The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 400 hours and a standard deviation of 10 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of the mean? Use the Empirical Rule and write your answer as a percent rounded to 2 decimal places.

Calculate the empirical forumla of your compound. Set the formula in the form Ni(Cl)x(NH3)y where x and y are determined from their titration results.

From my titration results:

% mass of Ni+2= 25.8% (0.192mmol)

% mass of Cl- = 26.8% (0.315mmol)

% mass of NH3 = 45.4% (1.12mmol)

A greenish blue salt known to be composed of copper and chloride ions is dissolved in DI water. Aluminum metal is used to reduce the copper ions to metallic, copper, which is then collected, dried and weighed. If the original sample has mass 1.362g and the collected copper has mass .635g, what is the empirical formula of the compound?

a) Methyl Heptenone contains the elements C, H, and O and has a lemon-like odor. The complete combustion of 192 mg of Methyl Heptenone produces 528 mg of CO₂ and 216 mg of H₂O. What are the percent compositions of C, H, and O in this compound?

b) What is the empirical formula for Methyl Heptenone?

1.)

Assume you see that two macroeconomic variables are correlated with each other. But you want to know if there’s an underlying or causal relationship between the two variables. Would you use an empirical or theoretical investigation? Explain why.

2.)

Identify six disadvantages of markets (i.e. cases of market failures).

Describe two reasons why perfectly competitive markets maximize economic efficiency.

Rubric:

The conclusion/opinion is supporting using specific examples from economic theory, empirical evidence or policy issues and are clearly connected to the question

Includes correct facts and definitions concerning economic theory, evidence or policy issues.

What are the empirical formulas of substances with the following mass percent compositions?

(a) aspirin 4.48% H, 60.00% C, 35.52% O

(b) ilmenite (a titanium-containing ore) 31.63% O, 31.56% Ti, 36.81% Fe

(c) sodium thiosulfate (photographic "fixer") 30.36% O, 29.08% Na, 40.56% S

1. Experience and formal education were often used as a proxy for (entrepreneurial) ability. Briefly discuss the advantages and disadvantages of using each of them. How does your answer help explain why empirical studies of entrepreneurial choice often include both measures (such as years of schooling and years of work experience)?

Defining Requirements - The next step is to identify the essential requirements for the information system. In addition to the stakeholder interests identified above, review the Case Study, especially the interviews, highlighting any statements that tell what the person expects the system to do. Functional requirements express specifically what the user needs the system to do. This can be in terms of tasks the users need to perform, data they need to input, what the system might do with that data input, and output required. Non-Functional requirements express how the system will perform in several performance areas and security. As a member of the CIO's organization, you will use your professional knowledge to Identify 5 Functional Requirements (including one specifically related to reporting) and 5 Non-Functional Requirements (including 2 security-related requirements). Refer to Week 6 content on requirements; security requirements are covered in Chapter 6 of the textbook. Additional research can expand your knowledge of these areas.

Once you have written down the 10 requirements, evaluate each one using the criteria below and create 10 well-written requirements for the new hiring system.

The requirement statement:

• Is a complete sentence, with a subject (system) and predicate (intended result, action or condition)

• Identifies only one requirement; does not include the words "and," "also," "with," and "or."

• For Functional Requirements, states what tasks the system will support or perform

• For Non-Functional Requirements, states how the system will perform.

• Includes a measure or metric that can be used to determine whether the requirement is met (time or quantity), where appropriate

• Is stated in positive terms and uses "shall" (not "may" or "should"); "the system shall xxxx" not "the system shall not xxx"

• Avoids the use of terms that cannot be defined and measured, such as "approximately," "robust," "user friendly," etc.

• Is achievable; avoids terms such as "100% uptime," or "no failures" For a full requirement specification, there will be many requirements statements; you only need to provide the number of requirements identified for each category. Do not provide generic statements but relate to the needs of CIC to improve its hiring process.

(Provide an introductory sentence and copy the table and insert information within.)