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Forty subjects are randomly assigned to receive either a new memory pill or a placebo. After treatment, they are all given a difficult recall test. The mean for the memory-pill group is 82%, whereas that for the placebo group is 64%. Can we conclude that the memory pill worked? Explain.
the regression line y -3 2.5 x has been fitted to the data points 28 60 20 50 10 18 and 25 55. the sum of the squared
Let X be a random variable having the binomial distribution Bi(p, n) with an unknown p ? (0, 1) and a known n.
Assume that 20% of students at a university wear contact lenses. We randomly pick 200 students. Would it be unusual to obtain a sample proportion of 22%? Answer by calculating the appropriate z-score. Round to two decimal places when necessary.
a) What is the probability function of the number of granite specimens selected for analysis? b) What is the probability that all specimens of one of the two types of rock are selected for analysis?
You are trying to analyze how much a customer is expected to spend at a local grocery store. Based on historical data, there are 50%, 30%.
The population mean and population standard deviation of the chest circumferences are 39.85 and 2.07, respectively. Identify the normal curve that should be used for the chest circumferences.
a market research firm used a sample of individual to rate the purchase -potential of a particular product before and
Alcohol withdrawal occurs when a person who uses alcohol excessively suddenly stops the alcohol use. Studies have shown that the onset of withdrawal is experienced a mean of 39.5 hours after the last drink, with a standard deviation of 18 hours.
The histogram shows the distribution of the prices of a small, plain pizza (in $) for 156 weeks in Dallas, Texas.- Which summary statistics would you choose to summarize the center and spread in these data? Why?
Which of the conditions fail so that we cannot use a confidence interval for the difference between proportions?
From Group of 40 People, a jury of 12 people is selected. In how many various ways can a jury of 12 people be selected?
Which political party did Tony Blair use to contest for elective office in the United Kingdom?
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