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If 500 people are randomly selected from the American population, what is the probability of obtaining a sample proportion of 9% or less?
Assuming that the uninsured rate is the same today as it was in 2002, determine the probability distribution for the number, X, who have no health insurance coverage.
What is the probability of obtaining a sample average this low if the process is set up as described above? Take your answer to three decimal places. [Hint: This is a sampling distribution problem.
Give the lower bound of the 95% confidence interval for the true proportion of all CEOs who have MBAs. Take all calculations to three decimal places.
The true highway mileage, Y, of a specific brand of hybrid vehicle has a normal distribution with a mean of 42 and a standard deviation of 1.5. Find the probability that a randomly selected hybrid v
What would the standard deviation of the sampling distribution of the sample proportion be in this case?
Find the probability that the sample mean would be less than 40, to three decimal places. [Hint: Use the correct z-score calculation.
One manufacturer of aspirin claims that the proportion of headache sufferers who experience relief by taking only two pills is 0.53. If this claim is true,
A recent survey asked American adults how often they volunteered for charity. In the sample of 1,974 people, 51 said "more than once per week.
A biased coin is flipped twice. There is a (5/9) probability that it will land heads on at least one of the two flips. What is the smalles number of times that I can flip the coin if I want to be at
A certain distribution X and Distribution Y have the same mean. Both distributions are symmetrical, but Distribution X is more variable than distribution Y. Given this information, we can correctly
A certain type of IQ score has a mean of 106 and a standard deviation of 10. What would the mean of the sampling distribution of the sample mean if samples of size 89 were taken? Round your answer t
An insurance company believes that their policyholders fall into two demographic profiles, A and B. The fraction of policyholders that are of demographic A is ? (with 0 < ? < 1) and the fracti
Suppose you open a new game at the county fair. When patrons win, you pay them $3.00; when patrons lose, they pay you $1.00. If the probability of a patron winning is p = .20, then how much can you
A researcher determines that the probability of missing class among students at a local school is p = .16. Assuming that the school has 300 students enrolled, how many students can we expect to miss
In a random sample of five microwave ovens, the mean repair was $80.00 and the standard deviation was $11.50. Assume the variable is normally distributed and use a t-distribution to construct a 99%
In 1894,druggist Asa Candler began distributing handwritten tickets to his customers for free glasses of Coca-Cola at his soda fountain. By 1975 it was estimated that 65% of U.S. Consumers regularly
Compute the Pearson correlation for the following set of scores:
If the variance for the difference scores is reduced to s2 = 64, are the results sufficient to conclude that there is significant improvement? Use a one-tailed test with a = .05.
A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of u and to construct the 90% confidence interval for mue.
The following data are from an independent-measures experiment comparing two treatment conditions. Do these data indicate a significant difference between the treatments at the .05 level of signific
Do the sample data support the conclusion that the Memory Booster has a significant effect? Test with a = .05. Compute Cohen's d to measure the size of the treatment effect.
For the chi-square test for goodness of fit, what is the value of df for a test with four categories and a sample of n = 100?
A repeated-measures study finds a mean difference of MD = 5 points between two treatment conditions. Which of the following sample characteristics is most likely to produce a significant t statistic
A sample of n = 25 individuals is selected from a population with fx = 80 and a treatment is administered to the sample. If the treatment has no effect, then