Statıstıcs I Çıkmış Sorular, Online Deneme Sınavları, Çalışma, Dersler, Sınava Hazırlanma, vize, final

Soru 1:

Probability density function for continuous random variable X is defined as follows; f(x) = 0.02, for 0 ? x ? 50 Which of the following mean of the continuous random variable X?

A) 25 B) 50 C) 60 D) 80 E) 150

Soru 2:

Arithmetic mean Standard deviation Variance Which of the above determine(s) the shape of the normal random variable?

A) Only III B) I and II C) I and III D) II and III E) I, II and III

Soru 3:

A bakery employs 10 people. The number of years’ experience that the employees of the company have is the following: 0, 0, 2, 4, 5, 8, 15, 17, 20, 24. What is the interquartile range of the data?

A) 10 B) 15 C) 20 D) 25 E) 30

Soru 4:

In binomial distribution, "The probability of success, denoted by and the probability of failure, denoted by remains _____________ for all trials"?

A) different B) changes trial to trial C) constant D) variable E) fluctuates

Soru 5:

What is ' the most frequent value in the entire data' called?

A) Trimmed mean B) Median C) Geometric mean D) Mode E) Arithmetic mean

Soru 6:

In a study about employess, employees are classified according to the department they work in and their preference of training coursec. If there are 12 different departments and 7 different courses, in how many different ways can an employee be classified?

A) 72 B) 19 C) 84 D) 12 E) 7

Soru 7:

Which option is NOT correct about the probability density function?

A) Probabilities in continuous random variables can be determined from the area under probability density function. B) The probability density functionf(x), defines the physical characteristics of the random variable. C) Probability density function basically determines the shape of the distribution for the continuous random variableX. D) The area under the probability density functionf(x) is always greater than 1. E) For a continuous random variableX, probability density functionf(x)³0 for allx.

Soru 8:

What is the variance of f(x) = x for 0 ? x ? 4 equal to?

A) 4 B) 8 C) 16 D) 32 E) 64

Soru 9:

Which one below gives us the difference between Dot slot and Stem-and-Leaf Display?

A) A stem-and-leaf display is a type of graph for listing the numerical data. B) In stem-and-leaf display the original numbers are kept. C) Stem-and-leaf display are drawn for continuous data. D) Stem-and-leaf display is usually used for categoricaldata. E) Stem-and-leaf is often used to display the trends in a continuous data over a period of time

Soru 10:

Consider the probability distribution for the random variable X given below and determine the probability of P (1.5 < X ? 4) =?

A) 0,4 B) 0,5 C) 0,35 D) 0,45 E) 0,70

Soru 11:

Which of the following is a discrete random variable?

A) The sitting time interval of students in a library. B) The weight of the books in a library. C) The heat of a library. D) The height of the students in a library. E) The blood pressures of the students in a library.

Soru 12:

Data : 12, 16, 10, 20, 12 ; what is the mean deviation of these data ?

A) 3.2 B) 4.6 C) 5.2 D) 4.4 E) 3.8

Soru 13:

I. The central tendency measure of the distribution II. A measure of the variability of the observations III. The information of the distribution shape Which pieces of information given above can be obtained from a box-plot?

A) Only I B) Only II C) I and II D) II and III E) I, II and III

Soru 14:

We have a box containing only red and blue balls. If we randomly pick up a ball from this box, it could only be either a red ball or a blue ball, the selected ball cannot be a ball of red and blue at the same time. The occurrence of one event dictates that none of the other events can occur at the same time. How is this event called?

A) Multiplication rule B) Statistically independent C) Empirical probability D) Subjective Probability E) Mutually exclusive

Soru 15:

I. The number of students in a class. II. The time spent on doing an assignment. III. The height of the students. IV. The number of laptops in a school. Which of the variables above is an example of a discrete random variable?

A) I and II. B) I and IV. C) All of them D) None of them E) II and III.

Soru 16:

For X which is a continuous random variable that is uniformly distributed and takes values between 3 and 9. What is the probability density function of the random variable X ?

A) f(x)=0 for 3≤x≤9f(x)=1/6 otherwise B) f(x)=1/6 for 3≤x≤9f(x)=0 otherwise C) f(x)=1/3 for 3≤x≤9f(x)=0 otherwise D) f(x)=1/2 for 3≤x≤9f(x)=0 otherwise E) f(x)=1/6

Soru 17:

For two sets A and B the probability of A is 0.15 and the probability of B is 0.25 if P(A|B) is equal to 0.30 what is the value of P(B|A)?

A) 0.05 B) 0.10 C) 0.125 D) 0.18 E) 0.5

Soru 18:

What is mode?

A) Middle number when the data is ordered from smallest to largest B) Interval scale C) Middle number when the data is ordered from largest to smallest D) Ratio Scale E) Most frequent value(s)

Soru 19:

A shop selling mobile phones has purchased four new mobile phones of the same brand and model. It is known that a mobile phone of this brand and model works without any problem for at least 2 years with probability 0.95. What is the probability that all three mobile phones will work without any problem for at least 2 years?

A) 0.95 B) 0.90 C) 0.85 D) 0.80 E) 0.75

Soru 20:

According to classical probability, when a fair dice is rolled, what is the probability of obtaining a number more than 4?

A) 0.167 B) 0.267 C) 0.333 D) 0.433 E) 0.555