During the past year, on the average, 289 books were checked out daily from the public library in Stucco, Wyoming. This year, the city fathers of Stucco have attempted to increase circulation through various promotions such as bookmobiles, youth programs, and visits to local organizations. In order to evaluate their efforts, they have taken a random sample of 50 days of the current year and calculated the mean number of books checked out daily --288-- and the standard deviation--23. Based on this data, it is likely (95% confidence level) that the daily circulation of books has not increased? Please show math step by step. how you would put it in a TI-84 calculator to arrive at your answer

The rechargeable batteries for a laptop computer need a much smaller voltage than what a wall socket provides. Therefore, a transformer is plugged into the wall socket and produces the necessary voltage for charging the batteries. The batteries are rated at 9.0 V, and a current of 272 mA is used to charge them. The wall socket provides a voltage of 120 V.

(a) Determine the turns ratio of the transformer

(b) What is the current coming from the wall socket?
I_p =

(c) Find the average power delivered by the wall socket and the average power sent to the batteries.
P_p =
P_s =

Describe a situation in your everyday life where you could use the scientific method. List all the steps of the scientific method and explain how you would apply each of the steps in that situation.

Describe briefly what are the basic planning and design factors when applying “Escalator”?
Sketch the general layout and the main dimensions of an escalator inclined at an angle of 30o

1.A sample of 80 is drawn from a population with a proportion equal to 0.50. Determine the probability of observing between 33 and 50 successes.

2.For a population that is left skewed with a mean of 27 and a standard deviation equal to 16​, determine the probability of observing a sample mean of 25 or more from a sample of size 37.

3. For a normal population with a mean equal to 80 and a standard deviation equal to 11​, determine the probability of observing a sample mean of 87 or less from a sample of size 11.

2. Calculating the price elasticity of demand: A step-by-stepguide

Suppose that during the past year, the price of a laptop computer rose from $2,750 to $2,880. During the same time period, consumer sales decreased from 446,000 to 321,000 laptops.

Calculate the elasticity of demand between these two price–quantity combinations by using the following steps. After each step, complete the relevant part of the table with the appropriate answers. (Note: For decreases in price or quantity, enter values in the Change column with a minus sign.)

Step 1: Fill in the appropriate values for original quantity, new quantity, original price, and new price.

Step 2: Calculate the average quantity by adding the original quantity and the new quantity, and then dividing by two. Do the same for the average price.

Step 3: Calculate the change in quantity by subtracting the original quantity from the new quantity. Do the same for the change in price.

Step 4: Calculate the percentage change in quantity demanded by dividing the change in quantity by the average quantity. Do the same to calculate the percentage change in price.

Step 5: Calculate the price elasticity of demand by dividing the percentage change in quantity demanded by the percentage change in price, ignoring the negative sign.

Using the midpoint method, the elasticity of demand for laptops is about   .

The following details refer to a centrifugal pump. Outer diameter: 36 cm. Eye diameter: 18 cm. Blade angle at inlet: 28°. Blade angle at outlet: 20°. The flow velocity remains constant at 10 m/s. The whirl at inlet is zero. the manometric efficiency is 95%. If width at outlet is 3 cm, determine the power in W (η₀ = 83%).

there are 2 kinds of carbonyl acceptor structures in addition to benzoate esters that can be used in the reaction with phenylmagnesium bromide in order to produce triphenylmethanol. Also they react with a different number of equivalents of the Grignard Reagent. What are the carbonyl acceptors? please draw structure

If 155 mL of wet H2 is collected over water at 24 ∘C and a barometric pressure of 739 torr , how many grams of Zn have been consumed? (The vapor pressure of water is 22.38 torr.)

Propose a research study on the effects of warming climate and resulting advancing treeline. Assume that your hypothesis is that a bird's growth and reproduction will be negatively affected by the advancing treeline. The bird resides in one forest and flies at high elevations. What is an experiment that could take place? List the research design and methods. What are the materials, replicates for treatments, sampling and measurement procedures?

Suppose that the city of atlanta decided to tax cheeze and a $1 per cheeseburger meal tax is proposed. would you predict that the price of a cheeseburger meal would raise by a dollar in atlanta. explain with the help of a diagram

With the pressure held constant at 210 kPa , 49 mol of a monatomic ideal gas expands from an initial volume of 0.60 m3 to a final volume of 1.7 m3 .

A) How much work was done by the gas during the expansion?

B) What were the initial temperature of the gas?

C) What were the final temperature of the gas?

D) What was the change in the internal energy of the gas?

E) How much heat was added to the gas?

A partial list of Waterways’ accounts and their balances for the month of November follows.

Accounts Receivable       $274,500
Advertising Expenses       54,200
Cash       261,000
Depreciation—Factory Equipment       16,800
Depreciation—Office Equipment       2,500
Direct Labor       41,900
Factory Supplies Used       16,700
Factory Utilities       10,300
Finished Goods Inventory, November 30       68,800
Finished Goods Inventory, October 31       73,100
Indirect Labor       48,100
Office Supplies Expense       1,600
Other Administrative Expenses       71,500
Prepaid Expenses       41,400
Raw Materials Inventory, November 30       52,300
Raw Materials Inventory, October 31       37,600
Raw Materials Purchases       184,100
Rent—Factory Equipment       46,800
Repairs—Factory Equipment       4,600
Salaries       323,000
Sales Revenue
1,354,600
Sales Commissions       40,500
Work In Process Inventory October 31       52,600
Work In Process Inventory, November 30       42,200

  
Collapse question part
(b1)
A list of accounts and their values are given above. From this information, prepare a cost of goods manufactured schedule.

WATERWAYS CORPORATION
Cost of Goods Manufactured Schedule

I also discovered, during our discussion, that he has some very intelligent and innovative family members other than his father which brings up an interesting question. Are some of us born with a predisposition to being innovative?