Stats

• Why is it considered bad if a graph is misleading?

  It can lead to incorrect interpretations of the data
• What is one major issue with the bar chart mentioned in the video?

  It lacks numerical labels to indicate the scale of the bars
• What does the absence of numbers on the graph imply?

  It prevents viewers from understanding the data accurately
• What is a broken bar in a graph?

  A gap in the bar that indicates missing data
• Why is a 3D bar chart considered problematic?

  It makes it harder to read and interpret the data accurately
• What is represented by the variable X in the context of dog breeds?

  Mean weight of the dogs
• What does the variable Y represent in the context of dog breeds?

  Mean life expectancy of the dogs
• What does correlation indicate in statistics?

  How two variables are related to each other
• What does a positive correlation look like on a scatter graph?

  Points that trend upwards from left to right
• What does a negative correlation indicate?

  As one variable increases, the other decreases
• What does the downward slope of points on a scatter graph indicate?

  It indicates a negative correlation between the variables
• What does it mean to interpret data in a statistical context?

  To explain what the data signifies in real-life terms
• What is the interpretation of the correlation between mean weight and life expectancy of dogs?

  As mean weight increases, life expectancy decreases
• What is the mean weight of the eight breeds of dogs represented in the statistics?

  $34.1 \text{ kg}$
• What is the mean life expectancy of the eight breeds of dogs represented in the statistics?

  $11.2 \text{ years}$
• How do you plot the mean point on a scatter graph?

  By locating the coordinates $(34.1, 11.2)$ on the graph
• What is a line of best fit?

  A straight line that best represents the data on a scatter graph
• What is the purpose of drawing a line of best fit through the mean point?

  To provide a visual representation of the trend in the data
• What does extrapolation mean in statistics?

  Estimating values outside the range of known data points
• What percentage of graduates from the West Midlands were unemployed?

  7.1%
• How is the percentage of permanent UK employment related to temporary UK employment for graduates in the Southeast?

  The percentage of permanent employment is twice that of temporary employment
• Which area of study has a ratio of permanent to temporary UK employment that is double?

  The West Midlands
• What is the total percentage of graduates from London who went into some type of employment?

  60.9%
• Why might the total percentage of graduates not equal 100%?

  Some graduates may not have responded to the questionnaire
• What is the significance of the questionnaire used for gathering data?

  It collects information on graduates' destinations after completing their degrees
• What is the main focus of the research being conducted by the university student?

  To investigate the effects of drinking Coca-Cola before bedtime on blood pressure
• What percentage of the surveyed students responded to the questionnaire?

  91.6 percent
• What method was used to gather information from the students?

  A questionnaire
• Why might not all students have responded to the questionnaire?

  Some might not have bothered answering it
• What is the hypothesis in research?

  A prediction about what you think will happen
• What is the hypothesis regarding drinking cocoa before bedtime?

  Drinking cocoa before bedtime reduces blood pressure
• What is the difference between a sample and a census?

  A sample involves asking a subset of people, while a census involves asking everyone
• Why is it better to use a sample instead of a census?

  It is easier and quicker to collect data
• What is a sampling frame?

  A list of all students from which a sample can be drawn
• What sampling method should be used to ensure representation of more females than males?

  Stratified sampling
• If there are 100 students with 60 males and 40 females, how many males should be selected in a sample of 10 using stratified sampling?


  6 males
• Why are control groups important in investigations?

  They help determine if the treatment caused the observed change
• What is a two-center holiday?

  A holiday in which people can visit two cities
• What is required to complete the two-way table for holidays booked in 2010?

  The totals for each row and column
• How do you calculate the total number of holidays booked to Venice and Rome?

  Add the number of holidays booked to Venice and the number booked to Rome