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One slot machine pays off 1/2 of the time, while the other pays off 1/4 of the time. We pick one of the machines and play it 6 times, winning 3 times. What is the probability we are playing the machine that pays off only 1/4 of the time?
True mean chloride level of all healthy Washington residents. What is the lower limit of the 90% confidence interval? what is the upper limit of the 90% confidence interval?
List the five-number summaries of the number of days between the receipt of a complaint and the resolution of the complaint and construct boxplot and describe the shape of the distribution of the data.
Differentiate between descriptive statistics and inferential statistics. Provide an example for each. How does correlation analysis differ from regression analysis? What does a correlation coefficient reveal? Is correlation the same as causation?
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
A quality control engineer wanted to estimate the mean weight (in grams) of M&M candies being produced on a certain machine in the factory. After collecting an appropriate random sample of M&M candies, he obtained the following weights:
1. do this exercise by hand. a famous brand-name manufacturer wants to know whether people prefer nibbles or wribbles.
37 percent of managers have MBA degrees. Using probability formulas. Determine the proportion of employees who are managers and have MBA degrees.
the following data lists the average monthly snowfall for january in 15 cities around the us20 13 15 28 16 25 2 1435 42
Ccarry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
two of bags salt and five bags of mahangu cost n41. three bags of salt and ten bags of mahangu cost n 74. formulate two
The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is taken. The average age in the sample was 22.5 years with a standard deviation of 5 years.
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