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The federal government recently granted funds for a special program designed to reduce crime in high-crime areas. A study of the results of the program in eight high-crime areas of Miami, Florida, yielded the following results.
Number of Crimes by Area
A B C D E F G H
Before 14 7 4 5 17 12 8 9
After 2 7 3 6 8 13 3 5
Has there been a decrease in the number of crimes since the inauguration of the program?
Use the .01 significance level. Estimate the p-value.
1. State Null and alternate hypothesis
2. Select a level of significance
3. Identify the test statistic
4. Formulate a decision rule
5. Take a sample arrive at a decision
If random samples, each with n = 4 scores, are selected from a normal population with MK = 80 and o=10
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
Find the percentage of buyers who said their price range is between $150,000 and $153,300.
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
When the purpose of sampling is to detect when a process becomes too variable the chart of choice will be a c-chart?
At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
The nation health department has concerns with the chlorine level of 0.4% mg/mL at a local water park raises to unsafe level.
The odds of the Dallas Cowboys winning this year's Super Bowl are 3 to 1. Compute the probability of the Cowboys winning
Conduct a test to determine whether blood lactate level (y) is linearly related to perceived recovery (x). Use alpha = .05. Find the p-value for testing the hypotheses you gave in the previous problem. Show all decimal places in your answer.
A political action committee decided to poll its membership to determine if they were in favor of a certain potential law, similar to gun control.
Find the mean ______________ and the standard deviation _____________
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
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