Statistics Q1 For the following data set, determine the first quartile. 186 192 188 203 181 190 235 154 219 160 226 240 a. 182.25 b. 175.25 c. 171.25 d. 197.25 Q2 Consider the following 3 sets of data. Which of the following statements is true? Set #1 --- 12, 11, 9, 10, 8 Set #2 --- 11, 8, 100, 9, 10 Set #3 --- 1000, 9, 8, 11, 10 a. The median would be an appropriate statistic due to its resistance to an possible outlier b. As the data become more skewed, the median gets higher and higher c. The median for all the 3 data sets is identical and equal to 10. This implies that the 3 data distributions are symmetrical. d. The most skewed distribution is from data set #3. It is also found that for data set #2, the mean is less than median For the following data set, determine the third quartile. 186 192 188 203 181 190 235 154 219 160 226 240 a. 203.25 b. 257.25 c. 245.25 d. 224.25 Q3 "Based on a survey of people attending a movie yesterday, 73% of those who watched the movie gave it a 4 star rating." a. Hypothesis testing b. Inferential statistics c. Descriptive statistics d. Parameter Q4 The number of counts of complaints for a particular brand of hand phone per month is an example of ________ data. a Continuous Q5 . b Discrete . c Systematic . d Random . Which of the following is NOT the goal of descriptive statistics? a Summarising data . b Estimating the variance of the population . c Displaying essential features of the collected data . d Reporting numerical results . Q6 Q7 The \"Pearson correlation coefficient (r)\" is a quantitative measure of the correlation between two variables. Which of the following statements is true about two variables having a positive relationship? a. The value of r is negative b. The value of r is close to zero c. The value of r is positive d. The value of r is between -1 and +1 Q8 Consider the following data set: 2880, 2920, 3325, 2940, 3130, 2890, 2710, 2755, 2880, 3050, 2950, 2850. Find the 80th percentile. a 3082 . b 2950 . c 2650 . d 2880 . Q9 Q10 Which of the following cannot be used as a measure of variation of a set of data? a. Skewness b. Standard deviation c. Interquartile range d. Range Which of the following statements is FALSE? a. In a symmetrical distribution, the "mean", "median" and "mode are identical. b. A sample is a subset of data selected from the target population. A population is a data set (usually large, somtimes conceptual) that is our target of interest. c. A parameter is a numerical descriptive measure computed from sample data. A statistic is a numerical descriptive measure of a population d. Q11 A statistics is a numerical descriptive measure computed from sample data. A parameter is a numerical descriptive measure of a population. the column "5% waited longer than this to see doctor"?represents the ______ statistics. a. 50th percentile b. 95th percentile? c. average d. 5th percentile For the following data set, the skewness is found to be 0.06. Comment on the distribution of this data set. 186 192 188 203 181 190 235 154 219 160 226 240 a. The distribution is skewed to the right b. The distribution is very close to symmetrical in shape. c. The distribution is skewed to the left d. The distribution is non-symmetrical and neither skewed to the left or right Q12 Q13 Which of the following cannot be used as a measure of variation of a set of data? a. Skewness b. Standard deviation c. Interquartile range d. Range Q Statistics Q1 For the following data set, determine the first quartile. 186 192 188 203 181 190 235 154 219 160 226 240 a. 182.25 b. 175.25 c. 171.25 d. 197.25 We rearrange the data in ascending order 154, 160, 181, 186, 188, 190, 192, 203, 219, 226, 235, 240 We get the median =(190+192)/2=191 Since 190 is less than the median it falls to the left half Q1= (181+186)/2=183.5 Q2 Consider the following 3 sets of data. Which of the following statements is true? Set #1 --- 12, 11, 9, 10, 8 Set #2 --- 11, 8, 100, 9, 10 Set #3 --- 1000, 9, 8, 11, 10 a. The median would be an appropriate statistic due to its resistance to an possible outlier b. As the data become more skewed, the median gets higher and higher c. The median for all the 3 data sets is identical and equal to 10. This implies that the 3 data distributions are symmetrical. d. The most skewed distribution is from data set #3. It is also found that for data set #2, the mean is less than median For the following data set, determine the third quartile. 186 192 188 203 181 190 235 154 219 160 226 240 a. 203.25 Q3 b. 257.25 c. 245.25 d. 224.25 We rearrange the data in ascending order 154, 160, 181, 186, 188, 190, 192, 203, 219, 226, 235, 240 We get the median =(190+192)/2=191 Q3= (226+219)/2=222.5 "Based on a survey of people attending a movie yesterday, 73% of those who watched the movie gave it a 4 star rating." Q4 a. Hypothesis testing b. Inferential statistics c. Descriptive statistics d. Parameter Inferential statistics tries to reach a conclusion that extends beyond the immediate data, for instance trying to infer from a sample what a population thinks. Q5 The number of counts of complaints for a particular brand of hand phone per month is an example of ________ data. a Continuous . b Discrete . c Systematic . d Random . Q6 a . b . c . d . Which of the following is NOT the goal of descriptive statistics? Summarising data Estimating the variance of the population Displaying essential features of the collected data Reporting numerical results Q7 The \"Pearson correlation coefficient (r)\" is a quantitative measure of the correlation between two variables. Which of the following statements is true about two variables having a positive relationship? a. The value of r is negative b. The value of r is close to zero c. The value of r is positive d. The value of r is between -1 and +1 Q8 Consider the following data set: 2880, 2920, 3325, 2940, 3130, 2890, 2710, 2755, 2880, 3050, 2950, 2850. Find the 80th percentile. a 3082 . b 2950 . c 2650 . d 2880 . Rearrange in increasing order 2710 2755 2880 2880 2850 2890 2920 2940 2950 3050 3130 3325 Multiply k percentile by the number of values of n, called the index 80%*12=9.6 Take the value to the right =9 Count the values in your data set from left to right until you reach the number indicated in step above. 9th place hold 2950 which is our 80% percentile. Q9 Which of the following cannot be used as a measure of variation of a set of data? a. Skewness b. Standard deviation c. Interquartile range d. Range Q10 Which of the following statements is FALSE? a. In a symmetrical distribution, the "mean", "median" and "mode are identical. b. A sample is a subset of data selected from the target population. A population is a data set (usually large, somtimes conceptual) that is our target of interest. c. A parameter is a numerical descriptive measure computed from sample data. A statistic is a numerical descriptive measure of a population d. Q11 A statistics is a numerical descriptive measure computed from sample data. A parameter is a numerical descriptive measure of a population. the column "5% waited longer than this to see doctor"?represents the ______ statistics. a. 50th percentile b. 95th percentile? c. average d. 5th percentile For the following data set, the skewness is found to be 0.06. Comment on the distribution of this data set. 186 192 188 203 181 190 235 154 219 160 226 240 a. The distribution is skewed to the right Q12 b. The distribution is very close to symmetrical in shape. c. The distribution is skewed to the left d. The distribution is non-symmetrical and neither skewed to the left or right Q13 Which of the following cannot be used as a measure of variation of a set of data? a. Skewness b. Standard deviation c. Interquartile range d. Range