Author: Anonymous

Given a relation: Student (SID, SName, major, age, city). The data file contains 1000 pages and each page contains 100 tuples. Suppose there is a B+tree index on city and it is unclustered. There are 100 different cities stored in the table and uniform distribution is assumed for the values. The index file contains 20 pages. Given the query: Select * from Student where city=”Rochester”, which of the query plan is more efficient?

A researcher wants to know whether drinking caffeine before a test changes the average number of errors college students make on a proofreading task. The population of students who do not consume caffeine before the task makes a mean of 12 errors. What is the most appropriate null hypothesis?

What measures and quantifies the likelihood of obtaining a specific sample from a specific population?

What p-value is statistically significant?

When must alpha be set to maintain objectivity?

Using the frequency distribution table, what is the probability of selecting a score of 2 or 4? Score (X) Frequency (f) Proportion (p) Probability p(X) 1 1 .25 .25 2 1 .25 .25 3 1 .25 .25 4 1 .25 .25

A patient receiving IV fluids is complaining of pain and swelling at the infusion site. What should the nurse do first? A) Apply a warm compress to the siteB) Stop the infusion and assess the siteC) Change the IV tubingD) Notify the healthcare provider

A nurse is assessing a patient with a suspected pulmonary embolism. Which sign or symptom would be most indicative of this condition? A) Productive cough with green sputumB) Sudden onset of shortness of breathC) Pitting edema in the lower extremitiesD) Elevated blood pressure

Antibodies come from B-Lymphocytes that have changed into plasma cells.

_____________  are land plants without xylem.