Introduction to Statistics Final Exam Questions and Correct Answers & Latest Updated

One year a survey asked a group of people from a certain country the following question, "How many foreign languages do you know?" Of the 857 people who responded, 66% reported knowing only 1 foreign language. Identify the sample. o :## The sample is the 857 people who responded A poll of about 1200 people between the ages of 50 and 64 asked "How concerned are you about the problem of natural disasters?" The possible responses were very concerned, somewhat concerned, not very concerned, and haven't heard about it. The poll reported percentages (44, 30, 22, 4) in these categories. Are the percentages statistics or parameters? o :## The percentages quoted are statistics because they are a numerical summary of a sample taken from a population Categorical or Quantitative? Beverage preference o :## Categorical Categorical or Quantitative? Size of home 2 | P a g e : 2 0 2 4 / 2 0 2 5 G r a d e A + Master01: DO NOT COPY AND PASTE!! August 25, 2024 Latest Update o :## Qualitative Continuous or discrete? Height of a tree o :## continuous Continuous or discrete? Number of socks in a drawer o :## discrete According to a study, the median household income for a group was $50,043 while the mean was $73,409. Does this suggest that the distribution of household income for the group is symmetric, skewed tot he right, or skewed to the left? o :## the fact that the mean is larger than the median for the group indicates that there are extremely large incomes that are affecting the mean, suggesting the shape is skewed to the right. For the following pair of variables, which more naturally is the response variable and which is the explanatory variable? Grade received and Effort o :## Grade received is the response variable because it is the outcome variable on which comparisons are made and Effort is the explanatory variable. 3 | P a g e : 2 0 2 4 / 2 0 2 5 G r a d e A + Master01: DO NOT COPY AND PASTE!! August 25, 2024 Latest Update For the 75 cars on the lot unused-car dealership, consider the age of the car and the resale value. What would one expect to be the association between the variables? o :## Negative association because the resale value decreases as the age of the car increases. A study compared colleges that used metal detectors with colleges that did not, finding similar levels of students carrying concealed weapons in each. State a potential lurking variable that could affect the result of such a study. o :## The colleges that used metal detectors may have formerly had higher rates of students carrying concealed weapons. A political scientist studied the effect of the race of the interviewer. Following a phone interview, respondents were asked whether they thought the interviewer was black or white all were actually black). Perceiving a white i