Stats Practice Exam
Sample Final MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Questions 1-4 The following is a set of data from a sample of size n( n=6): 1) Find the mean of the data set A) 15 B) 14 C) 10 D) 13.5 10, 17, -2, 10, 23, 26.
2) Find the standard deviation of the data set A) 9.33 B) 522.00 C) 104.40 D) 10.22
3) The five-number summary of the data set consists of __________, __________, __________, __________, and __________. A) -2, 10, 13.5, 23, 26 B) -2, 10, 14.5, 23, 26 C) -2, 1.5, 3, 4.5, 26 D) -2, 10, 14, 23, 26
4) Based on the boxplot, the distribution shape of the data set is A) normal B) bell-shape C) left-skewed D) right-skewed
Question 5-7: The owner of a local nightclub has recently surveyed a random sampled of 81 customers of the club with: X = 21.73, s = 2.8. She would like to determine whether or not the mean age of her customers is over 21. 5) Give the null and alternative hypotheses. A) H0: X ≤ 21.73 and H1: X > 21.73 C) H0: m ≤ 21 and H1: m > 21 B) H0: m = 21 and H1: m ≠ 21 D) H0: m ≥ 21 and H1: m < 21
6) Using the sample information provided, calculate the value of the test statistic. A) t = (21.73-21.00) / (2.8/9) C) t = (21.73-21.00) / 2.8 7) Suppose a = 0.005. Which of the following is correct? A) At a = 0.005, we fail to reject H0. C) No decision should be make B) At a = 0.005, we accept the data. D) At a = 0.005, we reject H0. B) t = (21.73-21.00 ) / ( 2.8/92 ) D) t = (21.00 - 21.73) / ( 2.8/9)
Question 8-9: The following table contains the number of employees of a company over the last five year. Year Number of employees 1999 35 2000 40 2001 45 2002 40 2003 38 8) If a three-term moving average is used for forcasting, what is the forscasting for year 2003? A) 38 B) 40 C) 41.67 D) 41
9) If we want to obtain the exponential smoothing time-series for forcasting, what would be the valus of F4 (use a=0.4)? A) 40.2 B) 45 C) 37 D) 41.8
10) Based on the definition, a wavelike
2) Find the standard deviation of the data set A) 9.33 B) 522.00 C) 104.40 D) 10.22
3) The five-number summary of the data set consists of __________, __________, __________, __________, and __________. A) -2, 10, 13.5, 23, 26 B) -2, 10, 14.5, 23, 26 C) -2, 1.5, 3, 4.5, 26 D) -2, 10, 14, 23, 26
4) Based on the boxplot, the distribution shape of the data set is A) normal B) bell-shape C) left-skewed D) right-skewed
Question 5-7: The owner of a local nightclub has recently surveyed a random sampled of 81 customers of the club with: X = 21.73, s = 2.8. She would like to determine whether or not the mean age of her customers is over 21. 5) Give the null and alternative hypotheses. A) H0: X ≤ 21.73 and H1: X > 21.73 C) H0: m ≤ 21 and H1: m > 21 B) H0: m = 21 and H1: m ≠ 21 D) H0: m ≥ 21 and H1: m < 21
6) Using the sample information provided, calculate the value of the test statistic. A) t = (21.73-21.00) / (2.8/9) C) t = (21.73-21.00) / 2.8 7) Suppose a = 0.005. Which of the following is correct? A) At a = 0.005, we fail to reject H0. C) No decision should be make B) At a = 0.005, we accept the data. D) At a = 0.005, we reject H0. B) t = (21.73-21.00 ) / ( 2.8/92 ) D) t = (21.00 - 21.73) / ( 2.8/9)
Question 8-9: The following table contains the number of employees of a company over the last five year. Year Number of employees 1999 35 2000 40 2001 45 2002 40 2003 38 8) If a three-term moving average is used for forcasting, what is the forscasting for year 2003? A) 38 B) 40 C) 41.67 D) 41
9) If we want to obtain the exponential smoothing time-series for forcasting, what would be the valus of F4 (use a=0.4)? A) 40.2 B) 45 C) 37 D) 41.8
10) Based on the definition, a wavelike