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Assuming the population proportion is .75, how many standard deviations above or below the mean does the Harris poll sample fall?
find the probability that the average of those counts is more than 81.4 mosquitos per square meter. Assume that the variable is normally distributed.
Test at a 95% confidence interval. What is the Hypotheses and inidicate what is the sample proportion. What is the P-value and, in turn, what is your conclusion? Accept Reject?
What are the mean and standard deviation for the number of people who believe that America is ready for a woman president for a sample of size 1000?
) What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
Suppose that pH measurements of rainfall on different days in a Canadian forest follow a Normal distribution with standard deviation σ = 0.5. A sample of n days finds that the mean pH is x =
What method of data collection would you use to collect data for a study where a drug was given to 10 patients and a placebo to another group of 10 patients to determine if the drug has an effect on
you select a sample of 30 scores from a population of 1000 scores you compute the mode, median and the mean on the sample of 30 scores. you then select another sample of 30 scores from the same popu
Determine a 95 percent confidence interval for the population mean.
The weight of adult Golden Retrievers is normally distributed with a mean of 65 lb and a standard deviation of 3 lb. A random sample of 15 Golden Retrievers has an average weight of 66 lb. what is t
Now suppose 3 of his customers want the same ring, and they will go to another store if its already been sold. Would it be appropriate to use the binomial distribution under these conditions? Why or
A delivery truck must make stops in 4 different cities, designated by the first letter in the name of the city: A, B, C, D. If the order in which the truck visits the eight locations is chosen rand
The Nelson Company makes the machines that automatically dispense soft drinks into cups. What is the probability that a new cup will overflow when filled by the automatic dispenser?
A recent study indicated that 29% of the 100 women over age 55 in the study were widows. a. How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true pr
Based on this sample, what is your initial hunch? Would you claim with 95% confidence that the mayor will win a majority of the votes? Explain.
A researcher wants to gauge public opinion on gun control. He randomly selects 1000 people and asks: "Do you believe that gun control laws which restrict the ability of Americans to protect their fa
If the expectation of a sampling distribution is located at the parameter it is estimating, then we call that sampling distribution:
how much do you have to reduce your average production time so that 95% of the time you can deliver the product in under 75 hours?
What is the average monthly amount charge? What percent of monthly charges are between $600 and $ $889 What percent of monthly charges is less than $100
Using the Cumba database file, develop a model to predict employee salary using employee age. Interpret the meaning of the slopes in the equation.
Suppose you select a student and observe his or her major. a. What is the probability he or she is a management major?
For a particular group of individuals, 20% of their income tax returns are audited. Of five randomly chosen individuals, what is the probability that none will have their returns audited?
Southwest airlines is studing the weight of luggage for each passenger for a arge group of domestic passangers, the mean is 47 pounds with a standard deviation of 10 pounds. for a large group of ove
Find the maximum total allowable weight if you want a 0.975 probability that this maximum will not be exceeded when 16 males are randomly selected.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes from the figure. Label each class with its endpoints.