DESIGN AND DATA ANALYSIS IN PSYCHOLOGY I Calculate the semiinterquartile amplitude. Partial 1 April, 2017 Calculate Pearson variation coefficient. Interpret bias. Name: _______________________________________________ Interpret kurtosis. Number of identification: _______________________________ Exercise 2. Scores on a neuroticism questionnaire follow a normal Exercise 1. We obtained the following results: distribution with mean 50 and standard deviation 15. Calculate the 33 percentile of the distribution. Mean 10.0000 Median 10.0000 Exercise 3. A researcher selects 50 children randomly and asks Mode 10.00 them to retell the content of a movie that had previously viewed. She counts the number of times each child uses "and then..." in the Std. Deviation 4.44934 story, as it is known from another research that children understand Skewness .000 "stories" in terms of sequences of actions. The results are shown in Std. Error of Skewness .309 Table 1. Kurtosis -.784 X Std. Error of Kurtosis .608 fi 10-14 3 Range 16.00 15-19 30 Minimum 2.00 20-24 15 Maximum 18.00 25-29 0 Percentiles 10 4.0000 30-34 1 35-39 0 20 6.0000 40-44 1 25 6.0000 30 8.0000 a. Calculate the average number of times children use "and then". 40 8.0000 b. Calculate de median of the distribution. c. Which value leaves below itself 77% of participants? 50 10.0000 60 12.0000 70 12.0000 Exercise 4. We have a with normal distribution, a mean variable ‘X’ 75 14.0000 of 50 and a variance of 100. 80 14.0000 a. What is the probability of obtaining values between 45 and 60? 90 16.0000 b. Which standardized score leaves below itself 95% of the cases?
DESIGN AND DATA ANALYSIS IN PSYCHOLOGY I Partial 1 April, 2017 Name: _______________________________________________ Number of identification: _______________________________ Exercise 1. We obtained the following results: Mean 10.0000 Median 10.0000 Mode 10.00 Std. Deviation 4.44934 Skewness .000 Std. Error of Skewness .309 Kurtosis -.784 Std. Error of Kurtosis .608 Range 16.00 Minimum 2.00 Maximum 18.00 Percentiles 10 4.0000 20 6.0000 25 6.0000 30 8.0000 40 8.0000 50 10.0000 60 12.0000 70 12.0000 75 14.0000 80 14.0000 90 16.0000 Calculate the semiinterquartile amplitude. Calculate Pearson variation coefficient. Interpret bias. Interpret kurtosis. Exercise 2. Scores on a neuroticism questionnaire follow a normal distribution with mean 50 and standard deviation 15. Calculate the 33 percentile of the distribution. Exercise 3. A researcher selects 50 children randomly and asks them to retell the content of a movie that had previously viewed. She counts the number of times each child uses "and then..." in the story, as it is known from another research that children understand "stories" in terms of sequences of actions. The results are shown in Table 1. X fi 10-14 3 15-19 30 20-24 15 25-29 0 30-34 1 35-39 0 40-44 1 a. Calculate the average number of times children use "and then". b. Calculate de median of the distribution. c. Which value leaves below itself 77% of participants? Exercise 4. We have a variable ‘X’ with normal distribution, a mean of 50 and a variance of 100. a. What is the probability of obtaining values between 45 and 60? b. Which standardized score leaves below itself 95% of the cases?
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