Final Sınavı - Statıstıcs I - sinavahazirlan.com

Soru 1:

Which of the following is not a nominal variable?

A) Exam grade B) Gender C) Region of residence D) Field of study E) Type of transport

Soru 2:

Which of the following is true about range?

A) The range of a data set is shown as R. B) Range is the difference between the largest and smallest values. C) It depends only on the highest and lowest observations. D) Range is heavily affected by these extremes values. E) Range informs about the variability of the observations.

Soru 3:

Which of the followings is generally demonstrated as P(m), where m is the number taking values between 0 and 100?

A) Range B) Percentiles C) Interquartile Range D) Variance E) Skewness

Soru 4:

According to the following cumulative distribytion function graph, what is the probability of x < -1?

A) 0.5 B) 0.4 C) 0.3 D) 0.1 E) 0

Soru 5:

What does this equation tell us?

A) A and B are closely related two events B) The events A and B intersects C) A and B are mutually exclusive D) A and B are complementary events E) A and B are union of events

Soru 6:

Which of the following is a measure of the dispersion or variability for data set for continuous random variables?

A) Mean B) Mode C) Median D) Variance E) Frequency

Soru 7:

Data format : (class, class interval, frequency, cumulative frequency) ; data : (1, 100 up to 200, 5, 5), (2, 200 up to 300, 10, 14), (3, 300 up to 400, 16, 30), (4, 400 up to 500, 20, 50), (5, 500 up to 600, 10, 60) ; what is the 40th percentile of these data ?

A) 355 B) 357.5 C) 360 D) 362.5 E) 365

Soru 8:

Which of the following is TRUE about symmetric bell-shape distributions?

A) Only the mean and median are the same value. B) The mean, median, and mode are all equal. C) The median falls between the mean and mode. D) The mean is smaller than median. E) The mode is larger than the mean.

Soru 9:

Consider that continuous random variable X is uniformly distributed and takes values between 10 and 50. Find the probability of P (15 < X < 25) ?

A) 0.10 B) 0.15 C) 0.20 D) 0.25 E) 0.30

Soru 10:

I. The mean is pulled in the direction of the tail. II. The median falls between the mode and the mean. III. The mean, median, and mode are all the same. If the distribution is left skewed, having a long tail in negative direction and a single peak, which of the statements above are true?

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

Soru 11:

Which of the followings cannot be given as an example for random experiments?

A) Rolling a fair die. B) Customers arriving at a particular store during some time interval. C) Airplanes taking off in a given time interval at some airport. D) Some particular customer requests in a bank. E) Surveying an elemanatry level english classroom.

Soru 12:

What is the geometric mean of the numbers 4, 25, 100 ?

A) 100 B) 102 C) 104 D) 106 E) 108

Soru 13:

Which of the following can be categorized as a discrete random variable?

A) Water consumption in a company B) The speed of a car in a certain area C) Weighs of a people in a population D) electricity consumption of a house E) The number of students in a class

Soru 14:

What is the area below the probability density function f (x) = 0.1, for 0 ? x ? 20 ?

A) 2 B) 3 C) 4 D) 5 E) 6

Soru 15:

"For binomial distribution, its principal assumptions are n independent trials with two possible outcomes (success or failure) for each trial, and the success probability remains constant for each trial. On the other hand __________ distribution doesn’t involve with independence assumption for each trial and accordingly the sampling process is established on without replacement. Because of these features, it is broadly used in various real life applications especially for acceptance sampling in quality control." Choose the correct option to complete blank in the paragraph given above.

A) Binomial B) Poisson C) Hypergeometric D) Standard E) Variance

Soru 16:

For an observation that results in values 6,7,2,4,3,5,6 what is the %30 trimmed (truncated) mean of the group?

A) 2 B) 3 C) 4 D) 5 E) 10

Soru 17:

What is mode?

A) The most frequent score in a data set B) The gap between the lowest and the highest score C) The difference between a certain score and the average D) The score optained by dividing the total scores by the number of scores E) Scores which are turned into zvalue

Soru 18:

Data : 20, 12, 16, 12, 10 ; what is the Pearson’s coefficient of skewness of these data ?

A) 0.80 B) -1.75 C) 0.90 D) 1.50 E) -1.20

Soru 19:

A box contains 10 glasses : 4 red and 6 blue. Two glasses are selected randomly, without replacement, from this lot. What is the probability that the first selected glass is blue?

A) 3 / 5 B) 7 / 15 C) 7 / 12 D) 17 / 24 E) 3 / 4

Soru 20:

According to empirical probability, which of the following statements is not true?

A) It uses the relative frequencies to assign the probabilities to the events. B) It is based on experiments. C) To find the probability of a specific event, the experiments are repeated many times. D) It states that all the outcomes have the same chance of happening. E) In empirical probability, the past information becomes very important.