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If the probability is 0.75 that a person will believe a rumor about the transgressions of a certain politician, find the probabilities that
(a) the eighth person to hear the rumor will be the fifth to believe it;
(b) the fifteenth person to hear the rumor will be the tenth to believe it.
A test is given to graduates of tw buisness schools A and B. The scores are given out of 100. Test whether the school differ in quality by using Mann- Whitney U- test with a 10% level of significance.
Compare a Single Sample Mean to a Known or Hypothesized Population Mean
If a random sample of 4 students is selected from the program to be interviewed about the introduction of new fast food outlet on the ground floor of the campus building, what is the probability that all four students selected are undergraduates s..
Construct a 99% confidence interval on the population mean height of all 1-year-old pine seedlings. What are the confidence limits? What statement can be made about the population mean height using the confidence interval?
Create a real-world situation or problem that could be addressed using an independent- or related-samples t test. Create this situation or problem, that clearly identify the independent and dependent variables to study
Assume that the data are normally distributed in the population. Now go back and examine the $1,250 figure published by Runzheimer International. Does it fall into the confidence interval computed from the sample data? What does it tell you?
Test the hypothesis that the average number of days that a home is on the market in City A is different from City B using the following sample data:
hese students obtained a mean score of 470 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, what percentage of scores exceeded 390?
wetland ecologists often recommend including an island in the middle of wetlands to increase the retention time during
we have given the number of successes and the sample size for a simple random sample from a population. in each case do
What is the probability that no HIC country will be included in the sample? What is the probability that "at least one" HIC will be included in the sample? (Note that these two outcomes are complements: "none" and "at least one.")
a. Determine the sample proportion, p, of households with cellular telephones that can be used to access the Internet. b. If the population proportion is 0.40, determine the standard error of the proportion.
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