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

Soru 1:

Which level of measurement is not suitable for Median

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

Soru 2:

Which class interval is containing the median?

A) 0 up to 20 B) 20 up to 40 C) 40 up to 60 D) 60 up to 80 E) 80 up to 100

Soru 3:

Which of the followings are not correct related to probability density function?

A) In order to calculate the area under a probability function between two points by utilizing probability density function, f (x). B) The probability density function f (x), defines the physical characteristics of the random variable. C) The probability density function determines the shape of the distribution for the continuous random variable X. D) The area under the probability density function f (x) is always equivalent to 3. E) Probability density function is represented by f (x).

Soru 4:

The above table contains the daily sales data of a market. We want to construct relative frequency distribution table for the data. What is the first class’ relative frequency?

A) 0,32 B) 0,47 C) 0,53 D) 0,60 E) 0,64

Soru 5:

Which statements below are correct? I Exponential distribution is a type of a discrete random variable. II Discrete random variables have only a countable number of distinct values. III A discrete random variable typically comprises of a counting concept. IV Continuous random variables represent entire infinite values in an interval. V Continuous random variables are commonly measured instead of counted.

A) I, II, III, IV B) I, II, III, V C) II, III, IV, V D) I, III, IV, V E) Only I

Soru 6:

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

A) 1.9 B) 1.95 C) 2 D) 2.015 E) 2.0615

Soru 7:

Which of the following is a measure of the midpoint or center of the probability distribution?

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

Soru 8:

The above table contains the daily sales data of a market. We want to construct grouped frequency distribution table for the data. What is the class width of the data?

A) 80 B) 90 C) 100 D) 110 E) 120

Soru 9:

Assume that 20 percent of Statistics course students in Anadolu University take Music course, 10 percent take Swimming course, and 4 percent take both Music and Swimming courses. What percentage of Statistics students neither take Music nor Swimming course?

A) 80 B) 74 C) 70 D) 66 E) 34

Soru 10:

During a sales season, the fifteen salesmen in a computer company sold the following numbers of computers: 7, 11, 5, 12, 17, 6, 13, 9, 8, 4, 23, 12, 7, 6, 11. Which of followings is the range of the number of sold computers?

A) R = 23 - 4 = 19 B) R = 4 - 23 = 19 C) R = 19 - 7 = 23 D) R = 11 - 5 = 19 E) R = 12 - 8 = 23

Soru 11:

A engineer wants to choose the best company to work for. Before choosing the company, he classifies the companies according to their location and salary offered. There are 12 different locations and 10 different salaries. In how many different ways can companies be classified?

A) 22 B) 220 C) 2200 D) 120 E) 1200

Soru 12:

If one wants to model the number of customers entering to a fast food restaurant per hour, which probability distribution should he/she use?

A) Poisson B) Binomial C) Hypergeometric D) Continious E) Bernoulli

Soru 13:

Which one is frequently used to summarize the features of probability distributions for a discrete random variable X?

A) Hypergeometric distribution B) Binomial distribution C) Arithmetic mean and variance D) Probability distribution E) Cumulative distribution

Soru 14:

The probability of an event A is 0.6, the probability of an event B is 0.3. The probability that neither A nor B occurs is 0.25. What is the probability that both A and B occurs?

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

Soru 15:

Which of the followings is the most important and widely used measure of variability in statistics ?

A) Range B) Percentiles C) Standard Deviation D) Interquartile Range E) Variance

Soru 16:

Which one is a widely employed discrete probability distribution in statistics where a set of independent observations constitutes exactly two disjoint outcomes of a trial?

A) Hypergeometric distribution B) Binomial distribution C) Poisson distribution D) Probability distribution E) Cumulative distribution

Soru 17:

The box plot is given above shows the data about the number of hours spent on watching tv a day by students in a school. Which of the following is not correct about the box plot data?

A) The median is two hours. B) The interquartile range is three hours. C) 50% of the people watch three hours of TV a day. D) The shape of the distribution is left-skewed. E) There are outliers in the data.

Soru 18:

Let's assume that three perfect coins are flipped three times, what is the probability that all the results are head?

A) 2/9 B) 3/8 C) 2/4 D) 1/8 E) 1/16

Soru 19:

A manager of a café in a university campus assesses its customers as student, academic staff or visitor. She estimates that of all its customers 50% are students, 30% are academic staff and that 20% are visitors. It is known that purchases are made by 70% of student customers, by 60% of academic staff and by 30% of visitors. If a randomly chosen customer makes a purchase, what is the probability that this customer is a student?

A) 0,74 B) 0,54 C) 0,59 D) 0,95 E) 0,059

Soru 20:

A company works with two supplier firms for the same raw material. The first firm's late delivery probability on a given day is 0.05, whereas for the second firm this probability is 0.07. In addition, both firms' late delivery probability on given day is 0.04. What is the late delivery probability of at least one of the firms to company on given day?

A) 0.05 B) 0.06 C) 0.07 D) 0.08 E) 0.09