Question

In: Computer Science

Indicate if the following statements are true or false. For false statements, explain why the statement...

Indicate if the following statements are true or false. For false statements, explain why the statement is false or give the correct answer.(1 point each)

6. A simple attribute can be broken down into smaller components.

7. The relationship between a weak and strong entity is called a multiple relationship.

8. An identifier is a combination of two or more attributes from two tables.

9. A unary relationship must have mandatory many cardinality on both sides.

10. If two entities are related many to many, we take the primary key of each entity and make it a foreign key in the other.

11. Compare and contrast overlap rule and disjoint rule. Compare and contrast total and partial specialization. (2.5+2.5=5 points total)

Expert Solution

Q6:false

It is false because the Composite attribute can be broken down in to simpler components.simple attributes can't be divided.

Q7:false

False because the relation between the strong entity and weak entity is called identifying relationship

Q8:false

False because identifier is the name of objects,it is the name given by database designer or system users to data base objects such as tables, views etc

Q9:false

The Unary relationship is when both participants in relationship are same. So not mandatory and not have many cardinality

Q10:True

The primary keys in each entities and make foreign in key in many to many.

Q11:a)disjoint rules states that an entity instance of an super type can only be a member of one sub type. The overlap rules states an entity instance of a supertype can be a member of multiple subtypes

Disjoint events are events that don't have any outcomes in common. and overlap have outcome in common.

B) total specialization rule demands that every entity in the super class. Symbolized with a double line

Partial specialization exist when every instance of a super type does not have to be an instance of a subtype

venereology answered 1 year ago

Indicate whether the following statements are true or false. Why or why not? Explain your answer...

Indicate whether the following statements are true or false. Why or why not? Explain your answer clearly and concisely. a. [5 points] The fact that health and income are positively correlated suggests that a policy of transferring income from the wealthy to the poor will increase overall health in society. b. [5 points] The concept of need in health care derives from the presence of externalities in healthcare markets.

True/False: Indicate whether the following statement is true or false. If it is false, indicate the...

True/False: Indicate whether the following statement is true or false. If it is false, indicate the reason. If it is true, indicate what makes it true. Just stating true or false will not earn any points. "It is not possible to have concave preferences."

Indicate whether each of the following statements is true or false, and explain why. A competitive...

Indicate whether each of the following statements is true or false, and explain why. A competitive firm that is incurring a loss should immediately cease operations. A pure monopoly does not have to worry about suffering losses because it has the power to set its prices at any level it desires. In the long run, firms operating in perfect competition and monopolistic competition will tend to earn normal profits. Assuming a linear demand curve, a firm that wants to maximize...

Indicate whether the following statements are true, false, oruncertain. Explain why. (a) As income is...

Indicate whether the following statements are true, false, or uncertain. Explain why. (a) As income is eventually spent on consumption, income and consumption taxes are equivalent. (b) If we use wage rate as basis of taxation, it satisÖes horizontal equity. (c) By increasing corporation income tax rate, we can reduce income inequality. (d) We can eradicate the underground economy by imposing heavy tax. (e) Progressive income tax scheme is necessarily involved with increasing marginal tax rate. (f) If we collect...

Indicate whether the following statements are true, false, or uncertain. Explain why. (a) As income is...

Indicate whether the following statements are true, false, or uncertain. Explain why. (a) As income is eventually spent on consumption, income and consumption taxes are equiv- alent. (b) If we use wage rate as basis of taxation, it satisÖes horizontal equity. (c) By increasing corporation income tax rate, we can reduce income inequality. (d) We can eradicate the underground economy by imposing heavy tax. (e) Progressive income tax scheme is necessarily involved with increasing marginal tax rate. (f) If we...

* Indicate if statement is true (T) or false (F), and explain why? * (a) A...

*** Indicate if statement is true (T) or false (F), and explain why? *** (a) A 95% prediction interval for a future observation at x0 is wider than the 95% confidence interval for the mean response at x0. (b) For a simple linear regression model y = β0 + β1x + ε, and using a 95% confidence interval for the slope β1 (-0.0416, 0.8145), we can conclude in a 0.1 significance level that x and y are not significantly linearly...

True or False. Indicate whether the statement is true or false. If false, explain in the...

True or False. Indicate whether the statement is true or false. If false, explain in the space provided the statement why it is false, or simply correct the statement. Smooth muscle contraction is regulated by the autonomic nervous system. During exercise, the sympathetic nerves that innervate the smooth muscles of bronchioles and arterioles regulate the contraction of these smooth muscles to increase ventilation and cardiac output. 2. Multiple choice: Choose one best statement. An infant born prematurely has neonatal respiratory...

Indicate whether the statement is true or false. If false, please explain why. (Note that if...

Indicate whether the statement is true or false. If false, please explain why. (Note that if the explanation is incomplete, you may not get the full credits.) a. Although payroll taxes are imposed on firms, workers bear more burdens than firms when the elasticity of labor supply is greater than the elasticity of labor demand. (4 pts) b. There might be a situation in which dangerous jobs offer lower wages than safe jobs even if there exist compensating wage differentials....

True/False (3 pts each) Indicate whether the statement is true or false. If true, explain why...

True/False (3 pts each) Indicate whether the statement is true or false. If true, explain why it is true and/or give examples to support it. If false, explain why it is false. 2.An increase in plasma osmolality will cause more secretion of ADH.

Indicate whether the following statements are true or false. Explain why (a) The partial molar temperature,...

Indicate whether the following statements are true or false. Explain why (a) The partial molar temperature, the partial molar volume, and the partial molar heat capacity are all proper partial molar quantities because the temperature, volume, and heat capacity are all extensive quantities. (b) (4 points) ∆G and ∆ST ot can be seen to provide equivalent information about the sponteneity of a process. This is because ∆Ssys can be related to −∆H/T and ∆Ssurr can be related to −T∆S. (c)...