Saturday, June 25, 2016

QUIZ Exploring Data 11 Questions Solution

Here is the solution for the Quiz of a online course Basic Statistics offered by the Coursera website. This quiz is first week quiz and solution is given below get 100% result all are right answers.

Exploring Data

11 questions

Q #1 A researcher wants to measure physical height in as much detail as possible. Which level of measurement does s/he employ?
Answer                  Ratio level
Q #2 You conduct a study on eye color and you question 550 people. 110 of them have brown eyes and 44% of them have blue eyes. What percentage of the people you questioned has blue or brown eyes? [Your answer should consist of just the number, no additional characters - so if you think the answer is 41% enter the number 41]
Answer                   64
Q #3 In which situation is a bar graph preferred over a pie chart?
Answer                  When the number of categories in the data is high.
Q #4 Ten students completed an exam. Their scores were: 5, 7, 2, 1, 3, 4, 8, 8, 6, 6. What is the interquartile range (IQR)?
Answer                   4
Q#5 A researcher wants to know what people in Amsterdam think of football. He asks ten people to rate their attitude towards football on a scale from 0 (don't like football at all) to 10 (like football a lot). The ratings are as follows: 1, 10, 6, 9, 2, 5, 6, 6, 5, 10. What is the standard deviation?
Answer                  3,1
Q#6 You find a z-score of -1.99. Which statement(s) is/are true?
  • Answer       The score falls below the mean score.
  • The score lies almost two standard deviations from the mean.
Q#7 Which of the following statements is true?
  • Answer       Both statements are false.
Q#8 The grades for a statistics exam are as follows: 3, 5, 5, 6, 7.5, 6, 5, 1, 10, 4. Which score is an outlier? (Use the interquartile range (IQR).)
Answer                  10
Q#9 How many goals have the top strikers of the Dutch Eredivisie football competition scored? We look at 10 strikers and obtained the following information: 12, 10, 11, 12, 11, 14, 15, 18, 21, 11. The (1) ... of the dataset equals 12, the mean equals (2) ... and the (3) ... equals 11. The standard deviation equals (4) ... Fill in the right words/numbers on the dots.
Answer      (1) Median, (2) 13.5, (3) Mode, (4) 3.57
Q#10 What is true about a variance of zero? (Multiple answers possible.)
  • There is no variability in the scores: everybody has the same score.
  • The standard deviation equals zero as well.
Q#11 What is the difference between variables and constants?

  • Variables vary across cases, constants do not vary.

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