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Diabetes tends to be more prevalent in urban populations, but why this is so is not fully understood. A recent study1 on mice was designed to investigate the link between diabetes and air pollution. The study involved 28 mice, with 14 randomly selected to have filtered air pumped into their cage while the other 14 breathed particulate matter that simulated common air pollution. The response variable is the amount of insulin resistance each mouse had after 24 weeks. Higher insulin resistance indicates a greater risk for developing diabetes.
a) Is this an observational study or experiment study
b) If we are interested in whether there is a difference in mean insulin resistance between the two groups, what are the null and alternative hypotheses?
c) What is the p-value
The flotation cost on new debt is 4%. What is the initial cost of the plant if the company raises all equity externally?
A researcher conductued a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he ..
what do you conclude about the claim below? do not use formal procedures or exact calculations. use only the rare event
Suppose a professor said that the population mean should be 10 centimeters. Test the hypothesis that the population mean is not 10 cm.
Is it necessary to know anything about the shape of the distribution of the account balances in order to make an interval estimate of the mean of all the account balances?
Problem: Derive the distribution of the sample mean ???X?¯???? of independent X1, . . . , Xn where, Xi ~ G(a, ß).
El Niño and the monsoon It appears that El Niño, the periodic warming of the Pacific Ocean west of South America, affects the monsoon rains that are essential.
NASA is planning many Mars missions with rover vehicles. A typical rover is a solar-powered vehicle which will see where it is going with TV cameras and will measure distance to objects with laser range finders.
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
How do you calculate the probabilities of a Range Note Option? Once you have these probabilities, how do you calculate the value of the Range Note?
You test him, and he gets 20 right out of 20. Do you think he can predict the coin flip (or has a way of cheating)?
Mean or median? You are planning a party and want to know how many cans of soda to buy. A genie offers to tell you either the mean number of cans guests.
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