Prof. Montero Directions:Solve each of the following problems, using the availab

Question

Prof. Montero Directions:Solve each of the following problems, using the available space for scratch work. Decide which the best of the choices given is and fill in the corresponding circle on the answer sheet (6 points each) 1. Which of the following statistics is defined as the 50th percentile? (A) The mean (B) The median (C) The mode (D) The interquartile range (E) The standard deviation 2. A researcher wanted to estimate the average amount of money spent on extracurricular activities per school in a certain region. The researcher randomly selected 20 public schools and 20 private schools in the region to use for a sample. Which of the following best describes the type of sample that was taken? (A) A census (B) A cluster sample (C) A convenience sample (D) A simple random sample (E) A stratified random sample 3. Students in a large psychology class measured the time, in seconds, it took each of them to perform a certain task. The times were later converted to minutes. If a student had a standardized score of z 1.72 before the conversion, what is the standardized score for the student after the conversion? (A) 0.26 (B) z= 1.03 (c) z= 1.72 (D) 2-1.98 (E) The standardized score for the student after the conversion cannot be determined. s. The prices, n thousands of dollars, of the 35 used cars at a certain car dealership are shown in the table below Price (in Which of the fllowing best describes the shape of the distribution of used car prices at the dealership? (A) Skewed to the left (negatively skewed) (B) Skewed to the right (positively skewed) (C) Bimodal (D) Uniform (E) Approximately normal

Explanation / Answer

Solution:-
1. option (B) The median.

2. option (B) A cluster sample

3. option (c) z = 1.72

4. option (B) skewed to the right (positively skewed)

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