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Question: Twenty students agreed to participate in a study on colds. Ten were randomly assigned to receive vitamin C, and the remaining 10 received a tablet that looked and tasted like vitamin C but in fact contained only sugar and flavoring. The students did not know whether they were taking vitamin C or not, but the investigators did. The students were followed for 2 months to see who came down with a cold and who didn't. Explain whether each of the following terms applies to this randomized experiment.
a. Placebo.
b. Single-blind.
c. Double-blind.
d. Matched pairs.
e. Repeated measures.
f. Replication.
Card holders should be sampled to meet the original requirements of the sample. Then explain the trade-offs that will occur when you lower the sample to $10,000 to meet their budget.
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
Heights of Presidents. With a height of 67 in., William McKinley was the shortest president of the past century. The presidents of the past century have a mean height of 71.5 in. and a standard deviation of 2.1 in.
Make a histogram of the daily sales since the shop has been in business.- State one fact that is obvious from the scatterplot, but not from the histogram.
Mr. Connors philosophy class has 99 students, classified by academic year and gender, as illustrated in the table below. Mr. Connor randomly chooses one student to collect yesterday's work. What is the probability that he selects a male, given tha..
Suppose that the scores of architects on a particular creativity test are normally distributed.
The reaction times (RT) of seven students were measured for both signals. Decide whether the study is an independent- or paired-samples design, analyze the data, and write a conclusion.
What about a variable I intend to use to help do some forecasting. Interest rates, for example, will have an effect on the number of houses purchased --- may I call interest rate the independent variable and number of houses purchased the dependent v..
Bivariate data for the quantitative variables x and y are given in the attached. These data are plotted in a scatter plot. Sketch an approximation of at the least-squares regression line for the data.
If profit earned in the manufacture and sale of X units of a product is P dollars where: P = 10X - 0.001X2
Suppose that observations X1, X2,..., Xn are made on a process at times 1, 2,..., n. On the basis of this data, we wish to test H0: the Xi 's constitute an independent and identically distributed sequence
the table below summarizes results from a study of people who refused to answer survey questions. a market researcher
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