Final Sınavı - Statıstıcs I - sinavahazirlan.com

Soru 1:

Which of the following statements is not true regarding "percentiles"?

A) The percentiles generally are demonstrated as P(m), where m is the number taking values between 0 and 100. B) Intuitively, the P(m) percentile of a set of n measurements, arranged in order of magnitude, is the value such m percent of the measurements are less than or equal to that corresponding value. C) Some of the specific percentiles frequently used as variability measures are 25th, 50th, and 75th percentiles. D) Various methods may be used for the calculation of percentiles. E) In order to calculate the percentiles, the sample measurements must be sorted from largest to smallest.

Soru 2:

What do we call, If a data set has two modes?

A) Median B) Bimodal C) TripleModal D) Nominal mode E) Minimum mode

Soru 3:

Study the following discrete probability distribution: According to table what is the probability that the result is equal to 2 or less?

A) 3/8 B) 1/8 C) 2/8 D) 7/8 E) 8/8

Soru 4:

The height of the students in a class as follows; 155, 156, 157, 160, 162, 165, 170, 180. Which of the following is the median of the given data?

A) 160 B) 161 C) 162 D) 163 E) 164

Soru 5:

I. The number of people in a mall. II. The speed of a car. III. The exam points of students in a class. Which of the variables above continuous random variable?

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

Soru 6:

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

A) 55 / 32 B) 65 / 34 C) 75 / 42 D) 85 / 44 E) 95 / 48

Soru 7:

Which of the followings is the differences between the third and the first quartiles?

A) Percentiles B) Range C) Interquartile Range D) Box Plot E) Skewness

Soru 8:

According to empirical probability approach, what is the probability of obtaining a number 6 when you throw a six-sided fair die?

A) 0.172 B) 0.272 C) 0.372 D) 0.472 E) 0.572

Soru 9:

The number of houses sold by each of the 10 estate agents during a particular 6 months period are 1, 4, 7, 6, 2, 10, 10, 3, 8, 9. What is the range of the data?

A) 10 B) 9 C) 5 D) 3 E) 1

Soru 10:

Which of the followings is not true about cumulative distribution function?

A) Cumulative distribution function defined as F(x)=P(X≤x)= ∫x f(t)dt,−∞ B) The cumulative distribution function probability supplies values by utilizing probability density function. C) Cumulative distribution function f(x) of a continuous random variable X fulfils the following property; f(x)≥0 for all x. D) Cumulative distribution function f(x) of a continuous random variable X fulfils the following property; if x1 ≤ x2 then F (x1) ≤ F (x2). E) Cumulative distribution function f(x) of a continuous random variable X fulfils the following property; 0 ≤ F (x) ≤ 1.

Soru 11:

Which of the following is not variable?

A) depth B) darkness C) noise D) sense E) feeling

Soru 12:

Find out the mean score of the following data set: 10,20,40,60,100?

A) 42 B) 43 C) 44 D) 45 E) 46

Soru 13:

Data : 1.000, 1.000, 1.200, 1.200, 1.200, 1.400, 1.400, 1.500, 1.500, 1.500, 1.600, 1.600, 1.800, 1.800, 1.800, 2.000, 2.000, 2.500, 2.500, 2.500. What is the IQR of these data ?

A) 500 B) 600 C) 700 D) 800 E) 900

Soru 14:

What is the mean of f(x) = x for 0 ? x ? 4 equal to?

A) 8 B) 9 C) 10 D) 11 E) 12

Soru 15:

What type of a graphic is used to investigate the relationship between two variables?

A) Dot plot B) Pie chart C) Histogram D) Scatter plot E) Line chart

Soru 16:

During a sales season, the five salesmen in a mobile phone company sold the following numbers of mobile phone: 9, 15, 8, 24, 30. What is the range of the number of sold mobile phones?

A) 22 B) 21 C) 15 D) 9 E) 6

Soru 17:

I. f (x) ? 0 for all x. II. the area under probability density function between points a and b is equal to 1 III. P(a ? X ? b) is equal to 1 Which of the statements should the probability density function satisfy?

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

Soru 18:

Which of the following statements is true according to the box-plot given below?

A) The median is 4 cigarettes. B) The interquartile range is 2 cigarettes. C) The shape of the distribution is right-skewed. D) The values greater than 4 are the outliers. E) 50% of the workers consume less than 4 cigarettes.

Soru 19:

Which of the following can be estimated by using ogive curve?

A) Mode B) Arithmetic mean C) Median D) Geometric mean E) Trimmed mean

Soru 20:

Which one can be defined as a rule that assigns probabilities to the values of random variables?

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