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A qualitative predictor representing a university’s college is included in a regression model. The levels for this predictor variable are Engineering Liberal Arts and Sciences Medicine Business Communications How many binary/indicator predictor variables are necessary to create this categorical variable in the regression model? Enter a positive integer.

Which of the following always increases or stays the same when adding more predictors (even if not significant) to a model? (i.e. p is increasing). Select all that apply.

Consider the following violin plot for the chickwts dataset. Which feed group below has the smallest average weight? 

We measure the change in blood pressure of some hypertension patients after taking a new medicine. We conduct a hypothesis testing with null hypothesis being that the medicine cannot reduce blood pressure. We get the p-value from the test. Which statement is true? 

 Which of the following scenarios is most appropriate for using a paired t-test (instead of an unpaired t-test)?

In your own words explain how antibiotic resistance bacteria are formed?

100 individuals have received a test for covid-19 virus. Here are the results: 15 have the virus and test positive. 5 have the virus and test negative. 78 don’t have the virus and test negative. 2 don’t have the virus and test positive.  The true positive rate of the test in this sample is 

What is the action of all of the negative feedback mechanisms of the body?

What is the function of the serous membranes?