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Statistics | Questions and Answers

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Added on  2022-07-28

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1)Use the dataset-black chp2 to calculate the following: range, inter quartile range (IQR), mean absolute deviation (MAD), Mean, Mode, Median, Variance, Coefficient of Variation and Coefficient of Skewness. 2) Interpret the difference between the Mode, Median and Mean, as well as the Coefficient of Skewness: what do it's value say? 3) If 3 out of 10 Wittenborg students is a female, what is the probability of finding 14 females in a class of 20 students? 4) Calculate or determine the following probabilities, given that the average IQ is 100, and the standard deviation is 15: - p (someones IQ is the population average or less) - p (someones IQ is less than 115) - p (someones IQ is less than 85 or bigger than 115) - p( someone IQ is bigger than 124 -or fill in your own IQ if known) 4) List three examples of sampling and three of non-sampling errors in research. Discuss how to change them into correct actions for investigation. 5) Take the dataset wage-example, taken from ch 10

Statistics | Questions and Answers

   Added on 2022-07-28

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STATISTICS
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Statistics | Questions and Answers_1
Question 1
Numerical summary of the given dataset
Question 2
The mean value is 40.43 while the median is 37 and mode is 30. The difference in these
measures of central tendency implies that the given data is not normally distributed. Also,
higher value of mean than median is also on account of some abnormally higher values which
may be present in the dataset. The skew value is 0.85 which indicates that dataset is non-
normal with longer tail on the right (Flick. 2015).
Question 3
Number of female students = 3
Total students = 10
Probability that female student is selected = 3/10 = 0.30
Probability to find 14 females in class of 20 students =?
This is binomial distribution and the requisite probability is computed below.
1
Statistics | Questions and Answers_2
Question 4
Average IQ = 100
Standard deviation = 15
Normal distribution
Probability (X <= 100)
Probability (X <= 115)
2
Statistics | Questions and Answers_3

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