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NEW QUESTION 35
Andy is a pricing analyst for a retailer. Using a hypothesis test, he wants to assess whether people who receive electronic coupons spend more on average.
What should Andy's null hypothesis be?
- A. People who receive electronic coupons do not spend more on average.
- B. People who receive electronic coupons spend more on average.
- C. People who receive electronic coupons spend less on average.
- D. People who do not receive electronic coupons spend more on average.
Answer: A
Explanation:
The null hypothesis presumes the status quo. Andy is testing whether or not people who receive an electronic coupon spend more on average, so, the null hypothesis states that people who receive the coupon do spend more on average.
NEW QUESTION 36
A web developer wants to ensure that malicious users can't type SQL statements when they asked for input, like their username/userid.
Which of the following query optimization techniques would effectively prevent SQL Injection attacks?
- A. Subset of records.
- B. Temporary table in the query set.
- C. Parametrization.
- D. Indexing.
Answer: C
Explanation:
The correct answer is D: Parametrization. Parameterized SQL queries allow you to place parameters in an SQL query instead of a constant value. A parameter takes a value only when the query is executed, allowing the query to be reused with different values and purposes. Parameterized SQL statements are available in some analysis clients, and are also available through the Historian SDK.
For example, you could create the following conditional SQL query, which contains a parameter for the collector's name: SELECT* FROM ExamsDigest WHERE coursename=? ORDER BY tagname SQL Injection is best prevented through the use of parameterized queries.
NEW QUESTION 37
Which one of the following R values shows strongest positive correlation between two variables?
- A. 0.9
- B. 0
- C. 1.6
- D. -0.4
Answer: A
NEW QUESTION 38
You would like to combine the text in two different strings to form a single string.
What action are you performing?
- A. Case conversion.
- B. Trimming.
- C. Parsing.
- D. Concatenation.
Answer: D
Explanation:
Simply defined, concatenation is the act of linking things together. In Microsoft Excel, the concatenation function is one of many text functions, which allows users to combine data distributed over multiple columns.
The concatenation of two or more numbers is the number formed by concatenating their numerals.
For example, the concatenation of 1, 234, and 5678 is 12345678.
NEW QUESTION 39
What type of regulation is the Payment Card Industry Data Security Standard (PCIDSS)?
- A. Administrative law
- B. Civil law
- C. Industry regulation
- D. Criminal law
Answer: C
NEW QUESTION 40
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