Aof Panel

Soru 1

Which of the above statements related to the data is correct?

Soru 2

Which of the above are correct?

Çözüm Açıklaması

The easiest form of data is called categorical, or qualitative, for example data on variables “country” (e.g., the data observation might be Germany) or “question response” (e.g., believe that climate change is manmade) or “exam grade” (e.g., B). Categorical variables and data can be either nominal or ordinal. The question about climate change, with possible responses “natural”, “manmade” or “don’t know/can’t answer” is a nominal categorical variable, as is the variable “country” - there is no ordering in the categories of these variables. By contrast, exam grade is an ordinal categorical variable, since its categories are ordered: A is better than a B, B is better than a C, and so on.

Other examples of nominal categorical variables are gender, region of residence, field of study, type of transport, type of housing, etc.

Other examples of ordinal categorical variables are income group (if incomes have been categorized), an attitude question in a survey where possible responses are strongly agree/agree/disagree/strongly disagree (these categories have an order), social class (with classes usually in an inherent order), terrorist threat levels (in the UK these are low/moderate/substantial/severe/critical), etc.

The other main type of data (see Fig. 1.4) is called continuous, or quantitative, for example data on variables “blood pressure”, “age” and “income”. These are observations of variables on continuous scales, usually rounded in some convenient way. For example, although age is a continuous time variable, and we are getting older all the time by seconds, minutes and hours, someone’s age is almost always rounded to the number of years completed. There is a subtle difference between interval-scale and ratio-scale continuous data, which is worth mentioning here. Age is an interval-scale variable: to compare two children of ages 10 and 12, we would compute the interval difference, i.e. 2 years. We would not say the 12-year old is 20% older than the 10-year old. But comparing prices or incomes, for example, we would tend to compute percentage differences, making them ratio-scale variables. A good example is the inflation rate, comparing the prices of a basket of products over time, not as a difference but as a percentage. As a general rule, most data on monetary values and those coming from physical measurements (e.g., lira, gold price, centimeters, kilograms) are ratio-scale variables.

As also understood from the information given, the correct answer is I, II, III and IV.

Soru 3

Which of the following is not big data?

Soru 4

Your body temperature changes through exercises.
What type of variable is it?

Soru 5

Which one below gives us the difference between Dot plot and Stem-and-Leaf Display?

Soru 6

“It gives the researcher a chance to create a grouped frequency distribution of the data without using any formula”

Which of the data presentation visual is mentioned in this sentence?

Soru 7

Which of the following is not true for dot plots?

Soru 8

Which of the following is preferably used to visualize a trend of continuous data over time?

Soru 9

Which one of the following is an example of central tendency measures?

Soru 10

In a data set, what is the difference between the largest and smallest values called?

Soru 11

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. What is the range of the number of sold computers?

Soru 12

The measures of ________ are another kind of descriptive statistics and give information about the shape of distribution of the observations.

Which option completes the blank in the description above?

Soru 13

I. The mean is pulled in the direction of the tail.

II. The median falls between the mode and the mean.

III. The mean, median, and mode are all the same.

If the distribution is left skewed, having a long tail in negative direction and a single peak, which of the statements above are true?

Soru 14

I. The central tendency measure of the distribution

II. A measure of the variability of the observations

III. The information of the distribution shape

Which pieces of information given above can be obtained from a box-plot?

Soru 15

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

Soru 16

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

Soru 17

Which of the following is the most important and widely used measure of variability in statistics?

Soru 18

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?

Soru 19

During a festival, the five bar tenders in the festival area sold the following number of beers in three days : 9540, 3600, 5566, 12345 and 8745. What is the range of the beers sold during the festival?

Soru 20

Which of the following is not true about range?

İSTATİSTİK I - Deneme Sınavı - 11