Which database shows parent-child relationship? A. relational B. distributed C. hierarchical D. analytic

skelet666 [1.2K]

Answer:

Margin of safety is a principle of investing in which an investor only purchases securities when their market price is significantly below their intrinsic value. ... Alternatively, in accounting, the margin of safety, or safety margin, refers to the difference between actual sales and break-even sales

5 0

3 years ago

The Centers for Disease Control and Prevention (CDC) defines a healthy sleep duration

laiz [17]

a. The point estimate of the married people that sleep well is = 0.6299. The confidence interval for the mean hours of sleep for those that have never been married but report good sleep is 0.6186, 0.6412

b. The point estimate of the number of hours for people that have never been married = 7.2257

95% confidence interval for the mean number of hours of sleep for those who have never been married = 7.2065, 7.2447

c. the estimated number of sleep for those that have never been married = 7.729 hours

a. The point estimate

$P=\frac{Xp}{n}$

$Xp = successes\\n = sample size\\$

Those who have never been married n = 7044

Xp = those who sleep for 7 hours at least

To get Xp, the excel function

Countif(range, criteria)

Countif(A:A, >=7)

This gives Xp = 4437

Point estimate =

$\frac{4477}{7044}$

= 0.6299

The point estimate of the married people that sleep well is = 0.6299

At 95% interval of confidence,

α = 1-0.95 = 0.05

α/2 = 0.05/2 = 0.025

Z0.025 = 1.96 ( Use the standard probability normal table)

Margin of Error

= $M.E = 1.96\sqrt \frac{0.6299(1-0.6299)}{7044} \\\\= 1.96\sqrt{0.000033} \\\\1.96*0.0057$

= 0.0113

The 95% confidence interval

= 0.6299 - 0.0113 , 0.6299 + 0.0113

= 0.6186, 0.6412

The confidence interval for the mean hours of sleep for those that have never been married is 0.6186, 0.6412

b. Sample mean

x = ∑x/n

x = number of sleep of the never been married

Mean is calculated using excel function

Average(range)

Average(a:a)

This gives the sample mean = 7.2257

The point estimate of the number of hours for people that have never been married = 7.2257

Standard deviation using excel =

Stdev(A:A) = 0.8211

$Margin of error =1.96*\frac{0.8211}{\sqrt{7044} }$

= 0.0192

The confidence interval =

= 7.2257-0.0192, 7.2257+0.0192

= 7.2065, 7.2447

95% confidence interval for the mean number of hours of sleep for those who have never been married = 7.2065, 7.2447

c. From the available data, the mean number of sleep per day that is gotten from the 4437 people that are unmarried and sleep healthily for at least 7 hours = 34295.1

Mean = 34295.1/4437

= 7.729

the estimated number of sleep for those that have never been married = 7.729 hours

6 0

3 years ago

If the purpose of a licensing statute is to raise revenue, a contract with an unlicensed professional may be enforceable.

pishuonlain [190]

If the purpose of a licensing statute is to raise revenue, a contract with an unlicensed professional may be enforceable is TRUE.

Revenue raising statutes. these are licensing statutes enacted to elevate money for the government. unlicensed persons can put in force contracts and recover for rendering services.

Specialists to gain a license, authorities has some say over who can carry out which jobs as well as how many people can perform those jobs. 2. the second main purpose of licensing statutes is extra intently related to the general public interest.

Business licenses preserve corporations accountable for their sports and conduct and guard the general public's fitness and safety. professional licenses imply the quantity of competence and know-how that a specific professional possesses.

Learn more about licensing statute here:- brainly.com/question/15443448

#SPJ4

3 0

1 year ago

Cyberphone, a manufacturer of cell phone accessories, ended the current year with annual sales (at cost) of $72 million. During

viktelen [127]

Answer:

INCREASE IN AVERAGE INVENTORY VALUE REQUIRED = $2.25 million

Explanation:

Inventory turnover will be determined as :

Inventory turnover = Annual sales ( at cost ) / Inventory value

Annual sales this year = $72million

Inventory turnover = 8 times

Therefore , Inventory value of current year = $72/8 =$ 9 MILLION

If annual sales ( at cost ) increases by 25%, Inventory value also has to increase by 25% to maintain the same inventory turnover ratio next year

Therefore , increase in average inventory value required = 25% of $9 million = $2.25 million

INCREASE IN AVERAGE INVENTORY VALUE REQUIRED = $2.25 million

5 0

3 years ago

Fitness Fanatics is a regional chain of health clubs. The managers of the clubs, who have authority to make investments as neede

pantera1 [17]

Answer:

34.04%

Explanation:

Data provided :

Total sales of the Springfield Club = $ 920,000

The net operating income of the company = $ 34,040

The average operating assets of the company = $ 100,000

now,

The return on investment will be calculated as:

Return on investment (ROI)= $\frac{\textup{Net operating income}}{\textup{Average operating assets}}$

on substituting the values, we get

ROI = $\frac{\$\ 34,040}{\$\ 100,000}$

or

ROI = 34.04%

3 0

3 years ago