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

Soru 1:

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

A) 12 B) 14 C) 16 D) 18 E) 20

Soru 2:

Some of the illustrations of random variables that generally conform to model by means of Poisson distribution are presented below.Which illustration does NOT conform to this model?

A) The number of customers served by automated teller machine in a day. B) The amount of time that customers spent using the automated teller machine in a day C) The number of patients in the hospital on a given day D) The number of diseased strawberry plants in ten acres field E) The number of telephone calls received by a technical support center in a week.

Soru 3:

____________________ random variables have only a countable number of separate values such as 0, 1, 2 , 3... etc.?

A) Continuous B) Ratio C) Interval D) Discrete E) Distinct

Soru 4:

In how many different ways can the letters in P R O B A B I L I T Y be arranged?

A) 11 B) 55 C) 66 D) 110 E) 11!

Soru 5:

Pdf for continuous random variable X is defined as follows; f (x) = 0.02, for 0 ≤ x ≤ 50. What is he variance of the continuous random variable X?

A) 833.33 B) 208.33 C) 104.167 D) 250.5 E) 0.02

Soru 6:

What will be the probability P(2.5

A) 0.1 B) 0.2 C) 0.3 D) 0.4 E) 0.6

Soru 7:

What is the midrange of the following data set with frequency in paranthesis? 15 (2), 25 (4), 38 (3), 44 (3), 64 (3), 105 (2)

A) 105 B) 64 C) 60 D) 44 E) 25

Soru 8:

In a discrete probability distribution, The sum of the probabilities of each outcome of the random variable must equal to ___________ ?

A) 0.1 B) 0.4 C) 0.7 D) 0.9 E) 1

Soru 9:

Find out the mode in the following data set: 30, 30, 40,40 50,50,65,65,80,80,80

A) 30 B) 40 C) 50 D) 65 E) 80

Soru 10:

f (x) ? 0 for all x values The normal distribution function curve is symmetric around the mean, µ The probability density function f (x) does not the touch and intersect x axis Which of the above is/are the properties that probability density function f (x) of normal distribution has?

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

Soru 11:

In order to investigate the impact of playing online games on developing English speaking skills, we make a group of students play online games for four hours a day and prevent another group of students playing any English online games. What type of research we are conducting?

A) Case B) Sampling C) Observational D) Experimental E) Interval

Soru 12:

Which of the following is not big data?

A) Eskişehir’s food order website’s visitor traffic B) internet traffic of Eskişehir Train Station Free Wi-Fi C) phone call traffic in Eskişehir D) Anadolu University TV's broadcast E) Eskişehir Yunus Emre Hospital's user traffic

Soru 13:

Consider an ultrasound software for brain tumor diagnosis : a) the overall rate of the disease in the population being screened is 1 % ; b) the probability that a healthy person wrongly gets a positive result (false positive) is 0.05 ; c) the probability that an ill wrongly gets a negative result (false negative) is 0.002 ; d) other 2 situations are correctly diagnosing healthy persons (true negative) and correctly diagnosing ills (true positive). If test of a person A gives a positive result, what is the probability that person A actually have the disease?

A) 0.0495 B) 0.998 * 0.01 / 0.05948 C) 0.06 D) 0.099 * 0.02 / 0.064 E) 0.095

Soru 14:

Which of the followings is not true regarding "range"?

A) In order to find the range of a data set, researcher need to identify only two characteristics, the largest and smallest values. B) Although the range is easy to calculate and to understand, it is generally not a very useful measure of variability. C) The disadvantage of the range is that it depends only on the highest and lowest observations. D) The range of a data set is the difference between the largest and smallest values. E) In grouped frequency distribution, the value of the range will only be the lowest value.

Soru 15:

The frequency distribution table of the students’ performance scores of a school were constructed as follows. What is the sample mean of the data?

A) 52,4 B) 53 C) 54,5 D) 55 E) 56,8

Soru 16:

The standard deviation of the students’ performance scores data is 20. What is the variance of the data?

A) 350 B) 360 C) 370 D) 380 E) 400

Soru 17:

Consider the random experiment of tossing a fair coin until a tail (T) and a head (H) show up once. Describe the sample space of this random experiment ?

A) S = {H, T} B) S = {HH, HT, TH, TT} C) S = {HT, HT, HHT, HHHT} D) S = {HT, TH, HHT, TTH, HHHT, ... } E) S = {HT, TH, HHT, THH, HHHT, ... }

Soru 18:

The probability that Navigator A shows wrong way to an address is 0.09 and the probability that Navigator B shows wrong way to the same address is 0.07 and the probability that both Navigators show wrong way to the same address is 0.04. What is the probability that only one of the Navigators shows wrong way to the same address?

A) 0.16 B) 0.14 C) 0.12 D) 0.10 E) 0.08

Soru 19:

X=x 1 2 3 4 P(X=x) 0,20 0,30 0,30 0,20 Which of the following is the mean of given data above?

A) 1 B) 2 C) 2,5 D) 3 E) 3,5

Soru 20:

X=x 1 2 3 4 P(X=x) 0,20 0,30 0,30 0,20 Which of the following is the variance of given data above?

A) 4 B) 4.25 C) 4.15 D) 4.20 E) 4.50