Project 2 InstructionsEver wonder how your electricity bill is computed?

September 30, 2019/in Questions Uploads /by Hannah Wangui

Question

Project 2 InstructionsEver wonder how your electricity bill is computed? The following

table gives the watts of power that are typically required by several major (and not so major) appliances. (Source: http://www.wholesalesolar.com/solar-information/how-to-save-energy/power-table, with some numbers rounded off for computational convenience.)

Table 1:

Appliance

Central Air Conditioner

Clothes Dryer

Oven

Dishwasher

Ceiling Fan

LCD TV

Satellite Dish

Clock Radio

Watts

5000

3400

3000

1350

100

200

30

7

Assume that the number of hours that the aforementioned appliances run during an average day is given in the table below:

Table 2:

Appliance

Central Air Conditioner

Clothes Dryer

Oven

Dishwasher

Ceiling Fan

LCD TV

Satellite Dish

Clock Radio

Hours

8

1.5

1

2

12

4

24

Add columns to the Project 2 Data spreadsheet that show the following for each appliance:

1. The number of kilowatts of power required by each of these appliances (1 kilowatt = 1000 watts).

2. If the appliance runs the number of hours specified in Table 2, compute the kilowatt-hours (kWh) of energy that each appliance consumes during an average day.

3. The number of kilowatt-hours used by each appliance in the entire YEAR.

4. Assuming that electricity costs $0.12 per kWh, find the electricity cost of running each appliance for the entire year.

5. According to the US Energy Information Administration (see “How much coal, natural gas or petroleum is used to generate a kilowatt-hour of electricity” on https://www.eia.gov/tools/faqs/), it requires 0.00052 tons of coal to generate 1 kWh of electricity. Use this conversion to find how much coal would be required to run each of these appliances for a year.

6. The same source also states that 0.00173 barrels of oil will generate 1 kWh of electricity. Like question 5, find how much oil each appliance would consume on an annual basis.

7. Add a “Total” row to the spreadsheet that shows how much electricity is consumed by all 8 appliances combined in the course of a day and of a year. Also, find the cost, the amount of coal that would be required, and the barrels of oil that would be required in order to run all 8 appliances for a year.

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I need help with these four questions and explain how arrived at each answer

September 30, 2019/in Questions Uploads /by Hannah Wangui

Question

I need help with these four questions and explain how arrived at each answer
1) You are given

the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals.

A random sample of 35 gas grills has a mean price of $637.60. Assume the population standard deviation is $57.10.

The 90% confidence interval is ( , )

(Round to one decimal place as needed.)

The 95% confidence interval is ( , )

(Round to one decimal place as needed.)

2) A publisher wants to estimate the mean length of time (in minutes) all adults spend reading newspapers. To determine this estimate, the publisher takes a random sample of 15 people and obtains the results below. From past studies, the publisher assumes sigmaσ is 2.1 minutes and that the population of times is normally distributed.

10

9

7

9

8

10

12

8

6

11

6

8

12

Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient, use technology to construct the confidence intervals.

The 90% confidence interval is ( , )

(Round to one decimal place as needed.)

The 99% confidence intervals is ( , )

(Round to one decimal place as needed)

3) Construct the indicated confidence interval for the population mean muμ using the t-distribution.

c equals=0.99, x over bar x equals=12.8, s equals=4.0, n equals=10

The 99% confidence interval using a t-distribution is left parenthesis nothing comma nothing right parenthesis .

,

.

(Round to one decimal place as needed.)

4)In a random sample of 26 people, the mean commute time to work was 32.5 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 98% confidence interval for the population mean mu μ. What is the margin of error of mu μ? Interpret the results.

The confidence interval for the population mean mu μ is left parenthesis nothing comma nothing right parenthesis .

,

.

(Round to one decimal place as needed.)

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I need two questions answered and explain how arrived at each answer

September 30, 2019/in Questions Uploads /by Hannah Wangui

Question

I need two questions answered and explain how arrived at each answer:
1) Find the margin of

error for the given values of c, sigmaσ, and n.

c equals=0.90, sigma σ equals=3.7, n equals=36

LOADING… Click the icon to view a table of common critical values.

E equals=

(Round to three decimal places as needed.)

2) The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below.

Assume the population is normally distributed.

2.2

3.4

2.9

1.8

0.5

4.0

2.3

1.4

3.6

0.3

2.3

3.4

(a) Find the sample mean.

x over bar x equals=

(Round to two decimal places as needed.)

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The grade point averages (GPA) for 12 randomly

September 30, 2019/in Questions Uploads /by Hannah Wangui

Question

I need help with this questionThe grade point averages (GPA) for 12 randomly selected college students

are shown on the right. Complete parts (a) through (c) below.

Assume the population is normally distributed.

2.2

1.8

2.3

0.3

3.4

0.5

1.4

2.3

2.9

4.0

3.6

3.4

Find the sample standard deviation

s= (Round two decimals places)