Which of the following statement is true concerning JDBC?
language independent
It is language independent. It is useful for all object-oriented languages. It consists of three main layers.
Which of the following statements is true concerning OLS estimation?
Which of the following statements is TRUE concerning OLS estimation? OLS minimises the sum of the squares of the horizontal distances from the points to the line. Correct! OLS minimises the sum of the squares of the vertical distances from the points to the line.
Which of the following statement is true concerning subquery?
Which of the following statements is true concerning subqueries?
| 1) | Involves the use of an inner and outer query. |
|---|---|
| 2) | Does not start with the word SELECT. |
| 3) | All of the above. |
| 4) | Cannot return the same result as a query that is not a subquery.Cannot return the same result as a query that is not a subquery. |
| 5) | NULL |
Which of the following statements are true concerning a triangular or recursive system?
Which of the following statements are true concerning a triangular or recursive system? Correct! (i), (ii) and (iii) are all correct. A triangular system is one where the causality between the “endogenous variables” all goes in one direction.
Which of the following are JDBC components?
JDBC Core Components
- DriverManager. The DriverManager class keeps track of the available JDBC drivers and creates database connections for you.
- Driver. The Driver interface is primarily responsible for creating database connections.
- Connection.
- Statement.
- ResultSet.
Which of the following is the benefit of the three tier architecture?
The chief benefit of three-tier architecture is that because each tier runs on its own infrastructure, each tier can be developed simultaneously by a separate development team, and can be updated or scaled as needed without impacting the other tiers.
Why is OLS unbiased?
Unbiasedness is one of the most desirable properties of any estimator. If your estimator is biased, then the average will not equal the true parameter value in the population. The unbiasedness property of OLS in Econometrics is the basic minimum requirement to be satisfied by any estimator.
Where does the Bayes rule can be used?
Where does the bayes rule can be used? Explanation: Bayes rule can be used to answer the probabilistic queries conditioned on one piece of evidence.
Is subqueries true concerning?
Which of the following statements is true concerning subqueries?…Exercise :: Advanced SQL – General Questions.
| A. | Involves the use of an inner and outer query. |
|---|---|
| B. | Cannot return the same result as a query that is not a subquery. |
| C. | Does not start with the word SELECT. |
| D. | All of the above. |
Which of the following is true concerning procedure?
Discussion Forum
| Que. | Which of the following is true concerning a procedure? |
|---|---|
| b. | They do not need to have a unique name. |
| c. | They include procedural and SQL statements. |
| d. | They are the same thing as a function. |
| Answer:They include procedural and SQL statements. |
Which one of the following is examined by looking at a goodness of fit statistic?
Which one of the following is examined by looking at a goodness of fit statistic? How well the population regression function fits the sample regression function. Correct! Goodness of fit statistics show how well the estimated model fits the data – that is – how well the sample regression function fits the data.
Which of the following is correct syntax for viewing data from table?
The syntax is: SELECT column1, column2 FROM table1, table2 WHERE column2=’value’; In the above SQL statement: The SELECT clause specifies one or more columns to be retrieved; to specify multiple columns, use a comma and a space between column names.
What are JDBC 3 components?
JDBC includes four components:
- The JDBC API. The JDBC API gives access of programming data from the Java.
- JDBC Driver Manager. The JDBC DriverManager is the class in JDBC API.
- JDBC Test Suite.
- JDBC-ODBC Bridge.
- Connection.
- Class.forName(String driver)
- DriverManager.
- getConnection(String url, String userName, String password)
What is blob in the following statement?
27) What is blob in the following statement? Explanation: SQL offers BLOB (Binary Large OBject) data type to store image files like . gif or . jpg or jpeg into the database table.
What is 3 tier architecture with example?
Three-tier architecture is a well-established software application architecture that organizes applications into three logical and physical computing tiers: the presentation tier, or user interface; the application tier, where data is processed; and the data tier, where the data associated with the application is …
What is the advantage of 3 tier architecture over 2 tier?
Advantages of 3 tier architecture Offers higher flexibility as far as configuration and platform deployment is concerned. It improves data integrity. It offers higher level of security as client does not have access to the database directly. It is easier to maintain and do any modification.
Is OLS unbiased?
OLS estimators are BLUE (i.e. they are linear, unbiased and have the least variance among the class of all linear and unbiased estimators). So, whenever you are planning to use a linear regression model using OLS, always check for the OLS assumptions.
Is the estimator unbiased?
An estimator of a given parameter is said to be unbiased if its expected value is equal to the true value of the parameter. In other words, an estimator is unbiased if it produces parameter estimates that are on average correct.
What is Bayes Theorem in simple terms?
Bayes’ theorem, named after 18th-century British mathematician Thomas Bayes, is a mathematical formula for determining conditional probability. Bayes’ theorem provides a way to revise existing predictions or theories (update probabilities) given new or additional evidence.
How do you prove Bayes Theorem?
In other words, Bayes’ theorem gives us the conditional probability of B given that A has occurred as long as we know P(A|B), P(A|Bc) and P(B)=1−P(Bc).
