The complete question is as follows:
The admission directory of Big City University has a novel idea. He proposed using the IQ scores of current students as a marketing tool. The university agrees to provide him with enough money to administer IQ tests to 50 students. So the director gives the IQ test to an SRS of 50 of the university’s 5000 freshman. The mean IQ score for the sample is xbar=112. The IQ test he administered is known to have a σ of 15. What is the 95% Confidence Interval about the mean? What can the director say about the mean score of the population of all 5000 freshman?
Answer: The 95% confidence interval about the mean is 
.
The director can say that he is 95% confident that the mean IQ score of the 5000 freshmen lies between 107.84 and 116.16.
We follow these steps to arrive at the answer:
Since the population standard deviation of the IQ test is known, we can use the Z scores to find the confidence interval.
The formula for the confidence interval about the mean is:
In the equation above, X bar is known as the point estimate and the second term is known as Margin of Error.
The Critical Value of Z at the 95% confidence level is 1.96.
Substituting the values in the question in the equation above we have,
The minimum sales required by Jennifer to meet her savings goal must be $26.25 per hour or $2100 for September.
Given that,
Savings desired = $1500
Monthly expenses = $600
Let money earned by her every hour be 
No. of scheduled work hours 
So,
Total money earned for the month ×
As we know,
Money left = Total money earned - expenses
- 
...(i)
A.T.Q.
Money left must be = $1500
Then, by putting the variables in equation (i), we get
Now, solving for
_______________
∵ 
Thus, the required sales are $ 
per hour or ( × = $2100) for the month of September.
Learn more about 'savings' here:
brainly.com/question/18051939
The numerator of the return on common stockholders' equity is net income minus preferred dividends.
Option d
<u>Explanation:</u>
Return on common stockholders' equity which is also named as return on equity (ROE) ratio evaluates the accomplishment of a company in resulting income for the benefit of common stakeholders.
<em>Use of return on equity:</em>
- Isolates common equity returns
- Can be used to evaluate dividends
- Evaluates the use of capital by the management
It is calculated by income available for stockholders divided by the total number of common stock and is expressed or represented in percentage. Income available for common stockholders can be arrived by reducing preference dividends from Net income.
That is, 
Hence, net income minus preferred dividends is the right answer.
Answer:
D. -4/5
Explanation:
Given that
Wage rate = $20 per hour
Cost of capital = $25 per hour
Recall that,
Slope of isocost = -(w/r)
Where,
W = wage rate
r = rental cost of capital.
Thus,
Slope of isocost curve
= -(20/25)
= -0.8 or -4/5
Note that, the negative of the ratio is the price of the two inputs. Also isocost is a line showing the various combinations of inputs which cost the same amount.
