Question 1. Please fill the right answers in the Table below. 1. The estimation of average consumer expenditure on milk based on the sample of 100,000 families is an example of a) inferential statistics. descriptive statistics. a parameter. a statistic. 2. The classification of cell-phones brand (Apple, Redmi, and Samsung) is an example of a) a categorical (qualitative) variable. b) a discrete variable. c) a continuous variable. d) a parameter. 3. The possible responses to the question "How many hours do you work a day?" are values from a a) discrete numerical random variable. b) continuous numerical random variable. c) categorical random variable. d) parameter. 5- Data on 1,500 students' favorite football team were collected at Al-Quds University. Which of the following is the best graph for presenting the information? a) A polygon. b) An Ogive. c) A bar chart. d) A histogram. 6- When extreme values (outliers) are present in a set of data, which of the following central tendency measure is appropriate: a) Range. b) trimmed mean. c) median d) B and C. 7- The larger the dispersion of data around the mean, a. the smaller the range. b. the larger the mean. c. The smaller is the interquartile range d. The larger the variance.Question 2 The data below represent the sales in thousands of dollars for a sample of 12 different companies. 10 17 23 29 19 22 21 33 33 15 25 1700 Assuming that the sales' population distribution of all companies is normally distributed. 1. What is the point estimate of the mean sales for all companies. 2. Construct a 95% confidence interval of the mean sales for all companies. 3. Briefly explain how would decrease the margin of error of the estimate you find in part 2). 48- When extreme values (outliers) are present in a set of data, which of the following dispersion measure is appropriate: a) Interquartile Range. b) Variance. c) Standard deviation. d) None of the above. 9- Assume the standard deviation of wages in Hebron is 25 Shekel and standard deviation of wages in Ramallah is 40 Shekel. Then it can be concluded that: a) Dispersion in wages is higher in Hebron. b) Dispersion in wages is higher in Ramallah. c) Dispersion in wages in Hebron is the same as in Ramallah. d) None of the above. 10- If the data do not contain outliers, then the best measure of central tendency is: a) Mean b) Median. c) Mode. d) A and B. 1 1- We use the mean to: a) Summarize Qualitative data. b) Summarize Quantitative data. c) Summarize Quantitative and qualitative data. None of the above. 12- We use relative frequency Table to: e) Summarize Qualitative data. f) Summarize Quantitative data. g) Summarize Quantitative and qualitative data. h) None of the above. 13- The sample size depends on a number of factors including: a) Size of population. b) Margin of error. c) Confidence level. d) All of the above. 14- The sample size: a) Must increase if the margin of error is small. b) Must decrease if confidence level is high. c) a) and b). d) none of the above. 15- To select a random sample of Palestinian households, researchers need to pick its element from a Sampling Frame of all Palestinian Household. a) True. b) False.Question 3: We manager of a bank claims that the mean balance of all checking accounts at his bank was $850 last month. A random sample of 32 checking accounts was taken from this bank gave a mean balance of $780 with standard deviation of $230. Using 1% significance level, can you conclude that the mean balance of all checking accounts is different from $850? Question 4 Assume you work as an economic consultant for the Miniter of Labour. It is claimed that the current unemployment rate in the West Bank is 20%. Briefly explain, in a few steps, how would you test for this claim