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WorksheetsTOPIC 1 DAY 3 EXPERIMENTAL DESIGN
Total questions: 5
Worksheet time: 15mins
A group of scientists has collected data about breathing problems in two cities. About the same number of people live in each city. The bar graph below shows the number of children in each city who have been diagnosed with asthma.
The scientists want to test the hypothesis that something in the environment in City A is causing the higher rate of asthma in children. They recruit families for a study of asthma in children ages 10-12. The children are divided into three groups. The first group is sent to a summer camp in the country for eight weeks. The second group is sent to a camp in City B for eight weeks. Children in the third group are sent to day camps in their own neighborhoods. A nurse at each camp keeps a record of any reported breathing problems. At the end of the summer, the scientists will compare the rates of asthma symptoms in each group of children.
The scientists want to extend the investigation to explain the data in the graph. Which question would be most useful in determining how environmental factors affect asthma rates?
How many children’s parents have asthma?
What is the level of air pollution in each city?
How many hospitals in each city treat children with asthma?
How many of the children with asthma take allergy medication?
A group of scientists has collected data about breathing problems in two cities. About the same number of people live in each city. The bar graph below shows the number of children in each city who have been diagnosed with asthma.
The scientists want to test the hypothesis that something in the environment in City A is causing the higher rate of asthma in children. They recruit families for a study of asthma in children ages 10-12. The children are divided into three groups. The first group is sent to a summer camp in the country for eight weeks. The second group is sent to a camp in City B for eight weeks. Children in the third group are sent to day camps in their own neighborhoods. A nurse at each camp keeps a record of any reported breathing problems. At the end of the summer, the scientists will compare the rates of asthma symptoms in each group of children.
What is the independent variable in the experiment involving children?
the ages of the children with asthma
the severity of the asthma symptoms
the number of children with asthma
where the children spend the summer
A group of scientists has collected data about breathing problems in two cities. About the same number of people live in each city. The bar graph below shows the number of children in each city who have been diagnosed with asthma.
The scientists want to test the hypothesis that something in the environment in City A is causing the higher rate of asthma in children. They recruit families for a study of asthma in children ages 10-12. The children are divided into three groups. The first group is sent to a summer camp in the country for eight weeks. The second group is sent to a camp in City B for eight weeks. Children in the third group are sent to day camps in their own neighborhoods. A nurse at each camp keeps a record of any reported breathing problems. At the end of the summer, the scientists will compare the rates of asthma symptoms in each group of children.
What is the dependent variable in the experiment involving children?
the ages of the children with asthma
the severity of the asthma symptoms
the number of children with asthma
where the children spend the summer
A group of scientists has collected data about breathing problems in two cities. About the same number of people live in each city. The bar graph below shows the number of children in each city who have been diagnosed with asthma.
The scientists want to test the hypothesis that something in the environment in City A is causing the higher rate of asthma in children. They recruit families for a study of asthma in children ages 10-12. The children are divided into three groups. The first group is sent to a summer camp in the country for eight weeks. The second group is sent to a camp in City B for eight weeks. Children in the third group are sent to day camps in their own neighborhoods. A nurse at each camp keeps a record of any reported breathing problems. At the end of the summer, the scientists will compare the rates of asthma symptoms in each group of children.
What is the control group in the experiment involving children?
the group of children without asthma
the group of children sent to city
the group of children sent to the country
the group of children who stay home
A student wants to investigate the effect of different pH levels on the growth rate of E. coli bacteria. They prepare five petri dishes with identical nutrient agar but adjust the pH of each to 4, 5, 6, 7, and 8. They inoculate each dish with a small amount of E. coli, then place all the dishes near a window to incubate for 48 hours. At the end of the experiment, the student measures bacterial growth in each dish.
Which factor in this experiment is most likely to reduce the reliability of the results?
The use of five different pH levels to test bacterial growth.
The placement of all petri dishes near a window, where light and temperature may vary.
The decision to measure growth after exactly 48 hours.
The use of the same type of nutrient agar in all petri dishes.
