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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.
1. Construct a 95% confidence level.
2. Now do the same thing with 80% confidence level.
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
Find the 95% confidence interval for the true population mean. Identify the point estimate for mean and margin of error.
The weights of the contents of cereal boxes are normally distributed, with a mean weight of 12 ounces and a standard deviation of 0.05 ounce. The weights of four cereal boxes selected at random are 12.01 ounces, 11.92 ounces, 12.12 ounces, and 11...
What is the value of the slope of the least squares regression line for these data? Round your answer to at least four decimal places.
Create a 99 percent confidence interval for difference in means between Line B and Line C.
Based on these data, what is the probability that next Christmas will be dry and based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
Explain how much should the airport authority be willing to pay for perfect information about the success of a brand new airport.
What is the difference between McNemar's Test and the chi-square test for 2X2 tables? When do we use each test?What is a discordant pair and concordant pair? Also, which type of pair is used in the McNemar's test?
Using one mean Z test to test whether or not to support the claim - Is there evidence that the average hours is below 6? Describe.
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
The probability of success for any trial of a binomial experiment is 25%. Find the probability that the proportion of successes in a sample of 500 is less that 22%. Repeat with a sample of 800. Repeat with a sample of 1,000.
Find the critical value Zc necessary to form a confidence interval at the given level of confidence.
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