a medical researcher wishes to investigate whether oil consumption in pregnant mothers and the subsequent development...

a medical researcher wishes to investigate whether oil consumption in pregnant mothers and the subsequent development of asthma in their children, the researcher randomly assigned 736 pregnant women at 24 weeks of gestation to receive fish oil or a placebo (olive oil) daily, Neither the researcher nor the participants were aware of the group assignment during follow up for the first 3 years of the children lives, after which there was a 2year follow up period during which only the investigations were unaware of group assignment .

what type of data collection method would this scenario be considered?

A Anecdotal evidence.

B a controlled experiment

c a cluster sample

d an observational study

Expert Solution

a medical researcher wishes to investigate whether oil consumption in pregnant mothers and the subsequent development of asthma in their children, the researcher randomly assigned 736 pregnant women at 24 weeks of gestation to receive fish oil or a placebo (olive oil) daily, Neither the researcher nor the participants were aware of the group assignment during follow up for the first 3 years of the children lives, after which there was a 2year follow up period during which only the investigations were unaware of group assignment .

what type of data collection method would this scenario be considered?

A Anecdotal evidence.

This is type of evidence is separate from statistical evidence. Where statistical is obtained from data eg. mean, anecdotal is based on people's testimony (what they feel) irrespective of the actual. Here no where it is mentioned tht people (mothers) had to give any testimonies.

B a controlled experiment

Control experiment is where there is one control group which is not given any treatment (placebo) and the other which is given the treatment and the results are compared to check whether the treatment does have any effect or not.

c a cluster sample

When people are put into groups and sampled together from 1 area and compared with others, it is cluster sampling. Since no clusters are there in this sample.

d an observational study

Observational is where the results are simply obtained based on what is observed without any treatment.

orchestra answered 1 year ago

A study was conducted on pregnant women and the subsequent development of their children. One of...

A study was conducted on pregnant women and the subsequent development of their children. One of the questions of interest was whether the IQ of children would differ for mothers who smoked at least 10 cigarettes a day during pregnancy and those who did not smoke at all. The mean IQ at age 4 for the children of the 66 nonsmokers was 113.04 points, while for the children of the 47 smokers, it was 103.17 points. The standard deviations were...

A medical researcher wishes to see whether the pulse rate of smokers are higher than the...

A medical researcher wishes to see whether the pulse rate of smokers are higher than the pulse rates of non-smokers. Samples of 100 smokers and 100 nonsmokers are selected. The results are shown below. Can the researcher conclude at an alpha = 0.05, that smokers have higher pulse rates than nonsmokers? (20 points) SmokersNon. Smokers Mean= 90 b. Mean = 88 Standard Deviation = 5. Standard Deviation = 6

. Dr. Chappel wishes to investigate the relationship between birthweight and the estriol level of pregnant...

. Dr. Chappel wishes to investigate the relationship between birthweight and the estriol level of pregnant women. A random sample of eight women were chosen in a Houston hospital and Dr. Chappel tabulated her data as follows. Estriol (mg/24 hr) 9 14 21 16 24 25 18 20 Birthweight (g/100) 25 27 30 32 28 36 29 38 Calculate Pearson’s correlation coefficient r. Calculate a t statistic that can be used to test whether the amount of exercise and blood...

A researcher is interested in whether infants’ attention to their mothers’ voices increases in the first...

A researcher is interested in whether infants’ attention to their mothers’ voices increases in the first week of life. Let’s assume an established baseline exists showing that infants attend to their mothers, on average, for 5.867 seconds on their first day. The researcher selects 15 full-term infants in normal health who experienced uncomplicated deliveries and tests the number of seconds the infants oriented in the direction of their mother’s voice on Day 7 after delivery. Here are the results: 7,...

researcher wishes to investigate the effects of nitrogen fertilizer on the growth of hot pepper. The...

researcher wishes to investigate the effects of nitrogen fertilizer on the growth of hot pepper. The land available for the study is sloping in a north-south direction and appears to have a fertility gradient in an east-west direction. (a) Choose an appropriate experimental design and give reasons for your choice. (b) Write an appropriate null hypothesis. (c) Identify the target population in this study. (d) State the possible sources of variation in the experiment. (e) Provide a diagrammatic representation of...

A medical researcher is interested in the prenatal care received by pregnant women in inner cities....

A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 20 randomly selected women with children on the streets of Baltimore and finds that the average number of gynecological check ups per pregnancy was 4, with a standard deviation of 1. Using a 95% level of confidence, estimate the population mean number of gynecological visits per pregnancy. Write a concluding statement. An educational researcher sought to estimate the average number of close...

A researcher wishes to conduct a study on differences in protein consumption by country of origin...

A researcher wishes to conduct a study on differences in protein consumption by country of origin amongst immigrants in NYC. The researcher selects a sample of patients from the population of interest. The data below represents the ages of patients enrolled in the study. 52 52 63 55 33 47 71 48 30 52 45 52 40 55 67 57 45 43 49 45 45 38 44 46 53 58 61 44 !a. Construct the frequency distribution of patient ages....

4. A statistical researcher wishes to investigate the relationship between a student’s study time and their...

4. A statistical researcher wishes to investigate the relationship between a student’s study time and their ultimate exam grade for that exam. The following data is determined: X=study time(hours) 4 7 8 9 12 Y=exam grade (1 to 25 scale) 11 16 14 22 17 Ex=40 Ex2=354 and Exy=670 Ey=80 Ey2=1346 Sketch the scatter diagram. Does the trend appear to be positive or negative? given that E(x-xbar)2=34, Please use that comment to help determine the sample standard deviation for the...

2. A researcher wishes to determine whether there is a difference in the average age of...

2. A researcher wishes to determine whether there is a difference in the average age of elementary school, high school, and community college teachers. Teachers are randomly selected from each group. Their ages are recorded below. Test the claim that at least one mean is different from the others. Use α = 0.01. Resource: The One-Way ANOVA Identify the null hypothesis, Ho, and the alternative hypothesis, Ha. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed. Find the critical...

You, as a researcher, were asked to investigate differences in fruit and vegetable consumption among males...

You, as a researcher, were asked to investigate differences in fruit and vegetable consumption among males and females in your city. Suggest three different probabilistic sampling methods to design this study. The sampling frame must be also stated. Explain your answers.

Question