3

Knowledge
communicated
concerning some
particular fact.

Answer 3

Information

Question 4

is a tool for creating new understanding from data

Answer 4

Statistics

Question 5

Two Ways to Do Statistics

Answer 5

Inferential statistics and Descriptive statistics

Question 6

methods of organizing, summarizing,
and presenting data in a convenient and informative way. These
methods include graphical summaries and numerical
techniques.

Answer 6

Descriptive statistics

Question 7

methods used to make conclusions or
inferences concerning some unknown aspect of a population
based on data from a sample. Statistical inference is the process
of making an estimate, prediction, or decision about a population
based on a sample.

Answer 7

Inferential statistics

Question 8

collection of all
possible individuals,
objects, or
measurements of
interest;

Answer 8

population

Question 9

is a
numerical
measurement
describing some
characteristic of a
population.

Answer 9

parameter

Question 10

a portion, or part, of the population
of interest

Answer 10

sample

Question 11

a numerical
measurement describing some characteristic
of a sample.

Answer 11

Statistic

Question 12

Two branches of statistics

Answer 12

Descriptive statistics and Inferential statistics

Question 13

Survey

Answer 13

Collect data

Question 14

Tables and graphs

Answer 14

Present data

Question 15

Sample mean

Answer 15

Summarize data

Question 16

Estimate the population
mean weight using the sample
mean weight

Answer 16

Estimation

Question 17

Test the claim that the
population mean weight is 120
pounds

Answer 17

Hypothesis testing

Question 18

the process of drawing conclusions or
making decisions about a population based on
sample results

Answer 18

Inference

Question 19

the collection of all items of interest or
under investigation

Answer 19

population

Question 20

an observed subset of the population

Answer 20

sample

Question 21

a specific characteristic of a population

Answer 21

parameter

Question 22

a specific characteristic of a sample

Answer 22

statistic

Question 23

Values calculated using
population data are called

Answer 23

parameters

Question 24

Values computed from
sample data are called

Answer 24

statistics

Question 25

a procedure in which ◼ each member of the population is chosen strictly by chance, ◼ each member of the population is equally likely to be chosen, and ◼ every possible sample of n objects is equally likely to be chosen

Answer 25

Simple random sampling

Question 26

The resulting sample is called

Answer 26

random sample

Question 27

Greek letter sigma, indicates a sum and is referred as a summation operation

Answer 27

∑

Question 28

is referred to as the index of summation or summation variable

Answer 28

i

Question 29

the i th term of the sum

Answer 29

xi

Question 30

lower and upper limits of the summation, respectively

Answer 30

1, n

Question 31

a table that shows classes or intervals of data with a count of the number in each class. The frequency f of a class is the number of data points in the class

Answer 31

frequency distribution

Question 32

the distance between lower (or upper) limits of consecutive classes.

Answer 32

class width

Question 33

the difference between the maximum and minimum data entries

Answer 33

range

Question 34

a class is the sum of the lower and upper limits of the class divided by two. The midpoint is sometimes called the class mark

Answer 34

midpoint

Question 35

a class is the portion or percentage of the data that falls in that class. To find the relative frequency of a class, divide the frequency f by the sample size n

Answer 35

relative frequency

Question 36

a class is the sum of the frequency for that class and all the previous classes.

Answer 36

cumulative frequency

Question 37

a bar graph that represents the frequency distribution of a data set.

Answer 37

frequency histogram

Question 38

the numbers that separate the classes without forming gaps between them

Answer 38

Class boundaries

Question 39

a line graph that emphasizes the continuous change in frequencies.

Answer 39

frequency polygon

Question 40

the same shape and the same horizontal scale as the corresponding frequency histogram.

Answer 40

relative frequency histogram

Question 41

Measure of central tendency provides a very convenient way of describing a set of scores with a single number that describes the_______of the group

Answer 41

PERFORMANCE

Question 42

It is also defined as a single value that is used to describe the______of the data

Answer 42

center

Question 43

There are three commonly used measures of central tendency

Answer 43

MEAN ▪ MEDIAN ▪ MODE

Question 44

MEAN It is the most commonly used measure of the center of data ▪ It is also referred as the____

Answer 44

arithmetic average

Question 45

the data or scores that are arranged in a frequency distribution

Answer 45

Grouped data

Question 46

the arrangement of scores according to category of classes including thefrequency

Answer 46

Frequency distribution

Question 47

the number of observations falling in a category

Answer 47

Frequency

Question 48

One formula in solving the mean for grouped data is called

Answer 48

midpoint method.

Question 49

Median is what divides the scores in the distribution into two equal parts. • Fifty percent (50%) lies below the median value and 50% lies above the median value. • It is also known as the______or the 50th percentile.

Answer 49

middle score

Question 50

When the _____ value is desired.

Answer 50

typical