Complete on paper, detail your process In 2012 Kelly Blue Bo…

Complete on paper, detail your process In 2012 Kelly Blue Book claimed that the average length of car ownership had increased to 57 months. Gwen questions whether this is really true.  She studies 1000 cars in her city and finds that the average length of ownership is 58 months with standard deviation 10. Is that significantly different (with

In a study of the impact of smoking on birth weight, researc…

In a study of the impact of smoking on birth weight, researchers analyze birth weights (in grams) for babies born to 189 women who gave birth in 1989 at a hospital in Massachusetts. In the group, 74 of the women were categorized as “smokers” and 115 as “non-smokers.” The difference in the two sample mean birth weights (non-smokers minus smokers) is 281.7 grams and the 95% confidence interval is (76.5, 486.9) Which gives the best interpretation of what we can conclude about the impact of smoking on birth weight?

You measure 40 turtles’ weights, and find they have a mean w…

You measure 40 turtles’ weights, and find they have a mean weight of 33 ounces and standard deviation 5.7 ounces. Based on this, you construct a 99% confidence interval for the true population mean turtle weight to be 30.68 < μ < 35.32. Do these results show that the mean turtle weight has significantly changed from the previously determined weight of 29 ounces?

Did you attempt this problem on your paper?   Sebastian is r…

Did you attempt this problem on your paper?   Sebastian is rolling an unfair six-sided die where the probability of rolling a 3 is 24%.  Suppose he rolls this die 15 times and keeps count of the number of 3s that are rolled. a) What is the probability that at the end of the 15 rolls, Sebastian has rolled 3 six times exactly? b)  What is the probability that at the end of the 15 rolls, five or fewer 3s are rolled? c)  What is the probability that at the end of the 15 rolls, Sebastian has rolled at least ten 3s?

A July 2011 Pew Research survey suggests that 27% of adults…

A July 2011 Pew Research survey suggests that 27% of adults say they regularly get news through Facebook, Twitter or other social networking sites. What’s the probability that in a random sample of 10 people at most 1 of them get their news through social networking sites?