A scientist is conducting a study to determine how well a new medication treats ear infections. The scientist tells the participants to put 10 drops in their infected ear each day. After two weeks, all participants' ear infections had healed. Which of the following changes to the design of this study would most improve the ability to test if the new medication effectively treats ear infections?Have participants put ear drops in both their infected ear and healthy earCreate a second group of participants with ear infections who do not use any ear dropsCreate a second group of participants with ear infections who use 15 drops a dayHave participants use ear drops for only one week

A cosmetic company wanted to demonstrate the benefit of using their skincare for dark skin treatments. A sample of six was obtained, and each participant used it for 30 days. After 30 days, the scores were as follows:ParticipantBefore treatmentAfter treatment117222161931921415175121861318Is there any significant difference after 30 days? Use α = 0.05.a.Use paired t-test and there is a difference after 30 days of treatment.b.Use ANOVA test and there is a difference after 30 days of treatment.c.Use Z-test and there is a difference after 30 days of treatment.d.Use 2-sample t-test and there is a difference after 30 days of treatment.

In a recent study to establish the effectiveness of a new cancer drug, subjects were randomly divided into three groups. Group A got a known and effective cancer drug, group B got the new experimental compound, and group C got a combination of the two drugs. None of the individuals nor the nurses knew group assignments, and nurses administering the drugs did not know what drug was being administered to their patients.Which of the following is a correct statement about this study? It was a blind study because subjects did not know the treatment they were receiving. It was a double-blind study because neither the subject nor the experimenter knew what the treatment for a patient was. It was not a blind study because there was no placebo. It was not a blind study because patients knew they were participating in a study.

In a recent study to establish the effectiveness of a new cancer drug, subjects were randomly divided into three groups. Group A got a known and effective cancer drug, group B got the new experimental compound, and group C got a combination of the two drugs. None of the individuals nor the nurses knew group assignments, and nurses administering the drugs did not know what drug was being administered to their patients.Which of the following is a correct statement about this study? It was a blind study because subjects did not know the treatment they were receiving. It was a double-blind study because neither the subject nor the experimenter knew what the treatment for a patient was. It was not a blind study because patients knew they were participating in a study. It was not a blind study because there was no placebo.

Sarah is a researcher at a children's psychiatric center. Her office has just been asked to conduct a pilot study on a new prescription medication used to treat anxiety called Drug X. Sarah wants to figure out if Drug X causes a reduction in anxiety-like the drug company claims. How can Sarah answer this question through a true experiment? Group of answer choicesSarah needs to randomly assign half of her participants to the treatment group and half to a control group for her studySarah needs to conduct a field experiment and should not worry about the random assignment of participants.Sarah needs to randomly assign her participants, and she must only conduct her study at different stages of participants’ lives.

A group of scientists is conducting an experiment on the effects of media on children. They randomly select 100 children and randomly assign each child to one of four treatment groups. Each treatment group has a specific amount of screen time during a one-week time frame. The first group has no screen time, the second group has two hours of screen time, the third group has four hours of screen time, and the fourth group has six hours of screen time.After the first week, the scientists conduct the same experiment, with the same subject groups, for three more weeks so that each group experiences each of the four treatments.Which statements about this study are true? This study uses blocking. This study uses blinding. This study uses random sampling. This study uses a repeated measures design. This study uses a control group.