 Lv 1197 points

# bubby

• ### Statistics Help Not understanding this problem!!?

In a survey of 7000 women 4431 say they change their nail polish once a week Construct a 90% confidence interval for the population proportion of women who change thier nail polish once a week.

• ### Statistics word problem help!!?

I need the answers to the following questions it seems as if im doing something wrong and I do not know what:

A researcher wishes to estimate, with 90% confidence, the percentage of adults support abolishing the penny. His estimate must be accurate within 2% of the true proportion.

A.Find the minimum sample size needed, using a prior study that found that 25% of the respondents said they support abolishing the penny.

B.No preliminary estimate is available. Find the minimum sample size needed.

A researcher wishes to estimate, with 99% confidence, the proportion of adults who have high speed internet access. Her estimate must be accurate within 5% of the true proportion.

A.Find the minimum sample size needed using a prior study that found that 32% of the respondents said they have high speed internet access.

B. No preliminary estimate is available. Find the minimum sample size needed.

• ### How to make this a double decimal point?

a. Return on assets= \$19, 440/ [\$150,000+\$145,5000/2]=1.32%

What is 1.32% with a double decimal point please calculate it and tell me?

• ### What to say in my thank-you card to the church?

I came home sunday and there was an envelope with my name on it it was a scholarship for me to attend the university that I am currently going to I have a thank-you card and want to put a bit of thankfulness of my own word what would be something good to put into the card as a thank you from me.

• ### I want to know about opening a Ebay store?

I am looking at opening a ebay store selling restaurant equipment I want to know is this a good decision and I am not looking to get rich but to just profit and do what I have to do? any comments and suggestions are gladly welcomed.

• ### How to find Zx and Zy?

If z = 7xy + 9y^2, find zx and zy.

• ### Finding partial derivatives?

Suppose that the output Q (in units) of a certain company is Q = 75K1/3L2/3,where K is the capital expenditures in thousands of dollars and L is the number of labor hours. Find ∂Q/∂K and ∂Q/∂L when capital expenditures are \$729,000 and the labor hours total 9261. (Round your answers to the nearest whole number.)

∂Q/∂K = thousand units

∂Q/∂L = thousand units

• ### How to find the g of x and g of y?

If g(x, y) =sqrt 5xy − 7x , find gx and gy.

• ### How to find the partial derivative?

Find the partial derivative of the following with respect to x at the point (1, 2, -4).

f(x, y) = 2x^3 − 5xy + y^2

• ### Find the derivative of this log?

Find the derivative of the function.

y = e ^sqrt 6x^2 − 7

• ### Find the derivative of this natural log?

Find y'.

y = sqrt ln(9x + 7)

• ### Find the instantaneous rate of change?

The percent concentration y of a certain drug in the bloodstream at any time t (in hours) is given by the following.

y = 100(1 − e^−0.454t)

(a) What function gives the instantaneous rate of change of the concentration of the drug in the bloodstream?

(b) Find the rate of change of the concentration after 1 hour. Give your answer to three decimal places.

• ### Finding the maximum profit?

A large corporation with monopolistic control in the marketplace has its average daily costs, in dollars, given by the following.

C = 700/x + 100x + x^2

The daily demand for x units of its product is given by p = 60,000 − 50x dollars. Find the quantity that gives maximum profit, and find the maximum profit. What selling price should the corporation set for its product?

• ### How many units will minimize average cost?

If the total cost function for a product is C(x) = 7(x + 3)^3 dollars, where x represents the number of hundreds of units produced, producing how many units will minimize average cost?

x = hundred units

Find the minimum average cost. (Round your answer to two decimal places put in dollars per hundred units)

• ### How to find the absolute maxima and minima?

Find the absolute maxima and minima for f(x) on the interval [a, b].

f(x) = x^3 − 7x^2 − 5x + 1, [-1, 7]

maximum (x, y) =

minimum (x, y) =

.

• ### how to find the maximum profit?

A firm has monthly average costs, in dollars, given by the following function where x is the number of units produced per month.

C = 36,000/x + 100 + x

The firm can sell its product in a competitive market for \$1700 per unit. If production is limited to 550 units per month, find the number of units that gives maximum profit, and find the maximum profit.

• ### How to find the maximum revenue?

If the total revenue function for a computer is R(x) = 1800x − 23x^2 − x^3, find the level of sales, x, that maximizes revenue and find the maximum revenue in dollars.

what is x, and also what is the revenue?

• ### How to find the max profit?

A firm can produce 500 units per week. If its total cost function is C = 300 + 1300x dollars and its total revenue function is R = 1800x − x^2 dollars, how many units, x, should it produce to maximize its profit? x= how many units and also find the maximum profit.