AM -vs- PM Test Scores: In my PM section of statistics there are 30 students. The scores of Test 1 are given in the table below. The results are ordered lowest to highest to aid in answering the following questions.
| index | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| score | 44 | 48 | 50 | 52 | 55 | 60 | 61 | 64 | 64 | 65 | 66 | 67 | 68 | 71 | 75 |
| index | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| score | 77 | 80 | 80 | 81 | 82 | 85 | 87 | 88 | 90 | 92 | 92 | 94 | 95 | 99 | 99 |
(a) The value of P90 is .
(b) Complete the 5-number summary.
| Minimum | = | |
| Q1 | = | |
| Q2 | = | |
| Q3 | = | |
| Maximum | = |
In: Statistics and Probability
Q1: Liquid drop model of nuclei: Describe how one
views a nucleus in this model. What is the nucleus made
of?
What is the relationship between the atomic number, A,
and the nuclear radius?
According to this model, how does nuclear density
scale with A?
Q2: What are the indications that the "nucleus is made
of alpha particles" model might work?
Discuss why protons and neutrons could be considered
as the basic constituents of a nucleus?
Why could alpha particles be considered as the basic
constituents of a nucleus?
Where does the "nucleus is made of alpha particles"
model work better, for high A or for low A?
Q3: How many stable nuclei are there? How many
unstable, approximately? What is the highest Z of all stable
nuclei?
What is the reason that there are no stable nuclei
above that Z? Why do high-A stable nuclei have more neutrons
than
protons?
In: Physics
Use the following table to answer the questions below.
| Country | GDP in 2012 | GDP in 2013 | Population in 2013 |
| United States | 16,244,575 | 16,724,272 | 316,438,601 |
| Mexico | 1,177,398 | 1,327,021 | 118,818,228 |
| United Kingdom | 2,476,665 | 2,489,674 | 63,395,574 |
| Kenya | 40,697 | 45,311 | 44,037,656 |
Note that GDP numbers are presented in millions (add six zeros on to each of the reported numbers).
1. Calculate the GDP growth rate for each country between 2012 and 2013. Round to one decimal place.
US:
Mexico:
UK:
Kenya:
2. Calculate GDP per capital for each country in 2013. Round to the nearest whole number.
US:
Mexico:
UK:
Kenya:
3. Which country has the highest standard of living?
(Click to select) Kenya Mexico United States United Kingdom
4. Which country is growing the fastest?
Mexico,United States,Kenya or United Kingdom?
In: Economics
Listed below are the heights of candidates who won elections and the heights of the candidates with the next highest number of votes. The data are in chronological order, so the corresponding heights from the two lists are matched. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% confidence interval estimate of the mean of the population of all "winner/runner-up" differences. Does height appear to be an important factor in winning an election?
Winner 75 72 73 74 72 73 76 73
Runner-Up 74 71 70 70 69 73 72 72
Construct the 95% confidence interval. (Subtract the height of the runner-up from the height of the winner to find the difference, d.)
B) Based on the confidence interval, does the height appear to be an important factor in winning an election?
In: Statistics and Probability
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 76 students in the highest quartile of the distribution, the mean score was x = 178.10. Assume a population standard deviation of σ = 8.21. These students were all classified as high on their need for closure. Assume that the 76 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 2.1 points of the population mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number.)
In: Statistics and Probability
AM -vs- PM Test Scores: In my PM section of statistics there are 30 students. The scores of Test 1 are given in the table below. The results are ordered lowest to highest to aid in answering the following questions.
| index | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| score | 43 | 48 | 50 | 52 | 55 | 60 | 61 | 61 | 64 | 65 | 66 | 67 | 68 | 71 | 75 |
| index | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| score | 77 | 80 | 80 | 81 | 82 | 85 | 87 | 90 | 90 | 92 | 92 | 93 | 94 | 99 | 100 |
(a) The value of P90 is .
(b) Complete the 5-number summary.
| Minimum | = | |
| Q1 | = | |
| Q2 | = | |
| Q3 | = | |
| Maximum | = |
In: Statistics and Probability
A jeweler is considering producing a limited edition diamond bracelet, and she is trying to decide how many bracelets to produce. The table gives her estimated total cost for various production levels as well as the price she would charge for each bracelet. Number of bracelets Total cost (thousands) Price per bracelet 100 $215 $8100 200 $420 $7500 300 $625 $6100 400 $820 $5100 500 $1015 $4200 600 $1205 $3600 (a) Of the production levels listed in the table, which gives the highest profit? (b) Estimate the marginal cost and marginal revenue when 400 bracelets are made. marginal cost $ marginal revenue $ (c) According to the estimates in part (b), will increasing the production level higher than 400 bracelets increase profit? Yes, increasing production will increase profit. No, increasing production will not increase profit.
In: Finance
In: Civil Engineering
In: Statistics and Probability
The Downtown Parking Authority of Tampa, Florida, reported the following information for a sample of 230 customers on the number of hours cars are parked and the amount they are charged.
| Number of Hours | Frequency | Amount Charged | |||
| 1 | 22 | $ | 4 | ||
| 2 | 38 | 6 | |||
| 3 | 52 | 8 | |||
| 4 | 45 | 12 | |||
| 5 | 20 | 14 | |||
| 6 | 12 | 16 | |||
| 7 | 5 | 18 | |||
| 8 | 36 | 22 | |||
| 230 | |||||
Convert the information on the number of hours parked to a probability distribution.
Find the mean and the standard deviation of the number of hours parked. (Do not round the intermediate calculations. Round your final answers to 3 decimal places.)
How long is a typical customer parked? (Do not round the intermediate calculations. Round your final answer to 3 decimal places.)
Find the mean and the standard deviation of the amount charged. (Do not round the intermediate calculations. Round your final answers to 3 decimal places.)
In: Statistics and Probability