Question 1

From what you have read in this chapter,would you say a 21-year-old Caucasian female can count on caffeinated coffee to reduce her risk of Parkinson disease?

Accepted Answer

The results of the peer-reviewed study that showed reduction in Parkinson disease risk with caffeinated beverage consumption were based on Japanese-American males. It cannot be assumed that the same results would apply to a Caucasian female.

Question 2

What conclusions can be drawn from a hypothesis?

Accepted Answer

If evidence rejects a hypothesis, it must be removed from consideration. However, if there is data to support a hypothesis, it is not automatically accepted as true without further testing. In science, hypotheses are constantly being tested and revised based on new evidence, so acceptance of a hypothesis is not permanent.

Question 3

You are listening to a news report that claims a new study has found convincing evidence that a particular weight-loss product is much more effective than diet and exercise.What can you infer about the "convincing evidence" in this case?

Accepted Answer

Convincing evidence would require statistical testing to show a significant difference between the weight loss of those who used the weight-loss product and those who relied on diet and exercise.

Question 4

A hypothesis is a statement that

Accepted Answer

A hypothesis is a tentative explanation or prediction of a phenomenon. It must be testable and falsifiable, meaning that it can be proven wrong through experimentation, observation, or data analysis. Therefore, a hypothesis can be tested and proven false, making option D the best choice.

Question 5

You hear a news report about a new asthma treatment.What would you want to know before you asked your doctor if this treatment was right for you?

Accepted Answer

All of the options are important to consider before asking the doctor if the new asthma treatment is suitable for an individual. It is important to know if the drug was properly tested in a randomized clinical trial, the number of participants in the trial, if there was a significant difference between the new treatment and the control group, and if any of the researchers have financial ties to the manufacturer, which could potentially lead to bias in the results.

Question 6

What are the criteria for a good hypothesis?

Accepted Answer

A good hypothesis must be both testable and falsifiable. It should be possible to design an experiment or observation that could potentially refute the hypothesis if it were not true. This means that the hypothesis must be specific enough to make predictions that can be tested, and it should not rely solely on anecdotal evidence or personal beliefs. Peer-review and realism are also important factors, but they are not necessary criteria for a hypothesis to be considered good.

Question 7

You carry out a clinical trial to test whether a new drug relieves the symptoms of arthritis better than a placebo.You have four groups of participants,all of whom have mildly painful arthritis (rated 6 on a scale of 1 to 10).Each group receives a daily pill as follows: group 1 (control),placebo;group 2,15 mg;group 3,25 mg;group 4,50 mg.At the end of 2 weeks,participants in each group are asked to rate their pain on a scale of 1 to 10.The mean pain rating of the participants was 6.5 for the placebo,6.0 for 15 mg of the drug,4.5 for 25 mg of the drug,and 4.5 for 50 mg of the drug.What is your next step?

Accepted Answer

The next step should be to run a statistical analysis to determine if the differences in mean pain ratings between the groups are significant. This will help determine if the drug is truly effective in relieving arthritis pain or if the differences observed could have occurred by chance. It is important to rely on statistical analysis to make informed decisions rather than jumping to conclusions or making investment decisions based on preliminary results.

Question 8

What are the steps used in the process of a scientific study?

Accepted Answer

The steps used in the process of a scientific study involve making initial observations that generate questions, studying the literature to gain background knowledge, generating hypotheses that are both testable and falsifiable, testing the hypothesis with experiments, analyzing the data to draw accurate conclusions, and making conclusions that are supported by the data. Option A accurately depicts these steps in order. Option B only includes conducting experiments and researching literature without generating testable hypotheses, while Option C includes conducting experiments based on literature without generating testable hypotheses prior. Option D limits the generation of hypotheses to published literature, when hypotheses can also be generated from personal observations and questioning.

Question 9

What is the importance of statistical analyses?

Accepted Answer

The answer of What is the importance of statistical analyses?
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Question 10

A hypothesis can be everything EXCEPT

Accepted Answer

A hypothesis cannot be proven true, only supported by evidence. Scientific knowledge is always provisional and subject to revision based on new evidence.

Question 11

I notice that all the students in my class seem very drowsy 45 minutes into my class period.Knowing that it could not possibly be my lecture putting them to sleep,I consider other factors such as the fact that my class is at 5 P.M.and the sun is usually setting at that time of the day,which I think may make people drowsy.What type of evidence am I collecting in making this observation?

Accepted Answer

The evidence being collected is anecdotal, based on personal observation and experience, and not necessarily supported by rigorous scientific studies or research.

Question 12

The scientific process from beginning to end can be outlined as:

Accepted Answer

The scientific process begins with observation, which leads to identifying a question or problem. A hypothesis is then formulated, followed by the testing of that hypothesis through experimentation or further observation. The data collected during testing is then analyzed to draw conclusions about the validity of the original hypothesis. This process ends with a conclusion that may support or reject the hypothesis.

Question 13

Where are the most reliable scientific results published?

Accepted Answer

Peer-reviewed scientific journals are the most reliable source for scientific results because they undergo a rigorous review process by experts in the field before publication, ensuring the validity and accuracy of the findings. Daily news, science magazines, and scientific websites may report on scientific research, but they may not necessarily go through the same level of scrutiny and verification as peer-reviewed journals.

Question 14

All of the following are true of a scientific hypothesis EXCEPT

Accepted Answer

A scientific hypothesis is not an opinion, but rather a testable explanation for an observation.

Question 15

How can two different studies investigating the same thing (e.g. ,the relationship,if any,between caffeinated coffee and memory)come to different conclusions?

Accepted Answer

All of these factors can influence the outcome of a study and, therefore, two different studies investigating the same thing may come to different conclusions based on these varying factors. A difference in sample size, participant demographics, caffeine dosage, or memory evaluation method could all impact the results and lead to different conclusions.

Question 16

What is the importance of peer review in the scientific process?

Accepted Answer

Peer review is crucial in ensuring that a study has been designed appropriately and that the results have been correctly interpreted. This helps to ensure the validity and reliability of the research, and it allows other scientists to replicate the study and build upon its findings. Through the peer review process, any flaws or errors in the study can be identified and corrected before the research is published.

Question 17

Which of the following places the steps of the scientific process in the correct order?

Accepted Answer

The correct sequence in the scientific process typically starts with asking questions, followed by reading literature to understand the background, formulating a hypothesis, conducting experiments to test the hypothesis, and finally drawing conclusions based on the experimental results.

Question 18

Observations used as scientific evidence should NOT include

Accepted Answer

Anecdotal evidence is based on personal experience or hearsay and is not considered reliable scientific evidence. Scientific evidence should be based on empirical data that can be replicated and tested.

Question 19

What is the first step in the scientific process?

Accepted Answer

The first step in the scientific process is to formulate a hypothesis. A hypothesis is an educated guess or proposed explanation for a phenomenon. This step is crucial because it sets the direction for the rest of the study and helps scientists to develop a clear question to answer through experimentation.

Question 20

Based on previous published data and some preliminary experiments done in my lab,I hypothesize that a drug called "shrinkase" will inhibit the growth of a particular type of cancerous tumor.What is my next step in the scientific process?

Accepted Answer

The next step in the scientific process would be to determine the control and experimental groups to use in testing the hypothesis. This is necessary to ensure that any observed effects are due to the drug and not to other factors. Once this is determined, experiments can be carried out to test the hypothesis. After analyzing the results of these experiments, they can be submitted for peer review to validate the findings. Finding people with the type of tumor and obtaining a supply of the drug would also be important steps, but they would likely come after determining the experimental design.

Quiz 1: Process of Science