Babies 6 to 23 months of age with inner ear infections were given antibiotics.  The children were randomly assigned to receive antibiotics for a full 10 days or to receive antibiotics for 5 days and then a placebo for 5 days.  There were 229 children assigned the shorter course, and 77 of them had "clinical failure" whereas of the 238 assigned to the longer course of antibiotics, 39 had clinical failure. a) Compare the percentage of clinical failure in each group and state which group did better. b) Was this an observational study or a controlled experiment? How do you know? c) Can you conclude that the treatment caused the difference? Why or why not?

Q: his obstetrician also wanted to determine the impact that three experimental diets had on the birth…

A: In a comparative experiment, various objects of comparison are called treatments or factors. Let a…

Q: A researcher conducts an experiment comparing two treatment conditions with 20 scores in each…

A: Given, A researcher conducts an experiment comparing two treatment conditions with 20 scores in each…

Q: In 1950​, an organization surveyed 1100 adults and​ asked, "Are you a total abstainer​ from, or do…

A: Given data,   x1= 396                                                  x2= 319 n1=1100…

Q: In a recent election, 63% of all registered voters participated in voting. In a survey of 275…

A: The percent of participation of voters is equal to: In the given case; when the observation sample…

Q: Of 52 students, it was found that 15 were commuters. If one-quarter of the female students and…

A: Let, x be no of male students y be no of female students Given, x+y=52  -->1 15 were commuters.…

Q: In 1945, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Solution: Given information: n1= 1100 Sample size of adults in 1945 survey  x1= 352 adults indicates…

Q: (b) Has the proportion of adults who totally abstain from alcohol changed? Use the a = 0.10 level of…

A: Here it is given that , of the 1100 adults surveyed, 352 indicated that they were total abstainer.…

Q: A random sample of 1400 Internet users was selected from the records of a large Internet provider…

A: Given data A random sample of 1400 internet users was selected  and asked whether they would use…

Q: Among 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300…

A: Given X=300 n=1815

Q: General Motors wants to know if a newly designed car has a different appeal to people under 30…

A:

Q: Have you ever opened a bag of M&Ms and been surprised at the distribution of colors? We are going to…

A: Given information: Color Brown Red Yellow Orange Green Blue   Count 14 11 10 37 11 19 102…

Q: What proportion of 20% defective shipments will be accepted?

A: Given : N=50 , n=5 , p=0.20 , M=N*p=50*0.2=10 Here , X​​​​​​​Hypergeometric (n=5,N=50,M=10) The…

Q: A random sample of 250 undergraduate students from a large university was found to contain 67…

A:

Q: In a CBS poll of 1289 adults, nationwide, asking whether they favor or oppose teacher and school…

A:

Q: In 1945, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Null and alternative hypotheses: The hypothesis which is tentatively fixed up under and tested for…

Q: What is the sample proportion such that 95% of all others is symmetric around 36%?

A: 1. A sample of 200 students is taken in which 36% of all college students use an Apple i phone only.…

Q: n 1949, an organizâtion surveyed 1100 adults and asked, 'Are you a total abstainer from, or do you…

A: Given data,In old surveyn=1100x=374In recent surveyn=1100x=330

Q: In a CBS poll of 1289 adults, nationwide, asking whether they favor or oppose teacher and school…

A:

Q: n a data gathered by a UST-SHS Health Allied student, it was determined that blood pressure readings…

A: GivenMean(μ)=120standard deviation(σ)=8

Q: In 1942 ​, an organization surveyed 1100   adults and​ asked, "Are you a total abstainer​ from, or…

A: The proportion of considered subjects, on which we are interested from a sample can be termed as…

Q: :5. If in a village actually involved by anthrax, 70 per cent of the goats are attacked and 85 pet…

A:

Q: A researcher conducts an experiment comparing two treatment conditions with 20 scores in each…

A: Statistical experimental design deals with design and analysis of the experiment. This is useful in…

Q: According the the U.S. Census bureau, the percentage of Santa Ana residents with a bachelor's degree…

A: From the provided information,

Q: It is believed that in the upcoming election, 65% of the voters in Baguio City will vote or…

A:

Q: Suppose 50% of all voters in a population support a politican, SHARE What is the zscore of sample…

A:

Q: The sample of 400 tomatoes gave 310 red and 90 green ones. Does it contradict the hypothesis of…

A: Null hypothesis: H0:  The proportion of red and green tomatoes is equal to 3:1. Alternate…

Q: a study is conducted to access the impact of caffeine consumption, smoking, alcohol consumption, and…

A: Given data, p=40%=0.4 n=8 Let X be event that they consume caffiene and smoke. P(X<=6)=?

Q: The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers. The death…

A: Given Information: The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among…

Q: In 1944​, an organization surveyed 1100 adults and​ asked, "Are you a total abstainer​ from, or do…

A: We habe to find given proportion.

Q: group of children are surveyed about their favorite snacks . The results of the survey are shown…

A:

Q: In the study conducted by selecting 100 female and 100 male students in order to test the claim that…

A: given that  p- value=0.0228

Q: At Sundae King, 6 of the last 10 sundaes sold had nuts. Considering this data, how many of the next…

A: We have to find correct answer

Q: group of children are surveyed about their favorite snacks . The results of the survey are shown…

A:

Q: As a part of a class project, a teacher brings a jar of 200 jawbreakers of three different colors,…

A: Given that one student draws 30 jawbreakers from the jar, of which 9 are orange, 11 are red and 10…

Q: In 1949​,an organization surveyed 1100 adults and​ asked, "Are you a total abstainer​ from, or do…

A: Sample 1:In 1949 survey, there are 374 individuals out of 1,100 indicated that they are total…

Q: According to a guide, 46% of cell phone users have only one cell number, 35% have two numbers, 15%…

A: Solution:- from given information claim: if the data from the independent survey contradict the…

Q: If 471 households were surveyed out of which 385 households have internet fiber cable, what is the…

A: Among 471 households 385 households have internet fiber cable, therefore 471-385 = 86 households…

Q: An automotive manufacturer wants to know the proportion of new car buyers who pref foreign cars over…

A: A sample of 897 cars; n=897 304 preferred domestic cars; x=304 α=0.05

Q: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV per…

A: Given: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV…

Q: in 1949, an organization surveyed 1100 adults and asked, 'Are you a total abstainer from, or do you…

A: Solution: Given information: n1=1100 Sample size of1949  adults  n2=1100 Sample size of recent…

Q: In the past, 35% of the students at ABC University were in the Business College, 35% of the students…

A: It is given that the 35% students are in Business College, 35% students are in Liberal Arts College…

Q: In 1949, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: We have to find null and alternate hypothesis.

Q: In 1946, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Let p1 be the proportion of adults took the survey in 1946 and p2 be the proportion of adults took…

Q: According the the U.S. Census bureau, the percentage of Santa Ana residents with a bachelor's degree…

A:

Q: This obstetrician also wanted to determine the impact that three experimental diets had on the birth…

A: Given : The two factors Anova is shown below:

Q: ences the outcome of 12. Brunt, Rhee, and Zhong (2008) surveyed 557 under- graduate college students…

A:

Q: c please     survey of 1000 adults from a certain region​ asked, "If purchasing a used car made…

A: Identify the correct options for the blanks of the confidence interval obtained.   The correct…

Q: A poll found that 71% of people out of a survey of size 130 watch at least three hours of TV per…

A: From the given information,   A poll found that 71% of people out of a survey of size 130 watch at…

Q: In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you…

A: Given that  Sample sizes n1=1100 , n2=1100 Favorable cases x1=440 , x2=418

Q: suppose you select a simple random sample of 75 douglas college student and you find that 8 are left…

A: It is given that the sample size n is 75 and x is 8.

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.