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

Soru 1:

A jar contains 4 blue, 5 yellow, and 6 pink balls. If 3 balls are selected randomly, without replacement, what is the probability that the 4th ball selected is blue, given that the first 3 balls are blue, pink, yellow, respectively ?

A) 0.15 B) 0.20 C) 0.25 D) 0.30 E) 0.35

Soru 2:

What do we call average number of values?

A) Median deviation B) Arithmetic mean C) Mode D) Standard deviation E) Binom number

Soru 3:

Data format : (class interval, frequency) data : (100 up to 120, 1), (120 up to 180, 2), (180 up to 200, 1), (200 up to 250, 1). What is the sample standard deviation of these data ?

A) 4.8501/2/ 3 B) 7.5251/2/ 2 C) 8.8751/2/ 3 D) 6.6751/2/ 2 E) 9.6251/2/ 3

Soru 4:

Which of the following is not true about skewness?

A) A negative value near -3 shows that the distribution is considerably right-skewed. B) The skewness gives information about the shape of the distribution. C) If the distribution is unimodal, the mean, median and mode are the same. D) If the distribution is left-skewed, having a long tail in a negative direction and a single peak E) Pearson’s coefficient of skewness (PCS) can take values between -3 and 3.

Soru 5:

During a festival, the five bar tenders in the festival area sold the following number of beers in three days : 9540, 3600, 5566, 12345 and 8745. What is the range of the beers sold during the festival?

A) 12345 B) 9540 C) 8745 D) 5566 E) 3600

Soru 6:

What is the set of all possible outcomes in a random experiment called?

A) Sample space B) Elementary outcome C) Basic outcomes D) Event E) Subset of a sample

Soru 7:

Frequently used to model the time interval between two events It is essential to use consistent time units in the determination of probabilities The mean and the standard deviation of the distribution are equal Which of the above is/are true for exponential distribution?

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

Soru 8:

Events A, B, and C are all independent and that B and C are mutually exclusive events. P(A)=0.04, P(B)=0.03, and P(C)=0.02. What is the probability that events A and B will occur or A will not occur and C will occur?

A) 0.0096 B) 0.0128 C) 0.0144 D) 0.0204 E) 0.0256

Soru 9:

The exam points of the students in a math class as follows; 45,53,67,74,88,88,95,95,100. Which of the following is the standard deviation of the data?

A) 20 B) 18,75 C) 12,19 D) 19,72 E) 18

Soru 10:

Which of the following properties is not valid related to probability density function f (x) for normal distribution?

A) If x1 ≤ x2 then F (x1) ≤ F (x2) B) ∫∞ f(x)dx=1 C) The normal distribution function curve is symmetric around the mean, μ. D) The probability density function f (x) does not the touch and intersect x axis. E) f (x) ≥ 0 for all x values.

Soru 11:

The data on weight distribution of a certain group of men is given on the table above. What is the mean weight for this group?

A) 71 B) 73 C) 75 D) 80 E) 81

Soru 12:

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 50 th percentile of the data?

A) 6,5 B) 7,5 C) 8,5 D) 9,5 E) 10,5

Soru 13:

60 % of students take Statistics 2 course after Statistics 1 course. 25 % of students takes Statistics 2 course without taking Statistics 1 course. What is the probability that a student who takes Statistics 2 course has not taken Statistics 1 course?

A) 0.15 B) 0.25 C) 5 / 12 D) 12 / 17 E) 5 / 17

Soru 14:

Which of the following is a feature of Bayes’ Theorem? I.Using Bayes’ Theorem, we can find the probability that a defective item is produced by a particular machine. II.It enables us to compute a particular conditional probability. III. It is defined as the arrangements of a finite number of distinct objects.

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

Soru 15:

Which of the following is not true for normal distribution?

A) It provides basis for the statistical inference B) It is also called as "uniform distribution" C) It is a symmetric distribution where random variable values are uniformly scattered around mean D) Population mean has an effect on the shape of its function E) Standard deviation has an effect on the shape of its function

Soru 16:

According to the properties that probability density function f(x) of normal distribution has, which of the following is not true?

A) Probability density function of random variable x obtain the non-negativevalues at all times B) Probability density function, f (x) decreases as the random variable value goes away from the mean, µ C) The area under the probability density function f (x) always equivalent to 1 in the definition interval of the random variable X D) Normal distribution curve has a similar shape on both sides of the mean x=µ E) The left tail of the probability function touches the x axis at point 1

Soru 17:

What is the arithmetic mean of the following discrete probablity distribution?

A) 0.50 B) 0.75 C) 1.25 D) 1.75 E) 2.25

Soru 18:

When is A and B, which are any two events in a random experiment with sample space S, can be said to be mutually exclusive?

A) A ∪ B = 0 B) A ∩ B = 0 C) A ∩ B = A D) A ∩ B = A ∪ B E) A ∪ B = A

Soru 19:

Which type of plot is used to display the relationship between two sets of variables or to make comparisons between two sets of data points?

A) Line chart B) Pie chart C) Histogram D) Stem-And-Leaf Display E) Scatter Plot