Scientific knowledge is _________ and open to change. (2 points)

A scientist wants to know if consuming fast food increases obesity in teens. He interviews 500 nutritionists, and 450 of them believe fast food consumed more than once a week increases obesity. The scientist concludes that consumption of fast food increases obesity. Why is the scientist’s conclusion most likely unreliable? (2 points)

Daniel plans to have a garage sale. Research trends suggest that the best time to have a garage sale is before major U.S. holidays, when people are looking for discounted purchases. Based on scientific knowledge and trends, which of these would be the most favorable month for Daniel to have a garage sale? (2 points)

Which of these statements best describes a situation where science is used? (2 points)

What is the name for the type of graph shown in the image below? (2 points)

Which of the following is an SI base unit for measuring length? (2 points)

A student did an experiment with two identical fish tanks, Tank 1 and Tank 2. About 20 mL water purifier was added to Tank 1 and 10 mL water purifier was added to tank 2. Both tanks were heated to 88° F. The water purity of each tank was tested every day in particles per liter. The purity was recorded over a period of 5 weeks in the table shown below.   Week Water Purity of Tank 1 Water Purity of Tank 2 1 12.6 12.6 2 13.7 13.9 3 14.3 14.4 4 15.7 15.8 5 17.6 17.6   Based on the table, which of these conclusions is correct? (2 points)

The durability of scientific knowledge depends on _________ investigation. (2 points)

Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. Select different locations to collect water samples in the pond. Collect a 5-mL water sample at 8 am at a different location each day for 10 days. Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not valid? (2 points)

A scientist wants to find the percent of teens that like the taste of “brand X” lemonade over “brand Y” lemonade. She conducts a taste test of 500 teenagers. She gives each teen a bottle of lemonade with the labels showing the brand of each lemonade. She asks each teenager to taste each brand after drinking water in between. She finds that 50% of teens like brand X and 50% like brand Y lemonade. Why are the results of the survey most likely unreliable? (2 points)