9. a researcher places bacteria samples in two different climates. the research then measures the bacteria…

9. a researcher places bacteria samples in two different climates. the research then measures the bacteria growth in each sample after 3 days.\n11. the computer science teacher asks all 80 students in the programming classes to complete an online form about their coding experience level.\n13. a food product company is researching a new artificial sweetener. the company asks 100 people at a retirement home to rate the taste of a drink on a scale from 1 to 10. half of the people are given tea sweetened with sugar, and half are given tea sweetened with artificial sweetener. then the results from the two groups are averaged.

9. a researcher places bacteria samples in two different climates. the research then measures the bacteria growth in each sample after 3 days.\n11. the computer science teacher asks all 80 students in the programming classes to complete an online form about their coding experience level.\n13. a food product company is researching a new artificial sweetener. the company asks 100 people at a retirement home to rate the taste of a drink on a scale from 1 to 10. half of the people are given tea sweetened with sugar, and half are given tea sweetened with artificial sweetener. then the results from the two groups are averaged.

Answer

Explanation:

Step1: Analyze problem 9

The researcher is manipulating the climate (independent variable) to observe bacteria growth (dependent variable). This is an experiment.

Step2: Analyze problem 11

The teacher is collecting data on students' coding - experience levels without manipulating any variables. This is a survey.

Step3: Analyze problem 13

The food - product company is manipulating the type of sweetener (independent variable) and getting taste ratings (dependent variable). This is an experiment.

Answer:

  1. Experiment
  2. Survey
  3. Experiment