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A researcher conducts a study of white and black attitudes toward the police in her community.
The percentage of white respondents (N = 300) who say they have a favorable attitude toward the police is 55% with a 95% confidence interval of +/- 5.6%. The percentage of black respondents (N = 250) who say they have a favorable attitude toward the police is 41% +/- 6.1%.
You are asked if there is a real difference between the percentage of whites and blacks who have a positive attitude toward the police in the larger population, or is this sample difference likely to have occurred by random chance or sampling error.
How do you respond? Explain your answer.
Assume the gasoline mileage of this mileage is approximately normally distributed with a standard deviation of 3.2 miles per gallon. What proportion of 2005 Honda Insights with automatic transmission gets over 60 mpg on the highway?
A population is normally distributed with mean 42.7 and standard deviation 4.7. Find the following probability.
you randomly select and measure the contents of 10 bottles of cough syrup. the results in fluid are shown. assume the
A student heard that the average household watches 26.4 hours of t.v. per week, with a stand.dev. of 2.3 hours. He decided to run his own experiment and found that the average for the 58 people he surveyed was 27 hours. a) state H0 and H1 b) calculat..
Value of s^2 (s(squared)), is less than or equal to 0.01 even though s = 0.0075. What is to be done with a shipment of this glass for which the sample variance of the indices of refraction equaled 0.000182?
Finding the probability selecting a defective item from a collection of items using tree diagram
mileage tests were conducted on a randomly sample of 100 new tires. the avg. tread wear was 50000 miles with standard
what is the probablity that a person selected at random from this hwas data set is horter than 65 or taller than
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Construct a stem-and-leaf diagram for the data:
Which statement is true for a statistical study?
a psychological test used to measure the level of hostility is known to produce scores which are normally distributed
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