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Is Smiling Independent of Age?
Randomly chosen people were observed for about 10 seconds in several public places, such as malls and restaurants, to see whether they smiled during that time.
The table shows the results for different age groups.
a. Find the percentage of each age group that were observed smiling, and compare these percentages.
b. Treat this as a single random sample of people, and test whether smiling and age group are associated, using a significance level of 0.05. Comment on the results.
Nitrites are often added to meat products as preservatives. In a study of the effect of these chemicals on bacteria
Here are their weights (in ounces) 127,115,116,101,126 assuming that these weights constitute an entire population, find the standard deviation.
How does the shape of the quantile plot affect your interpretation of the results?
What role should the state government take if any? Do you agree with the role the federal government wants to take?
Compute the estimators Gu and for the freestyle times of Table 16.2. Compare with the values of the estimator . Explain the differences, if any.
a basketball team at a university is composed of ten players. the team is made up of players who playthe position of
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
A credit card bank is investigating the incidence of fraudulent card use. The bank suspects that the type of product bought may provide clues to the fraud.
Determine how to minimize the total cost of meeting the demands of the next three quarters. Assume that 1000 usable units are available at the beginning.
Use the data in table 1 to find the MSE and the RMS error for the regression line predicting length from weight. Which statistic gives abetter sense of how far the data are from the regression line? Hint: keep track of the units, or plot the data,..
Suppose interarrival times at a hospital emergency room during a weekday are exponentially distributed, with an average interarrival time of nine minutes.
Explain why the significance of this study is suspect and propose an alternative study that would help clarify the importance of an alarm system.
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