MATH 130 WEEK 8 PRACTICE 1

MATH 130 WEEK 8 PRACTICE 1 Question 1 of 20 0.0/ 1.0 Points Click to see additional instructions An urban economist is curious if the distribution in where Oregon residents live is different today than it was in 1990. She observes that today there are approximately 3,109 thousand residents in NW Oregon, 902 thousand residents in SW Oregon, 244 thousand in Central Oregon, and 102 thousand in Eastern Oregon. She knows that in 1990 the breakdown was as follows: 72.7% NW Oregon, 20.7% SW Oregon, 4.8% Central Oregon, and 2.8% Eastern Oregon. Can she conclude that the distribution in residence is different today at a 0.05 level of significance? Enter the test statistic - round to 4 decimal places. Test statistic= Answer Key:10.1714 Feedback: NW Oregon SW Oregon Central Oregon Eastern Oregon Observed 3109 902 244 102 Counts Expected 4357*.727 4357*.207= 4357*.048=4357*.028= Counts Test Stat = = 3167.539 901.899 209.136 121.996 Question 2 of 20 1.0/ 1.0 Points A company that develops over-the-counter medicines is working on a new product that is meant to shorten the length of sore throats. To test their product for effectiveness, they take a random sample of 110 people and record how long it took for their symptoms to completely disappear. The results are in the table below. The company knows that on average (without medication) it takes a sore throat 6 days or less to heal 42% of the time, 7-9 days 31% of the time, 10-12 days 16% of the time, and 13 days or more 11% of the time. Can it be concluded at the 0.01 level of significance that the patients who took the medicine healed at a different rate than these percentages? Hypotheses: H0: There is in duration of a sore throat for those that took the medicine.