As cats age, they can suffer a decline in cognitive functioning. Memory, the ability to learn, awareness, sight, and hearing can all deteriorate. A study is to be conducted to determine which of two medicines, Anipryl or a monoamine oxidase inhibitor, is more effective in promoting cognitive health and reducing the onset of feline cognitive dysfunction. Researchers will randomly select 150 cats from 10 different large veterinary practices around the country. All the cats will be more than 10 years old, and their owners have given consent to participate in the study. Changes in cognitive health will be evaluated after six months of treatment. Part A: What would be an advantage of adding a control group to the design of the study? (2 points) Part B: Assuming a control group is added, explain how you would assign the 150 cats to the three treatment groups for a completely randomized design. (4 points) Part C: Rather than using a completely randomized design, one group of researchers proposes blocking on veterinary clinics whereas another group of researchers wants to block on breed of cat. How would you decide which one of these two variables to use as a blocking variable? (4 points) (10 points)

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

In a sample of 2023 u. s. adults, 373 said franklin roosevelt was the best president since world war ii. two u. s. adults are selected at random from the population of all u. s. adults without replacement. assuming the sample is representative of all u. s. adults, complete parts (a) through (d). (a) find the probability that both adults say franklin roosevelt was the best president since world war ii. the probability that both adults say franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (b) find the probability that neither adult says franklin roosevelt was the best president since world war ii. the probability that neither adult says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (c) find the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii. the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (d) which of the events can be considered unusual? explain. select all that apply. the event in part left parenthesis a right parenthesis is unusual because its probability is less than or equal to 0.05. the event in part (b) is unusual because its probability is less than or equal to 0.05. none of these events are unusual. the event in part (c) is unusual because its probability is less than or equal to 0.05.

Question 13 (1 point) jerome is starting a new job. his contract states he will earn $42,000 the first year, and will get a 4% raise per year. which function s(x) represents jerome's salary after a certain number of years, x?