Statıstıcs I Final 6. Deneme Sınavı

Toplam 20 Soru
PAYLAŞ:

1.Soru

Which level of measurement is not suitable for Median


Continuous

Discrete

Interval

Nominal

Ratio


2.Soru

Which class interval is containing the median?


0 up to 20

20 up to 40

40 up to 60

60 up to 80

80 up to 100


3.Soru

Which of the followings are not correct related to probability density function?


In order to calculate the area under a probability function between two points by utilizing probability density function, f (x).

The probability density function f (x), defines the physical characteristics of the random variable.

The probability density function determines the shape of the distribution for the continuous random variable X.

The area under the probability density function f (x) is always equivalent to 3.

Probability density function is represented by f (x).


4.Soru

The above table contains the daily sales data of a market. We want to construct relative frequency distribution table for the data. What is the first class’ relative frequency?


0,32

0,47

0,53

0,60

0,64


5.Soru

Which statements below are correct?

I Exponential distribution is a type of a discrete random variable.

II Discrete random variables have only a countable number of distinct values.

III A discrete random variable typically comprises of a counting concept.

IV Continuous random variables represent entire infinite values in an interval.

V Continuous random variables are commonly measured instead of counted.


I, II, III, IV

I, II, III, V

II, III, IV, V

I, III, IV, V

Only I


6.Soru

X=x

1

2

3

4

P(X=x)

0,20

0,30

0,30

0,20

Which of the following is the standard deviation of the given data above?


1.9

1.95

2

2.015

2.0615


7.Soru

Which of the following is a measure of the midpoint or center of the probability distribution?


Mean

Median

Mode

Variance

Range


8.Soru

The above table contains the daily sales data of a market. We want to construct grouped frequency distribution table for the data. What is the class width of the data?


80

90

100

110

120


9.Soru

Assume that 20 percent of Statistics course students in Anadolu University take Music course, 10 percent take Swimming course, and 4 percent take both Music and Swimming courses. What percentage of Statistics students neither take Music nor Swimming course?


80

74

70

66

34


10.Soru

During a sales season, the fifteen salesmen in a computer company sold the following numbers of computers: 7, 11, 5, 12, 17, 6, 13, 9, 8, 4, 23, 12, 7, 6, 11.

Which of followings is the range of the number of sold computers?


R = 23 - 4 = 19

R = 4 - 23 = 19

R = 19 - 7 = 23

R = 11 - 5 = 19

R = 12 - 8 = 23


11.Soru

A engineer wants to choose the best company to work for. Before choosing the company, he classifies the companies according to their location and salary offered. There are 12 different locations and  10 different salaries. In how many different ways can companies be classified? 


22

220

2200

120

1200


12.Soru

If one wants to model the number of customers entering to a fast food restaurant per hour, which probability distribution should he/she use?


Poisson

Binomial

Hypergeometric

Continious

Bernoulli


13.Soru

Which one is frequently used to summarize the features of probability distributions for a discrete random variable X?


Hypergeometric distribution

Binomial distribution

Arithmetic mean and variance

Probability distribution

Cumulative distribution


14.Soru

The probability of an event A is 0.6, the probability of an event B is 0.3. The probability that neither A nor B occurs is 0.25. What is the probability that both A and B occurs?


0.35

0.30

0.25

0.20

0.15


15.Soru

Which of the followings is the most important and widely used measure of variability in statistics ?


Range

Percentiles

Standard Deviation

Interquartile Range

Variance


16.Soru

Which one is a widely employed discrete probability distribution in statistics where a set of independent observations constitutes exactly two disjoint outcomes of a trial?


Hypergeometric distribution

Binomial distribution

Poisson distribution

Probability distribution

Cumulative distribution


17.Soru

The box plot is given above shows the data about the number of hours spent on watching tv a day by students in a school.

Which of the following is not correct about the box plot data?


The median is two hours.

The interquartile range is three hours.

50% of the people watch three hours of TV a day.

The shape of the distribution is left-skewed.

There are outliers in the data.


18.Soru

Let's assume that three perfect coins are flipped three times, what is the probability that all the results are head?


2/9

3/8

2/4

1/8

1/16


19.Soru

A manager of a café in a university campus assesses its customers as student, academic staff or visitor. She estimates that of all its customers 50% are students, 30% are academic staff and that 20% are visitors. It is known that purchases are made by 70% of student customers, by 60% of academic staff and by 30% of visitors. If a randomly chosen customer makes a purchase, what is the probability that this customer is a student?


0,74

0,54

0,59

0,95

0,059


20.Soru

A company works with two supplier firms for the same raw material. The first firm's late delivery probability on a given day is 0.05, whereas for the second firm this probability is 0.07. In addition, both firms' late delivery probability on given day is 0.04. What is the late delivery probability of at least one of the firms to company on given day?


0.05

0.06

0.07

0.08

0.09