In a previous study, it has already been determined that a common ADD treatment is effective, but researchers want to determine what dosage level is most appropriate. You set up an experiment to consider the factor of dosage with two levels (300mg vs. 500mg). What would be the different treatment groups of the experiment within each block? Three groups: no drug/300mg of new drug/500mg of new drug Three groups: placebo/300mg of new drug/500mg of new drug Two groups: 300mg of new drug/500mg of new drug Two groups: placebo/ either 300 or 500mg of new drug
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In a previous study, it has already been determined that a common ADD treatment is effective, but researchers want to determine what dosage level is most appropriate. You set up an experiment to consider the factor of dosage with two levels (300mg vs. 500mg). What would be the different treatment groups of the experiment within each block?
- Three groups: no drug/300mg of new drug/500mg of new drug
- Three groups: placebo/300mg of new drug/500mg of new drug
- Two groups: 300mg of new drug/500mg of new drug
- Two groups: placebo/ either 300 or 500mg of new drug
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- A drug trial had 161 participants. A survey was done to gather information about the participants’ experiences with side effects. The table below gives the results for two possible side effects.A health officer is trying to study the malaria situation of Zambia. From the records of seasonal blood survey (SBS) results he came to understand that the proportion of people having malaria in Zambia was 3.8% in 2015. The size of the sample considered was 15,000. He also realized that during the year that followed (2016), blood samples were taken from 10,000 randomly selected persons. The result of the 2016 seasonal blood survey showed that 200 persons were positive for malaria. Help the Health officer in testing the hypothesis that the malaria situation of 2016 did not show any significant difference from that of 2015 (take the 5% level of significance).Peter is conducting an experiment to determine whether a new medication is effective in reducing swelling. He gets 1,500 volunteers with swelling and divides them into two groups. The control group does not receive any medication; the treatment group receives the medicationThe patients in the treatment group show reduced signs of swelling. What can Peter conclude from this experiment?
- A phamaceutical company wants to test the effectiveness of a new allergy drug. The company identifies 250 females 30-35 years old who suffer from severe allergies. The subjects are randomly assigned into two groups. One group is given the new allergy drug and the other is given a placebo that looks exactly like the new allergy drug. After six months, the subjects' symptoms are studied and compared. Answer parts (a) through (c) below. O B. The experimental units are the symptoms from the drug. The treatment is the new allergy drug. O C. The experimental unit is the new allergy drug. The treatments are the severe allergies the patients suffer from. O D. The experimental units are the 30- to 35-year-old females being given the treatment. The treatment is the new allergy drug. (b) Identify a potential problem with the experiment design being used and suggest a way to improve it. Choose the correct answer below. O A. There may be a bias on the part of the patients since they do not know if…A dietician has developed a new diet which is claimed to reduce LDL cholesterol levels for those who use the diet. The dietician wants to test the diet by sampling a random group of 25 people. The dietician will measure the LDL cholesterol levels of each of the 25 people and then measure their cholesterol levels after people in the sample have used the diet for eight weeks. Which of the following tests would be most appropriate for this study? O a. t-test of one sample O b. t-test of two independent samples O c. z-test of two independent samples O d. t-test of paired samples e. Chi-square test of independenceA company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance with blocking (analyze this data as a complete block design) to test further whether there is evidence of a significant difference in mean sales of different package designs. Use alpha = 0.01. What are the mean squares for Treatments? Provide your answer to the nearest 2 decimal places.
- A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance with blocking (analyze this data as a complete block design) to test further whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What are the sums of squares for Blocks? Provide your answer to the nearest 2 decimal places.A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in mean sales of different package designs. Use alpha = 0.01. the p-value associated with the observed test statistic? Please provide your answer to the nearest fou decimal places.A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. What is the conclusion for the null hypothesis that all treatment means are equal? O Do not reject HO. There is sufficient evidence to conclude that the average sales for all stores are not…
- A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 O 0.0642 and 0.0435 2 0.0642 and 0.0038 O 0,0435 and 0.0028 0.0038 and 0.0028 45 0.0028 and 0.0038 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 Enter the above data into a suitable software and then conduct an analysis of variance with blocking (analyze this data as a complete block design) to test further whether there is evidence of a significant difference in mean sales of different package designs. Use alpha=0.01. 49 What are p-values to determine whether all…A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in mean sales of different package designs. Use alpha = 0.01. What are the mean squares for error? Please provide your answer to the nearest two decimal places.A company wishes to evaluate the effect of package design on one of its products, a certain brand of cereal. The four package designs are to be tested in different stores throughout a large city. There are 20 stores available for the study. The amount of cereal sold is known to vary depending on the size of the stores. The 20 stores are divided into five groups of four stores each by size. The following sales figures ($1000s) were obtained after a 1-month period. Stores Design A Design B Design C Design D 1 40 33 37 38 2 45 27 32 40 3 43 31 30 41 4 44 38 40 42 5 56 45 49 42 Enter the above data into a suitable software and then conduct an analysis of variance without blocking to test whether there is evidence of a significant difference in me sales different packa designs. Use alpha = 0.01. What are the sums of squares for treatments? Please provide your answer to the nearest two decimal places.