Statıstıcs I

Yanıt Açıklaması: The number of concerts that the students attended is shown by the color green. Amanda has the highest green bar. The correct answer is D.

Yanıt Açıklaması: Medical research is a good context to understand these differences - Statistics in medical research is often called Biostatistics.

Yanıt Açıklaması: In many surveys, closed-ended questions are preferred because close-ended questions lead to obtain higher response rates when responders don’t have to type so much.

Yanıt Açıklaması: (25 x 3 + 35 x 3 + 45 x 2) / 8 = 270 / 8 = 32.5

Yanıt Açıklaması: In order to find the mode of this raw data, first, let’s order the data from smallest to largest as follows 2,3,3,3,4,4,5,6,6,6,7 The number 2 is repeated 1 time, 3 is repeated 3 times, 4 is repeated 2 time, 5 is repeated 1 time, 6 is repeated 3 time, 7 is repeated 1 time. Therefore, for this data set, it can be said that there are two modes and these modes are 3 and 6. The answer is E.

Yanıt Açıklaması: Most frequent value(s) is the mode. Middle number in ordered data by magnitude is the median. Average number of values is the arithmetic mean. The answer is B

Yanıt Açıklaması: quantitative interval

Yanıt Açıklaması: Dot plot is almost the easiest of the graphs. It can be drawn by hand easily while collecting data. Dot plot will be very useful when the number of objects in our study is rather small such as up to 50 observations. Dot plot is generally used to investigate univariate (quantitative) data, but sometimes it is used to compare two variables. Essentially a dot plot is a one-dimensional scatterplot of observed values of a variable. In order to create a dot plot one needs to identify the lowest and the highest value of the data set first, then a horizontal axis is drawn and scaled so that it covers the lowest and highest values.

Yanıt Açıklaması: There are 8 observation in this data set. The sum of all the observation result's values is 6+7+3+4+3+5+6+6 = 40 If we divide this value by the number of observation, which is 8, we will find 40/8 = 5 which is the arithmetic mean of this data set. The answer is C.

Yanıt Açıklaması: Data come in various forms and are measured in different ways. For example, a doctor measures your blood pressure with an instrument, a survey researcher asks you a question and you give a verbal response, you go on holiday to a particular country, you are at a certain age and have a certain income, you have a grade for a completed university course, or this past week you have gone to the supermarket a certain number of times, and bought a certain basket of products, etc. Blood pressure, question response, country, age, income, course grade, number of supermarket visits and purchased products, these are all statistical variables. As also understood from the information given, the correct answer is E.

Yanıt Açıklaması: According to graphic, in 2018, during the second month of the year near 60 thousand vehicles, the fifth and seventh month of the year 100 thousand vehicles, and the tenth month of the year near 40 thousand vehicles are registered.   However, during the first month near 120 thousand vehicles are registered. Thus, first month of the year is the month that the most vehicles are registered.

Yanıt Açıklaması: As a general rule, most data on monetary values and those coming from physical measurements (e.g., l­ira, gold price, centimeters, and kilograms) are ratio-scale variables.

Yanıt Açıklaması: Ratio scales of measurement, in addition to having all properties of the interval scale, have a natural or zero-valued base value that cannot be changed. For example, an individual’s age, weight, height, systolic blood pressure are ratio scale variables because they have natural base value. For example, John and Mary are 20 and 40 years old, respectively. We can say that Mary is two times older than John.

Yanıt Açıklaması: Interpretation of the frequency distribution table can be easier or clearer when we use the percentage of the frequency.

Yanıt Açıklaması: qualitative nominal. pg. 14. Correct answer is D.

Yanıt Açıklaması: In order to be able to prove that aspirin is the cause of the improvement in health, an experiment needs to be conducted where conditions are controlled between those taking aspirin and those not taking it. Such an experiment might be designed as follows, restricted to men, for example, since the effects are suspected to be different for men and women.

Yanıt Açıklaması: address is variable, not data.

Yanıt Açıklaması: The definiton corresponds to random error.

Yanıt Açıklaması: 150 + 95 + 35 + 42 + 110 + 60 = 492 492/6= 82 The correct answer is D.

Yanıt Açıklaması: Rated responses generally include three-point, five-point, and seven-point scales. A rating scale should provide more than two options. The mostly used rating scale is five-point Likert (1932) type scale. Likert type scale can be designed in the following forms. • Strongly Agree - Agree – Undecided / Neutral - Disagree - Strongly Disagree • Always - Often - Sometimes - Seldom - Never • Extremely - Very - Moderately - Slightly - Not at all • Excellent - Above Average - Average - Below Average - Very Poor