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When people smoke, the nicotine they absorb is converted to cotinine, which can be measured through blood tests. A random sample of 40 smokers has a mean cotinine level of 172.5 ng/ml. Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level

what percent of the babies born with each gestation period have a low birth rate (under 5.5 pounds) Explain reasoning(a) Under 28 weeks (b) 32 to 35 weeks(c) 37 to 39 weeks (d) 42 weeks and over

Pat wonders if two-bedroom apartments rent for significantly more than onebedroom apartments. B) State appropriate null and alternative hypotheses. C) Report the test statistic, its degrees of freedom, and the p-value. What do you conclude? D) Can you conclude that every one-bedroom apartment costs less than every two-bedroom apartment? E) Which is more useful to someone planning to rent an apartment, the confidence interval or the significance test? Why?

Helen Holmes makes pottery by hand in her basement. She has 20 hours available each week to make bowls and vases. A bowl requires 3 hours of labor, and a vase requires 2 hours of labor. It requires 2 pounds of special clay to make a bowl and 5 pounds to produce a vase; she is able to acquire 35 pounds of clay per week. She sells her bowls for 50

QUESTION 16 – A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last between 850 and 1250 hours. Assume the variable is normally distributed.