Statıstıcs I (ENG)
Deneme Sınavı Soruları
- 20 soru
- Cevap anahtarı açık: çöz, sonucunu gör
- 1
Which one is frequently used to summarize the features of probability distributions for a discrete random variable X?
- 2
The standard deviation of the students’ performance scores data is 20. What is the variance of the data?
- 3
Probability density function for continuous random variable X is defined as follows;
f (x) = 0.02, for 0 ≤ x ≤ 50.
Which one below is the probability of P (X < 20)?
- 4
The number of the books have been read by the students in a year are given as follows; 10, 11, 11, 12, 14, 17, 18, 19, 20.
What is the range of the number of books have been read by students in this study?
- 5X=x 1 2 3 4 P(X=x) 0,20 0,25 0,30 0,30 Which of the following is the mean (μ) for the probability distribution given above?
- 6
Which of the following is a continuous random variable?
- 7
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?
- 8A manager in a company has two assistant directors. The probability that the older assistant director comes late to work on a given day is 0.07, whereas for the younger assistant director this probability is 0.05. In addition, the probability that both assistant directors come late to work on given day is 0.03. What is the probability that on a given day one or both assistant directors come late to work?
- 9
What is the formula P(A∩B) = P(A⏐B)P(B) called?
- 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 λ.
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?
- 11I. The air pressure on a tire on an automobile II.The number of students who actually register for classes III. The amount of liquid in a can of cola IV. The temperature of a cup of coffee Which of the variables above are examples of a continuous random variable?
- 12
In how many different ways can the letters in U-S-U-A-L-L-Y be arranged?
- 13
Which of the following is generally demonstrated as P(m), where m is the number taking values between 0 and 100?
- 14
Which of the following is not variable?
- 15
Which of the following is more useful to discover the overall shape of the data?
- 16
The chart below shows the relationship between humidity and temperature for 25 days. Which option is correct depending on the information on the chart?
- 17
Self-reported data for high school students is presented in the table above. In which of the following correctly refers to the measurement levels of the variables "career plans and age"?
- 18
The contingency table constructed between the smoking status and age of the participants is as follows.
Within the non-smokers, what is the percentage of participants under 30?
- 19
- Age
- Hours of Sleep
- The Inflation Rate
- Gold Price
- Time to Run 100 meters
Which of the above are interval-scale variables?
- 20
For an observation that results in values 6,7,3,4,3,5,6 what is the 30% Winsorized mean of the group?