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Twenty-six percent of couples who plan to marry this year are planning destination weddings. In a random sample of 12 couples who plan to marry, find the probability that exactly 6 couples will have a destination wedding.
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
A psychologist has designed a questionnaire to measure individuals' aggressiveness. Assume that the scores on the questionnaire are normally distributed with a standard deviation of 80.
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
Find the distribution of the test statistic when the null hypothesis is true, and then show how to get a test size alpha= 0.10
An investor wants to assess at confidence level of 98% if a medicament can improve the marks of students. He notices that for the following daily dozes: 2,2.5,3,4.5,7 mg, the improvement over the students that studied the same but took no mental b..
Finding the Equation of the Regression Line and Making Predictions. Find the regression equation,
10 people taste wine A and wine B, X= denote the number prefer A. Assume that all others prefer B. These people random sample..
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure that 95% confidence interval estimate for the mean caffeine intake (measured in mg) is within 15 units of the true mean? ..
Each of the given z-scores, draw the normal distribution and sketch the vertical line at location of z-score, then find out whether body is to right or the left of line and determine the proportion in the body.
Determine the likelihood of accepting a lot which is 1% defective?
A poll of U.S. health professionals revealed 82% would choose the same career. In a hypothesis test conducted at a level of significance of 5%, a P-value of 0.023 was obtained.
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