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A random sample of 35 observations was selected from a normally distributed population. the sample mean was x-bar=51, and the sample variance was s^2=16.0. does the sample show sufficient reason to conclude that the population standard deviation is not equal to 3 at the 0.05 level of significance? use the p-value method.
A normal distribution was used as the prior for the mean, and it was found that posterior mean was 15 and the posterior standard deviation was 0.1 what were the mean and standard deviation of the prior.
Construct a 99% confidence interval estimate of the population proportion of accounts that would purchase the additional line if the handset were free.
A restaurant claims that its speed of service time is less than 18 minutes. A random selection of 36 service times was collected, and their mean was calculated to be 17.7 minutes.
Twenty defective products are found after a long working day. What is the probability that all the defective products can be reworked?
Alternative C would have fixed costs of $100,000 and variable costs of $15 per unit. Revenue is expected to be $50 per unit. Which alternative has the lowest break-even quantity?
A simple random sample of 400 trees is selected, and the sample mean age of these trees is computed. We know the random variable has an approximately normal distribution because of?
Leggo's pesto is make from a recipe brought to America by an immigrant ancestor the present generation refers to as Bisnonna Maria.
Phil has seen his shadow 104 times. (a) What is the probability that Phil will see his shadow on a randomly chosen Groundhog Day? (b) What kind of probability is this?
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
Servings of water is approximately normally distributed with a standard deviation of 1.4 serving, what proportion of americans drink a. more than the recommended 8 servings.
A major hurricane is a hurricane with wind speeds of 111 miles per hour or greater. During the 20th century, the mean number of major hurricanes to strike the U.S. mainland per year was about 0.7.
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