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Question: Public concern has recently focused on the fact that although people in the United States often try to lose weight, statistics show that the general population has gained weight, on average, during the last 10 years. A researcher hired by a weightloss organization is interested in determining whether three kinds of artificial sweetener currently on the market are approximately equally effective in reducing weight. As part of a study, a random sample of 300 people is chosen. Each person is given one of the three sweeteners to use for a week, and the number of pounds lost is recorded. To reduce experimental errors, the people in the sample are divided into 100 groups of three persons each. The three people in every group all weigh about the same at the beginning of the test week and are of the same sex and approximately the same age. The results are SSBL = 2,312, SSTR =3,233, and SSE =12,386. Are all three sweeteners equally effective in reducing weight? How confident are you of your conclusion? Discuss the merits of blocking in this case as compared with the completely randomized design.
For the data given below, regress one variable on the other. Is there an implication of causality, or are both variables affected by a third?
a standard deck of cards contains 52 cards. one card is selected from the deck.a compute the probability of randomly
Create a 90% confidence interval for true mean amount of cholesterol in chicken eggs.
The times are shown here. At the 0.05 level, do the seat designs differ significantly in terms of the time that patrons stay? Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test?
Let A be the event that the number of heads is even. Does there exist an event B ? S3 such that A and B are independent?
Let X1 ,X2 be a random sample of size 2 from a distribution with positive variance and m.g.f. M( t). If Y = X1 + Xi and Z X1 ·- X2 are independent, prove that the distribution from which the sample i..
Find the probability that a value randomly selected from this population will have a value between 90 and 130.
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
a student creates a simulation that flips a coin 200 times in a row randomly generates 0s and 1s recording whether or
In a particular exercise, Juan de Alonso assigns him three take-offs and landings on the aircraft carrier to which he is assigned. Under the assumption that the events resulting from each landing attempt are statistically independent of each other..
An engine system consists of three main components in a series, all having the same reliability.
a contractor wishes to build 9 houses each different in design. in how many ways can he place these houses on a street
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