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The newspaper has charged that your police department responds more slowly to 911 calls in poor neighborhoods than in more wealthy ones. As Captain, you gather the following data [n = 191] to determine whether the allegation is true. Specify the null and alternative hypothesis.
Police Response TimeNeighborhood Less than 3 minutes 3 to 7 minutes Over 7 minutessocio-economicstatus
Low 11 17 35Medium 16 24 13High 48 20 7Total 75 61 55
What do you conclude? [use alpha of 1%]
Compare your best difference to the result from an ordinary two-sample t-test between these groups. Comment the difference.
what is the probability of obtaining at least 6 cases in this class if the nationwide rate holds True?
A survey showed that 24% of college students read newspapers on a regular basis and that 81% of college students regularly watch the news on TV. The survey also showed that 21% of college students both follow TV news regularly and read newspapers ..
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Support colour-coding on packaged food to indicate healthier options
In this table, my research is about the average amount of money people expect to spend on attomeys when they are injured. Is there a difference, depending on type of injury? Do people expect to spend more when the injury happened in a car, on job,..
Graph the p.d.f and show that the probability of the part failing in the first 200 weeks is 1/8
Do any of the selected samples seem to be out of the control limits? Describe.
What are the possible combinations of coins that Sanjay could have received in change?
The weight of an almond is normally distributed with mean 0.05 ounce and standard deviation of 0.015 ounce. Find the probability that a package of 100 almonds will weigh between 4.3 and 5.3 ounces.
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
Accident records given by an insurance company give the following information. The probability that an insured driver has an accident is 0.15. If an accident occurs, the damage to the vehicle amount to 20% of its market value 80% of the time
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