Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher as
You are collecting data, asking participants about their religious background. Choices include: Christian, Jewish, Muslim, Buddhist, Hindu, Atheist, Agnostic, Pagan, and Other. Which measures of central tendency would be best for this particular d
What is the confidence interval for the population mean is there anything about this data set suggesting that the confidence interval might not be very good?
Under a recent U.S. Food and Drug Administration (FDA) standard for food contaminants, 3.5 ounces of tomato sauce can have up to 30 fly eggs, and 11 ounces of wheat flour can contain 450 insect fragments.
If a manager believes that the required sample size is too large for a situation in which she desires to estimate the mean income of blue collar workers in a state, which of the following would lead to a reduction in sample size?
Use normal approximation to estimate the probability of getting exactly 47 girls in 100 births. Assume that boys and girls are equally likely.
The amount of coffee dispensed in a paper cup of a vending machine is normally distributed with a mean of 4.5 oz. and standard deviation of 0.2 oz. What percent of all the paper cups will have more than 4.8 oz of coffee?
Although the rules of probability are just basic facts about percents or proportions, we need to be able to use the language of events and their probabilities. Choose an American adult at random. Define two events: A = the person chosen is obese B
A student has computed that it takes an average (mean) of 16 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to an early class. One day it took the student 21 minutes to get to class. How many standard dev
Consider a small self-service car wash that has cars arriving with exponentially distributed inter arrival times at a mean rate of 15 per hour. The car wash has 3 washing bays, each equipped with a pressure spraying hose that the customer uses to
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