Deneme Sınavı Soruları

What is the arithmetic mean of the following discrete probablity distribution?

I.     The number of students in a class.

II.    The time spent on doing an assignment.

III.   The height of the students.

IV.    The number of laptops in a school.

Which of the variables above is an example of a discrete random variable?

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

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

Which probability approach uses the relative frequencies to assign the probabilities to the events?

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 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?

According to classical probability approach, what is the probability of obtaining a number less than 3 if we throw a six-sided fair die?

z score of a standard normally distributed random variable Z for value=a is 0.1700. What is P(Z > a) ?

Which of the following is not true about binomial distribution?

Which one of the following ones is included in a box plot ?

I. The time a person spends on reading a day

II. The amount of water a person drinks a day

III. The weight gain of a person in a month

Which of the variables given above are examples of a continuous random variable?

Which of the following is not true about the scatter plot?

For an observation that results in values 4,2,6,7,3,4,3,5,6,6,3 what is the mode of this group?

Which of the following is not an ordinal variable?

There are four participants in our research and their names are Tom, Jane, Tim and Beth. We assign arbitrarily 1 for Tom, 2 for Jane, 3 for Tim and 4 for Beth. Which word below describes the meaning of number 4 in our research?

Which of the following is not true about the dot plot?

The frequency distribution of the students’ weights was constructed as the following table. Consider the grouped data table, what is the ratio of the students whose weights are above 65?

A researcher wants to investigate the effects of tea on heart diseases. What should the researcher do in order to conclude a causal effect?