İST209U
İSTATİSTİK I
5. Ünite
Soru 1
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?
Soru 2
A farming company collected data about the amount of wheat (tons) sold in the last week. The data is as follows, 12, 35, 14, 25, 24, 40, 25. What is the mean of this data set?
Soru 3
A farming company collected data about the amount of wheat (tons) sold in the last week. The data is as follows, 12, 35, 14, 25, 24, 40, 25. What is the standard deviation of the data set?
Soru 4
The frequency distribution table of the students’ performance scores of a school were constructed as follows. What is the sample mean of the data?
Soru 5
The frequency distribution table of the students’ performance scores of a school were constructed as follows. What is the sample standard deviation of the data?
Soru 6
The standard deviation of the students’ performance scores data is 20. What is the variance of the data?
Soru 7
A bakery employs 10 people. The number of years’ experience that the employees of the company have is the following: 0, 0, 2, 4, 5, 8, 15, 17, 20, 24. What is the 50th percentile of the data?
Soru 8
Which class interval is containing the median?
Soru 9
A bakery employs 10 people. The number of years’ experience that the employees of the company have is the following: 0, 0, 2, 4, 5, 8, 15, 17, 20, 24. What is the 80th percentile of the data?
Soru 10
A bakery employs 10 people. The number of years’ experience that the employees of the company have is the following: 0, 0, 2, 4, 5, 8, 15, 17, 20, 24. What is the interquartile range of the data?
Soru 11
Which of the followings is not true regarding "range"?
Soru 12
Which of the followings is the most important and widely used measure of variability in statistics ?
Soru 13
Which of the followings is generally demonstrated as P(m), where m is the number taking values between 0 and 100?
Soru 14
Which of the following statements is not true regarding "percentiles"?
Soru 15
Which of the followings is the differences between the third and the first quartiles?
Soru 16
Which of the following information cannot be obtained from a box plot?
Soru 17
Which of the followings is a kind of descriptive statistics and give information about the shape of distribution of the observations?
Soru 18
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?
Soru 19
The sample standard deviation and the sample variance for a frequency distribution can be calculated as follows.
s= ∑k fi(xi−X)2 i=1 n−1
s=∑k fi(xi−X)2 2 i=1 n−1
Which of the followings is not true related to this formula?
Soru 20
A petrol company collected the data about the amount of fuel (tons) sold on two cities in a given Saturday. In each city the company has ten gas stations. The data is as follows.
City A: 3, 5, 6, 2, 7, 9, 8, 1, 4, 8
City B: 1, 4, 6, 2, 7, 19, 8, 1, 2, 18
Which of the followings is the sample mean of the city A?