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İST209U

İSTATİSTİK I

2019-2020 Dönem Sonu Sınavı TB6-2-8
Soru 1
I. Online electronic commerce

II. Amount of daily drug sales a pharmacy in
Eskişehir

III. Transport in the airline industry

Soru 2

------- is a field that includes Statistics as well as areas such as Computer Science, Database Management and Data Visualition.



Which of the following completes the sentence above?

Soru 3
The variable is defined as ------- if the outcomes are nonnumeric qualities or attributes.”
Soru 4
I. The direct recording of the data avoids
problems.

II. The individuals included in the study might be
aware of this fact and then altered their
behavior, decision or answers.

III. The observer or the instrument to be used for
data gathering must be able to record the
events correctly.

Soru 5
Soru 6
Histograms are drawn for -------.

Which of the following completes the sentence above?

Soru 7
Data set: 4, 4, 4, 6, 6, 8, 8, 11, 11, 13
Soru 8
The ------- is the differences between the third and the first quartiles.

Which of the following completes the sentence above?

Soru 9
Soru 10

The products in a warehouse are arranged “Whole (W)” and “Broken (B)”



Which of the following is list of possible results of experiment that is “Random selection of two of these products”?

Soru 11

What is the C(10,8) ?

Soru 12

A and B are independent events. A is 0.5 whereas the probability of an event B is 0.4.



What is the probability that either A and B occurs?

Soru 13
X x

0

1

2

3

P(X x)

0.25

0.55

k

0.05

Soru 14
Soru 15

If X Binomial (n, p) and n 5, p 0.3 what is P(X 3) ?

Soru 16
I. The travel time of a bus between two cities.

II. The number of magazine sold on aspecific
date.

III. The call center phone call waiting times.

IV. The water level in a certain pond.

Soru 17

Consider that continuous random variable X is uniformly distributed and takes values 20 and 40.

What is the mean of this continuous random variable X?

Soru 18
Classes

Frequency

2 - 4

9

4 - 6

17

6 - 8

24

8 - 10

16

10 - 12

6

Total

72

What is the median given grouped frequency distribution?

Soru 19
Raw data: 16, 27, 14, 18, 19, 30, 28, 33, 15, 16, 34, 12, 16, 12, 13, 23, 24, 33, 16, 17, 18, 17, 27, 12
Soru 20

Suppose random variable X has an exponential distribution with λ=0.04.


What is the mean of this variable?