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

Soru 1:

How many different ways can the letters in the word COMMON be arranged?

A) 6 B) 180 C) 360 D) 120 E) 720

Soru 2:

What must be the value of "a" if the table above is the probability distribution of variable X whose mean is 2.8?

A) 0.1 B) 0.2 C) 0.3 D) 0.4 E) 0.5

Soru 3:

If there were two dices thrown at the same time what would their total number of possible outcomes be?

A) 6 B) 12 C) 24 D) 36 E) 48

Soru 4:

Consider the probability density function f(x)=0.04, for 15 ? x ? 40 and determine the probability of P (25 <= X < 35) ?

A) 0.1 B) 0.2 C) 0.4 D) 0.5 E) 0.8

Soru 5:

Assume that waiting time to connect to internet at your home is normally distributed with a mean of 270 seconds and a standard deviation of 90 seconds. Find the probability that you can connect to internet in less than 210 seconds in terms of standard normal distribution?

A) 0.5 – P(z = 1/3) B) 0.5 – P(z = 2/3) C) 0.5 + P(z = 1/3) D) 0.5 + P(z = 2/3) E) 1 – P(z = 1/3)

Soru 6:

2 models will be selected to walk in a fashion show in France. There are 2 models from an Italian agency and 3 of them work for a Turkish agency. how many different possible outcomes are there?

A) 4 B) 5 C) 6 D) 7 E) 10

Soru 7:

Students in a course get a grade, either "AA", "BA", "BB", or "BC", etc. What type of variable is the grade?

A) A continuous interval-scale variable B) A textual variable C) An ordinal categorical variable D) A continuous ratio-scale variable E) A nominal categorical variable

Soru 8:

Which of the following is a discrete random variable?

A) A time that is spent to complete a task B) The weight of a newborn baby C) The height of randomly selected students in a classroom D) The number of arrivals at an emergency room between midnight and 6:00 a.m. E) The duration of the next outgoing telephone call from a business office.

Soru 9:

What must be the value of k if the table above is a probability distribution table of variable X?

A) 0.02 B) 0.03 C) 0.05 D) 0.06 E) 0.10

Soru 10:

I. The exponential random variable is frequently used to model the time interval between two events. II. The exponential random variable is defined with a parameter ?. III. The exponential random variable X defines the time interval between two independent events. Which one of the given statements can be said to be true about exponential distribution?

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

Soru 11:

At a local district, there are three different pizza restaurants denoted here by A, B, and C. It is known that 40% of all customers give an order from company A, whereas 35% give an order from company B, and 25% give an order from company C. It is also known that 10% of the motorcycles from company A, 20% of the motorcycles from company B, and 5% of the motorcycles from company C need to a checkup before the next pizza delivery. If a motorcycle returned to the company needs a checkup before the next pizza delivery, what is the probability that this motorcycle was owned by company A?

A) 0,33 B) 0,40 C) 0,52 D) 0,60 E) 0,74

Soru 12:

What is mean score?

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 obtained by dividing the total scores by the number of scores E) Scores which are turned into zvalue

Soru 13:

How many different ordered arrangements of the four letters W,X, Y and Z are there?

A) 12 B) 4 C) 48 D) 24 E) 6

Soru 14:

A support centre receives 8 calls per hour and the number of the calls follows the Poisson distribution. Which of the following is the probability exactly 6 calls in an hour?

A) 0,01 B) 0,02 C) 0,03 D) 0,04 E) 0,05

Soru 15:

The data set: [20,20,20,25,25,30,35,35,40,40,45,45] What is the interquartile range of the data set above?

A) 5 B) 10 C) 15 D) 20 E) 25

Soru 16:

An eye doctor’s physical examination time is exponentially distributed with a mean of 25 minutes Which of the following is the probability that the physical exam duration takes less than 20 minutes?

A) 0,33 B) 0,44 C) 0,55 D) 0,66 E) 0,77

Soru 17:

Consider that continuous random variable X is uniformly distributed and takes values between a and 19 and the mean value of μ=12. Which of the following the standard deviation for the random variable X?

A) 4.001 B) 4.041 C) 4.104 D) 4.101 E) 4.404

Soru 18:

Which of the following is not true about binomial distribution?

A) Independent observations constitute exactly two disjoint outcomes of a trial B) An outcome of a random experiment can be classified into two different categories C) A random experiment (trial) with only two possible outcomes is called a Bernoulli trial. D) Binomial random variable represented as X ~ Binomal (n, p) E) Binominal distribution is used to model the number of outcomes occurring during a specified time interval or in a definite region

Soru 19:

A farming company collected data about the amount of wheat (tons) sold in the last week. The data is as follows, 12, 35, 14, 25, 24, 40, 25. What is the mean of this data set?

A) 25 B) 30 C) 35 D) 40 E) 45

Soru 20:

Which of the followings is a kind of descriptive statistics and give information about the shape of distribution of the observations?

A) Quartiles B) Variance C) Standard Deviation D) Skewness E) Box Plot