Statistics Exam

Sample

A part of a population is called a

Descriptive

The branch of statistics that consists of the collection, organization, summarization and presentation of data is called ……….. statistics

Nominal

Department is a/an …….. variable

Continuous

GPA is a/an …….. variable

Nominal

Blood type is a/an ……… variable

Discrete

Number of students in a STAT2013 class is a/an …….. variable

Continuous

Weight is a/an …….. variable

Nominal

Gender is a/an ……… variable

Continuous

Monthly salary is a/an ……….. variable

Random

In a …….. sample, all members have an equal chance of being selected

Systematic

In a ……… sample, every kth member of the population is selected

Range

The difference between the highest and lowest values of a dataset is called the ………

Relative frequency

The sum of the …….. of a frequency distribution always equals one

4

The class width for a dataset with 8 classes and a range of 27 is….

Histogram

Graph of vertical bars used to plot quantitative data

Range

Central tendency is mean quartile range and midrange

Which of the following is NOT a measure of central tendency?

Range

What is a measure of variation?

Parameter

A …… is a value computed using all the data values in a specific population

Statistic

A value computed using data values from a sample is called a ……

Mode

The value in a dataset that occurs the most is called ……

Bimodal

A dataset that has two modes is called ………

Symmetric

If mean = mode = median, the distribution is…..

22

Calculate the median for this dataset; 22,32,11,5,30 (5,11,22,30,32)

Population standard deviation

sigma (o) denotes the

Sample variance

S² denotes the

Mean

(includes- Min; Q1, Q2,/Median, Q3, Max)

Which of the following is NOT in the five-number summary

Outcome

The result of a single trial of a probability experiment is called an …..

Sample Space

The set of ALL possible outcomes of a probability experiment is called a/an ……

0;1

The probability of an event is between and including …….

0.25

Given that the probability of rain is 0.75, what is the probability it won’t rain?

0.5

What is the probability of getting an even number, when a fair die is rolled?

Mutually Exclusive

Two events are …….. if they can’t occur at the same time.

24

On the menu, there are 3 appetizers, 4 entrees and 2 sides. How many possible meals can be made?

2.5

A coin is tossed 5 times. Find the mean number of heads that will be obtained. F(x)=np ; =5(0.5) = 2.5

1

The sum of the probabilities in a discrete probability distribution equal …..

Unimodal

The normal curve is …..

68

Empirically, …… % of the data values fall within one standard deviation of the mean.

1

The total area under the curve is …

Two

Empirically, 95% of the data values fall within …. standard deviations of the mean.

0.0096

Find the probability using standard normal distribution, P (z<2.34)

0.2296

Find the probability using standard normal distribution, P(Z>0.74)

95%

The average score of students in an examination was 82 with a standard deviation of 5. If the scores are normally distributed, what percentage of the students scored between 72 and 92?

X hat

What statistic best estimates population mean?

0.01

Find the value of alpha that corresponds to a level of confidence of 99%.

Scatterplot

A graph used to check the relationship between two quantitative variables is called ….

Increases

A positive relationship between two variables means as x increases, y …….

r

denotes a correlation coefficient

Remain the same

If the values of x and y are interchanged, the value of r will