The mean number of drugs brought into production in the last 10 years was 16.5 w

Question

The mean number of drugs brought into production in the last 10 years was 16.5 with a sample standard deviation of 1.2. Is this significantly different from the average 20.2 drugs (with a sample standard deviation of 2) brought into production 10 years before that?

Question 2

Has the percent of people that exercise daily increased? You compare the percent found for 100 randomly chosen people to the known percent for 2012

Question 3

People in the United States spend a lot of money for the purchase of magnets to treat a variety of pains (currently around $5 billion annually). Researchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using a number scale. People were randomly assigned to either the magnet treatment or a placebo treatment. For each person the reduction in the amount of pain during the study was measured. Did magnets reduce back pain for people?

Reduction in back pain for people given magnets      mean=0.49, s=0.96, n=20

Reduction in back pain for people given placebos     mean=0.44, s=1.4,  n=20

What statistical test would be used?

Question 4

U of MD students get an average of 1.7 cups of milk a day with a sample standard deviation of 0.3 Is this significantly less than the US average of 2.3 cups? Data do not meet assumption of normality. What statistical test will you use

Question 5

You have 2 types of hummingbird feeders (Brand A and Brand B) and want to know if which type of feeder chosen is independent of the species of hummingbird (there are 3 that occur in your area, species 1, species 2, and species 3). You put out 100 feeders (50 of each type) in wide spread locations and survey to see which species visits each feeder. What statistical test will you use?

Question 6

A new drug successfully fights infection in 60% of people. Is this significantly different from the 55% for the old drug? What statistical test will you use?

Question 7

You want to know if there is a link between body temperature (degrees C) and respiration rates (number of breaths per minute) and survey 37 people. Assume data meet assumptions of normality.

what statistical test will be used?

Question 8

You believe that there may be an association between whether or not a student reads the newspaper at the University of Maryland and if they are in-state vs. out-of-state students. You collect the following data from 200 randomly selected students. (25 pts)

In-state

Out-of-state

Reads the newpaper

50

42

Doesn’t read the newspaper

65

43

Explanation / Answer

Answer - 1: Since we are testing for a single mean and the population standard deviation is not known, we will use 1 population t test for a mean.

Answer - 2: 1 population z test for a percent

Answer - 3: 2 population t test for 2 means

Answer - 4: 1 population t test for a mean

Answer - 5: Chi Square test of Association

Answer - 6: 1 population z test for a percent

Answer - 7: Regression

Answer - 8: Chi Square test of Association

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