Final Sınavı - Statıstıcs I - sinavahazirlan.com

Soru 1:

Which of the following is used to investigate the relationship between two variables?

A) Scatter plot B) Lina chart C) Bar chart D) Histogram E) Pie chart

Soru 2:

According to classical probability, when rolling a fair dice, what is the probability of obtaining the number 5?

A) 5/6 B) 4/6 C) 3/6 D) 2/6 E) 1/6

Soru 3:

Which is NOT TRUE about a random experiment ?

A) It is any process that leads to two or more possible outcomes B) We are able to know which outcome will occur C) We are able to list or describe all of the possible outcomes D) The set of all possible outcomes is important to understand E) Its set of all possible outcomes is called thesample space

Soru 4:

For X which is a continuous random variable that is uniformly distributed and takes values between 3 and 9. What is the mean of the random variable X ?

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

Soru 5:

What type of variable are your exam grades?

A) interval-scale variable B) nominal categorical variable C) ordinal categorical variable D) ratio-scale variable E) continous interval variable

Soru 6:

Consider the probability density function f(x)=0.025, for 20 ? x ? 60 and find the standard deviation of this function?

A) 101/3 B) 12.5 C) 15 D) 151/2 E) 20 / 31/2

Soru 7:

Which option gives the correct terms to complete the blanks given in the graph in the correct order ( from 1 to 4)?

A) Left skewed- mode - median - mean B) Left skewed - mean - median - mode C) Right skewed - mode- median- mean D) Left skewed - median - mean - mode E) Right skewed - median - mean - mode

Soru 8:

In how many different ways can the letters in U-S-U-A-L-L-Y be arranged?

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

Soru 9:

Pdf for continuous random variable X is defined as follows; f (x) = 0.02, for 0 ? x ? 50. What is the mean of the continuous random variable X ?

A) 25 B) 0.25 C) 2.5 D) 30 E) 3.

Soru 10:

There are 6 red and 4 blue balls in a box. One randomly chooses 4 balls from the box without replacing it. What is the probability of choosing at most 1 red ball out of these 4 balls?

A) 0.12 B) 0.18 C) 0.24 D) 0.36 E) 0.48

Soru 11:

What is range?

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 12:

Which of the following is used to represent discrete values for each category for a given variable on horizontal axis while vertical axis show the actual numbers of each category?

A) stem-and-leaf B) Simple bar chart C) Stacked bar chart D) Grouped bar chart E) Pie chart

Soru 13:

What does a variable's taking on infinite number of possible outcomes in a given interval show?

A) that it is a continuous random variable B) that it is a discrete random variable C) that it typically comprises of a counting concept D) that it cannot be determined from the area under probability density function E) that it cannot keep uncountable measures

Soru 14:

Which scales of measurement have a natural or zero-valued base value that cannot be changed?

A) Ratio scale B) Interval scale C) Ordinal scale D) Nominal scale E) Qualitative scale

Soru 15:

An investor needs to decide on that the power of Turkish Lira to make an investment in Turkey and wants to analyze the tendency of Turkish Lira versus a foreign currency. Which type of display is best for the investor?

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

Soru 16:

I. The complement of an event A is the set of all basic outcomes in S that do not belong to A. II. The union of events A and B is the set of all elementary outcomes that belong to both sets. III. The intersection of events A and B is the set of all elementary outcomes that belong to at least one of the sets A and B. For A and B, which are any two events in a random experiment with sample space S, which of the statements are true?

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

Soru 17:

There are 36 cards in a box with three different colors-6 yellow, 12 blue, 18 red. What is the probability of obtaining two yellow cards when randomly drawing two cards?

A) 1/42= 0.02381 B) 5/216 = 0.02315 C) 1/35 = 0.02857 D) 4/35 = 0.11429 E) 9/35 = 0.25714

Soru 18:

Which one below is NOT an example of a continuous random variable?

A) The speed of a plane B) The number of students who are present in the class C) Rainfall amount in a given day D) Travel duration from Ankara to Eskisehir on Sundays E) Waiting time at the university cafeteria lane during the lunch hour

Soru 19:

Data : 100, 120, 120, 180, 200. What is the sample standard deviation of these data ?

A) 5.5251/2/ 3 B) 6.6251/2/ 3 C) 8.2751/2/ 3 D) 7.4751/2/ 2 E) 9.2501/2/ 2

Soru 20:

Data : 0.2, 0.5, 0.17, 0.22, 0.26, 0.34, 0.39, 0.44, 0.55, 0.87, 1.1, 1.14, 2.5, 2.9, 4.4, 5.6. What is the 80th percentile of these data ?

A) 2.5 B) 2.9 C) 4.4 D) 3.45 E) 1.14