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A researcher wants to assess the effects of taking prenatal vitamins on the health of newborns, using the newborn weight as the response variable. Explain why it might be inappropriate to use a designed experiment to address this research objective. Choose the correct answer below. O A. A designed experiment would suffer more than an observational study from the effects of confounding and lurking variables. O B. A designed experiment would not allow the researcher to claim causation, only association, between prenatal vitamins and newborn health. O C. A designed experiment would be retrospective and would require that women remember and truthfully report whether or not they took prenatal vitamins. O D. Since there is a perceived benefit to taking prenatal vitamins, there would be ethical issues in intentionally denying them to some pregnant women.This boxplot shows the distribution of ages for a class of 20 students. Why is there no line in the box to indicate the median age? AAge 22- 20- 18- 16- Variable Choose the correct answer below. O A. The median could not be computed for this data. O B. The median value is equal to the third quartile. O c. The median value is equal to either the first or third quartile. O D. The median value is equal to the first quartile.Suppose a newspaper surveys 250 adults in a nearby town and inquires about their cellphone carrier, The accompanying table summarizes the results Does this table describe a Carrier Percent relative frequency distributien'? Why or why not? CarrierA 30 Carrier B 30 Carrier C 10 Carrier D 20 Carrier E 5 Choose the correct answer below. 0 A_ Yes, Categories are given, along with their corresponding percents, O B. No. The percents must be written as decimals in a relative frequency distribution. 0 c_ No. The sum of the relative frequencies is 95%, not 100%. O D_ No. Frequencies should be stated instead of percents Identify the lower class limits, upper class limits, Blood Platelet Count of class width, class midpoints, and class Males (1000 cells/ul) Frequency boundaries for the given frequency distribution. 0-99 3 Also identify the number of individuals included 100-199 50 in the summary. 200-299 82 300-399 14 400-499 0 500-599 - O 600-699 Identify the lower class limits (in 1000 cells/JL). .0.0.0.0.0.0 (Type integers or decimals. Do not round. Use ascending order.) Identify the upper class limits (in 1000 cells/JL). J.0.0.0.0.0.0 (Type integers or decimals. Do not round. Use ascending order.) Identify the class width (in 1000 cells/uL). (Type an integer or a decimal. Do not round.) Identify the class midpoints (in 1000 cells/UL). 0.0.0.0.0.0.0 (Type integers or decimals. Do not round. Use ascending order.) Identify the class boundaries (in 1000 cells/pL).Identify what is wrong. Twelve nutritionists are each paid $100,000 to try a new celebrity diet on ten of their clients and then write a report summarizing the results. Based on the sample results, it is found that the diet is effective for 118 of the 120 people. OD Choose the correct answer below. O A. The sample of clients is self-selected. O B. The results have statistical significance but do not have practical significance. O C. The sample of nutritionists is self-selected O D. The nutritionists have a special interest to obtain results that are favorable to their backers