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Suppose that we had data on per capita GNP9measured in US dollars) for a sample of developing countries, and that these data were normally distributed with a mean of $ 1750 and a standard deviation of 300. What's the probability that a randomly selected state has a per capita GNP at or below $950?
Perform a proper analysis. Describe your null and alternative hypothesis, report the p-value. What is your conclusion?
LSAT scores are normally distributed, with a mean of 150 and s = 10.
Determine the probability that the sample mean is 20 or higher? What is the probability that the sample mean falls within 2 points of the population mean?
Experience ranges from 0 to 3. University ranking ranges from 1 to 4 (with 1 being the highest rank), and the Wonderlic test ranges from 0 to 50.
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female Hispanic drivers in Boston; 68 of these drivers were wearin..
A fair coin is continually flipped until heads appears for the tenth time. Let X denote the number of tails that occur. Compute the probability mass function of X.
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
You are using a significance level of α = 0.05 to test a claim that p > 0.5. Your sample is a simple random sample of size n = 49. Calculate β for the test, assuming that the true population proportion is 0.7 and showing all work.
Decileter and standard deviation of 41 mg/dl. in an srs of 100 men what is the probability that x bar takes a value between 185 and 191 mg/dl?
The Internal Revenue Service plans to examine an SRS of individual federal income tax returns from each state. One variable of interest is the proportion of returns claiming itemized deductions.
The weight of a small Starbucks coffee is a random variable with a mean of 360 g and a standard deviation of 9 g. Use Excel to find the weight corresponding to each percentile of weight.
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