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1) The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample off 117 female Hispanic drivers in Boston; 68 of these drivers were wearing seatbelts. Give a 95% interval for the proportion of all female Hispanic drivers in Boston who wear seat belts.
2) Does the above data give good reason to conclude that more than half of Hispanic female drivers in Boston wear seat belts?
3) PTC is a substance that has a strong bitter taste for some people and is tasteless for others. The ability to taste PTC is inherited. About 75% of Italians can taste PTC, for example. You want to estimate the proportion of Americans with at least one Italian grandparent who can taste PTC. Starting with the 75% estimate for Italians, how large a sample must you collect in order to estimate the proportion of PTC tasters within ± 0.04 with 90% confidence?
4) Are you getting more spam in your personal email account? Suppose that 40% of adult email users would say "Yes." A polling firm contacts an SRS of 1500 people chosen from this population. If the sample were repeated many times, what would be the range of sample proportions who say "Yes," according to the 99.7 part of the 68-95-99.7 rule.
For the samples summarized below, test the hypothesis that the two variances are equal, at α = 0.05
There is a statistical deception here. Explain what is deceptive about the bar graph.
Real estate agents always say "location, location, location" is the most important thing in buying a house. We want to know if the sales prices of homes in two neighborhoods are similar. A random sample is taken from each neighborhood. The prices ..
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
How should the candidate purchase the five commercials to maximize the estimated number of additional voters?
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
The mean of a normal distribution probability is 400 pounds. The standard deviation is 10. What is the area between 415 pounds and the mean of 400 pounds? (Round to 4 decimals)
1) We are 99% confident that the proportion of patients surveyed that have experienced a reduction in symptoms is between 0.2112 and 0.6638. 2) We are certain that 99% of patients will be between 0.2112 and 0.6638. 3) We cannot determine the proper..
Identify the indicated values or interpret the given display. In a survey of 703 randomly selected workers,
Deriving the regression equation, testing the model fit and obtains confidence interval for estimated values.
Market researchers use it by correlating product attribute ratings with a dependent measure such as overall satisfaction. They then rank the product attributes to determine which attributes are the most important. They call this Key Driver Analysi..
Findout the variance also standard deviation for the 2 distributions above. Evalute the variation of the data sets.
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