UPDATED MAT 1450 INTRODUCTORY STATISTICS QUESTIONS WITH VERIFIED ANSWERS (GRADED A++)

UPDATED MAT 1450 INTRODUCTORY STATISTICS QUESTIONS WITH VERIFIED ANSWERS (GRADED A++) You want to find the average test score of the students in every math class in 11th grade. There are 15math classes in 11th grade. You survey the scores of 7 math classes, and you calculate that the average test score is 83%. Which of the following represent the sample and the parameter in this scenario? - ANSWER-Sample: 7 math classes Parameter: there is no parameter There are 6000 people who attended a political debate at a convention center. There are three candidates who are participating in the debate - Mr. Smith, Mr. Jones, or Ms. Roberts. You want to find out which candidate is most popular amongst the people attending. You ask 500 people as they walk into the convention center. Which represents the population in this scenario? - ANSWER-the 6000 people attending the debate Convenience Sampling - ANSWER-a type of sampling that is not random and involves using a population that is readily available Quota sampling - ANSWER-using a sample that is selected to match the population with respect to some specific characteristic(s). Cluster sampling - ANSWER-dividing the population into groups, and then randomly selecting some of the groups Systematic sampling - ANSWER-randomly selecting a starting point in a list of names and take every nth piece of data from a listing of the population Stratified Sampling - ANSWER-dividing the population into groups, and then taking your sample from a proportionate number from each group Annie wants to estimate the average number of AP classes a student at her high school takes. She decides to randomly select 6 classes and use all the students in those 6 classes to estimate the average. What type of sampling did Annie use? - ANSWER-cluster sampling Sneha wants to inspect the cleanliness of the rooms in a hotel. There are 10 floors in the hotel and each floor has 20 rooms. From each floor, she randomly selects 2 rooms and inspects them. - ANSWER-stratified Raymond wants to estimate the percentage of parents that use cloth diapers. He asks a randomly selected group of 200 parents whether or not they use cloth diapers. What is the parameter? - ANSWER-the percentage of all parents that use cloth diapers Anna wants to estimate the mean number of siblings for each student in her school. She records the number of siblings for each of 75 randomly selected students in the school. What is the statistic? - ANSWER-the mean number of siblings for the randomly selected students Which of the following represents the population in the scenario below? A researcher wants to know what percentage of people who live in Germany are satisfied with their government. Surveys are sent to people who live in the city limits of Berlin, Frankfurt, and Munich of Germany. - ANSWER-People who live in Germany stem and leaf plot - ANSWER-a graph, especially good for small sets of data, that separates data points into a leaf consisting of the last significant digit and a stem that consists of any numbers to the left of that digit and can be arranged in ascending or descending order dot plot - ANSWER-a graph that helps show the distribution of values in a set of data, consisting of a horizontal axis labeled with data values, dots drawn above the axis to represent single data values, and no vertical axisA Dot plot is sometimes written as Dotplot and in some cases can be referred to as a Dot chart uniform - ANSWER-way to explain the general shape of a distribution with no distinct peaks, so the data is spread evenly unimodal - ANSWER-way to explain the general shape of a distribution with a single peak multimodal - ANSWER-way to explain the general shape of a distribution with more than one peak bimodal - ANSWER-way to explain the general shape of a distribution with two peaks symmetric - ANSWER-way to explain the general shape of a distribution that has two halves that are approximately mirror images of each other skewed left - ANSWER-way to explain the general shape of a distribution when there is a tail of values extending towards small data values, and this tail is longer than the right tail skewed right - ANSWER-way to explain the general shape of a distribution when there is a tail of values extending towards large data values, and this tail is longer than the left tail range - ANSWER-the difference between the maximum value and minimum value of a data set; calculated as maximum - minimum bar graph - ANSWER-a graph to summarize and organize categorical data consisting of rectangular bars that are separated from each other and the length (or height) of the bar for each category is proportional to the number or percent of individuals in each category line graph - ANSWER-a bar graph with the tops of the bars represented by points joined by lines (with rest of the bar not shown) and are only appropriate for ordered (rather than qualitative) variables that show how a quantity changes over time time series data - ANSWER-data that shows how a quantity changes over time, best displayed graphically with a line graph