Statistics question? can anybody help me!

Posted on 2014-12-05 06:11:00 in Statistics by KERRY

1. A database of domestic violence statistics provides means and standard deviations for domestic crimes for each of the major cities in the US. The city of New York and the city of Chicago want to compare their domestic crime rates after each city has instituted a wide-scale publicity campaign aimed at educating the citizens about domestic crime. The mayor of New York believes that her city has benefited more from the campaign. The mean number of domestic crimes committed each week over a specific period in each city are the data. What test would you choose to answer the question?

2. An automobile manufacturer measures the mean braking distance for each of 40 new automobiles both before and after they have been installed with a special brake pad. He would like to know if the special brake pad makes a difference in mean braking distance. What test would you choose to answer the question?

3. An automobile manufacturer measures the mean braking distance for 40 new automobiles that have been installed with a special brake pad. He uses as his control group, 40 automobiles that have not been installed with the special brake pad. He would like to know if the special brake pad makes a difference in mean braking distance. What test would you choose to answer the question?

4. A physiotherapist measures quadriceps muscle mass in each of her 25 post-surgical knee ligament patients. Six months after they have begun physiotherapy, she measures muscle mass again. She wishes to know if the therapy increased mean muscle mass. What parametric test would you choose to answer the question?

5. A student in agriculture is trying to improve the hardiness of Alpine grasses by cross-pollinating different strains. He plants each of his three types of new grass seed in an Alpine area. He measures mean number of germinating seeds for each of the three kinds to see if they differ. What test would you choose to answer the question?

6. A physiotherapist measures quadriceps muscle mass in each of her 40 post-surgical knee ligament patients. She randomly assigns half of these patients to a new physiotherapy program and the other half to the traditional therapy program. Six months after they have begun physiotherapy, she measures muscle mass again. She wishes to know if the two therapy programs had different effects on mean muscle mass increase. What parametric test would you choose to answer the question?

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