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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.
Compute the Return to Risk Ratio (RRR). On the basis of the results of (A) - (C), which action should the vendor take - sell soft drinks or ice cream? Why?
Solve inequality and graph the solution. Please explain how to how to solve this linear graph
the times in minutes to assemble a computer component for 3 different machines are listed in the table below. workers
Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 69 and 89?
Use normal approximation to the binomial distribution to determine the answer if this probability cannot be determined explain why.
For a normal distribution, find the z-score value that separate the middle 90% of the distribution from the 10% in the tails.
What is the difference between using a hypothesis test to solve a problem and using an Analysis of Variance test (ANOVA) to solve a problem? Give an example of each.
information about a regression analysis includes an intercept of 59.99 and a negative slope of 1.49. make a prediction
Sstandard deviation was found to be 3.3 minutes. Is there evidence to reject the manager's claim at alpha =.02? Perform an appropriate hypothesis test.
Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
Compute the p-value; and at 95% confidence, test the hypothesis. Assume the population is normally distributed. Compute the test statistic.
I never understood the concept of the Empirical Rule and Chebyshev's Rule. Can you explain it to me and provide me with some sample problems please?
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