EBK BUSINESS STATISTICS
7th Edition
ISBN: 8220102743984
Author: STEPHAN
Publisher: PEARSON
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Trichotillomania is an illness characterized by the repeated urge to tear out hair, eyelashes, facial hair, nose hair, pubic hair, eyebrows, or other body hair, sometimes resulting in noticeable bald patches. A pharmaceutical company is trying to decide whether to market a drug to treat trichotillomania. The pharmacist who designed the drug believes it is very effective, especially when combined with therapy, whereas a researcher who did research on a sample of people suffering from the disorder is less convinced. Each of them created graphs to support his or her position.
Determine whether the pharmacist or the researcher created each graph. (Hint: Decide whether the graph minimizes or maximizes the effect of the drug first. Then decide who would want to do that, and choose your response from the list of possible combinations.)
Many consumer groups feel that the U.S. Food and Drug Administration (FDA) drug approval process is too easy and, as a result, too many drugs are approved that are later found to be unsafe. On the other hand, a number of industry lobbyists have pushed for a more lenient approval process so that pharmaceutical companies can get new drugs approved more easily and quickly. The FDA wants to set up a hypothesis test to show that the new drug is safe before approving it by assuming it to be unsafe.
Match the followings concepts to their correct interpretations in the context of the question:
Null hypothesis
Alternative hypothesis
Type I error
Type II error
A.
The new drug is unsafe but the FDA concludes that it is…
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- The popular show 13 Reasons Why is organized around the suicide of the 17-year-old Hannah, In the show, Hannah herself describes reasons why she decided to kill herself. One of the early episodes originally depicted her suicide in graphic detail. Some critics and mental health advocates argued that the series represented suicide irresponsibly and worried that the show would lead to copycat suicides or self-harm. To test the effect of the show, Niederkrotenthaler et al. (2019) first used social media to determine the exact months of the year when the show was being discussed. They found that public attention was highest during April 2017. What type of design did they use? Group of answer choices Interrupted time-series design Nonequivalent control group posttest-only design Quasi-independent variable None of the abovearrow_forwardResearchers were interested in whether older parents had different parenting styles when compared to younger parents. Parenting styles were classified into one of three categories: permissive, authoritative or dictatorial. What is the null and alternate hypothesis?arrow_forwardIt appears that there is some truth to the old adage “That which doesn’t kill us makes us stronger.” Seery, Holman, and Silver (2010) found that individuals with some history of adversity report better mental health and higher well-being compared to people with little or no history of adversity. In an attempt to examine this phenomenon, a researcher surveys a group of college students to determine the negative life events that they experienced in the past 5 years and their current feeling of well-being. For n = 18 participants with 2 or fewer negative experiences, the average well-being score is M = 42 with SS = 398, and for n = 16 participants with 5 to 10 negative experiences the average score is M = 48.6 with SS = 370. a.) Is there a significant difference between the two populations represented by these two samples? Include whether you reject or retain the Null Hypothesis. Use a two-tailed test with α = 0.01 b.) Compute Cohen’s d to measure the size of the effect. c.) Write a…arrow_forward
- It appears that there is some truth to the old adage “That which doesn’t kill us makes us stronger.” Seery, Holman, and Silver (2010) found that individuals with some history of adversity report better mental health and higher well-being compared to people with little or no history of adversity. In an attempt to examine this phenomenon, a researcher surveys a group of college students to determine the negative life events that they experienced in the past 5 years and their current feeling of well-being. For n = 16 participants with 2 or fewer negative experiences, the average well-being score is M = 42 with SS = 398, and for n = 16 participants with 5 to 10 negative experiences the average score is M = 48.6 with SS = 370. Is there a significant difference between the two populations represented by these two samples? Use a two-tailed test with α = .01 [use the 4-step procedure]. [Remember to assess whether the assumption of homogeneity of variances is satisfied or not, alpha = .01…arrow_forwardDo sit down restaurant franchises and fast food franchises differ significantly in stock price? Specifically, is the average stock price for sit-down restaurants different from the average stock price for fast food restaurants? If sit down restaurants are considered group 1 and fast food restaurants are group 2, what are the hypotheses of this scenario?arrow_forwardAlthough most medical experts agree that vaccinations are completely safe and one of the greatest medical developments of the 20th century, vaccine hesitancy still exists. A Gallup poll taken in 2019 sampled 900 adults in the United States. Of these people, 136 said that they believed that vaccinations were more dangerous than the diseases they prevented. A group promoting vaccine hesitancy claims that more than 15% of Americans believe vaccines to be more dangerous than the diseases they prevent. Does the data support the claim of the group promoting vaccine hesitancy? Use ? = 0.05.arrow_forward
- Would an observational study or an experiment be more appropriate for a medical research team that is trying to figure out if a new medicine is effective in treating migraines? Justify your response.arrow_forwardIt is now generally accepted that cigarette smoking causes heart disease, lung cancer, and many other dis- eases. However, in the 1950s, this idea was controversial. There was a strong association between smoking and ill-health, but association is not causation. R. A Fisher advanced the "constitutional hypothesis: there is some genetic factor that disposes you both to smoke and to die. To refute Fisher's idea, the epidemiologists used twin studies. They identified sets of smoking-discordant monozygotic twin pairs. "Monozygotic" twins come from one egg and have identical genetic makeup; "smoking-discordant" means that one twin smokes, the other does not. The researchers collected data on which twin dies first, the smoker or the non-smoker. The data from a Finnish twin study are shown in the following table. Smokers Non-smokers All Causes 17 5 Coronary heart disease Lung Cancer 9 According to the first line of the table, there were 22 smoking-discordant monozygotic twin pairs where at…arrow_forwardA colon cancer screening study is being conducted in Nottingham, England. Individuals 50 to 75 years old will be screened with the Hemoccult test. In this test, a stool sample is tested for the presence of blood. If the Hemoccult test result is negative, no further testing is done. If the Hemoccult test result is positive, the individual will have a second stool sample tested with the Hemoccult II test. If this second sample also tests positive for blood, the individual will be referred for more extensive evaluation. What is the effect on net sensitivity and net specificity of this method of screening? Net sensitivity is decreased and net specificity is increased Net sensitivity and net specificity are both increased Net sensitivity remains the same and net specificity is increased Net sensitivity is increased and net specificity is decreased. The effect on net sensitivity and net specificity cannot be determined from the dataarrow_forward
- Many high schools now have drug-testing programs for athletes. The main goal of these programs is to reduce the use of banned substances by students who play sports. It is not practical to test every athlete for drug use regularly. Instead, school administrators give drug tests to randomly selected student athletes at unannounced times during the school year. Students who test positive face serious consequences, including letters to their parents, required counseling, and suspension from athletic participation. Drug tests aren't perfect. Sometimes the tests say that athletes took a banned substance when they did not. This is known as a false positive. Other times, drug tests say that athletes are "clean" when they did take a banned substance. This is called a false negative. Suppose that 16% of the high school athletes in a large school district have taken a banned substance. The drug test used by this district has a false positive rate of 5% and a false negative rate of 10%. If…arrow_forwardMany high schools now have drug-testing programs for athletes. The main goal of these programs is to reduce the use of banned substances by students who play sports. It is not practical to test every athlete for drug use regularly. Instead, school administrators give drug tests to randomly selected student athletes at unannounced times during the school year. Students who test positive face serious consequences, including letters to their parents, required counseling, and suspension from athletic participation. Drug tests aren't perfect. Sometimes the tests say that athletes took a banned substance when they did not. This is known as a false positive. Other times, drug tests say that athletes are "clean" when they did take a banned substance. This is called a false negative. Suppose that 16% of the high school athletes in a large school district have taken a banned substance. The drug test used by this district has a false positive rate of 5% and a false negative rate of 10%. If…arrow_forwardA serious side effect of allergy medicines is that they cause drowsiness, which can cause many problems for the individuals taking them. In recent years, a new non-drowsy allergy medicine has been developed. The company that created the medicine claims to be the first, once-a-day, non-drowsy allergy medicine (call it Medicine A). An independent research group wanted to check on this claim by comparing Medicine A with another allergy medicine not advertised as non-drowsy (call it Medicine B). A random sample of 3,193 allergy sufferers was selected and each individual was randomly assigned to take either Medicine A or Medicine B. From the Medicine A group, 114 of 1,604 reported drowsiness and from the Medicine B group, 155 of 1,589 reported drowsiness. a) Calculate and label the two sample proportions separately. Next, calculate the difference between these sample proportions by subtracting (Medicine A – Medicine B). Complete these calculations by hand, label each of them, and present…arrow_forward
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