Explore BrainMass


Occupational Group for Alcoholism

A state magazine once published a story saying that farmers lead other groups in the consumption of alcohol. As evidence, it pointed to the fact that a rehabilitation center located in the rural part of the state treated more farmers than any other occupational group for alcoholism. Do you agree? Why or why not? Justify your

Identifying Sample and Populations

Identify the sample and population 1. a. A group of 50,000 randomly selected college students were surveyed about whether they have a TV in their dorm room. Only 75% said yes to the question. i. Sample - ii. Population - b. An employee at the local ice cream emporium asks 3 customers if they liked cookie dough ice

Sample Distribution for Work Processing Formulas

I need to word-process the formulas using the Equation function in MS Word(not using Excel). Time lost due to employee absenteeism is an important problem for many companies. The human resources department of Western Electronics has studied the distribution of time lost due to absenteeism by individual employees. During a on

Sampling and Sampling Distribution-3 questions

1. Suppose you need to sample the concentration of a chemical in a production process that goes on continuously 24 hours per day, 7 days per week. You need to generate a random sample of six observations of the process over a period of one week. Use a computer, a calculator, or a random number table to generate the six observa

Distribution of proportion

Central limit theorem: Sample proportion A minority representation group accuses a major bank of racial discrimination in its recent hires for financial analysts. Exactly 10% of all applications were from minority members, and exactly 8% of the 900 open positions were filled by members of the minority. 1. Find the mean of

Sampling Distributions

Strater, Inc. makes particleboard for the building industry. Particleboard is made by mixing wood chips and resins together, forming the mix into 4 foot by 8 foot sheets, and pressing the sheets under extreme heat and pressure to form a sheet that is used as a substitute for plywood. The strength of the particleboard is tied to

Homogeneous Grouping Samples

What type of sample methods are these? a. Certain kinds of either typical or atypical cases are deliberately chosen. b. large proportion of very small homogeneous groupings than larger ones.

Discuss statistics concepts

Can you help me explain these: Systematic sample Stratified Sample Weighted mean Standard deviation Mutually exclusive events Independent events, and Expected value Please include example in your response to enhance my understanding. Thanks

Statistics: Samples vs. Populations

In your opinion can you explain the difference between a population and sample and why do we normally study a sample than a population? Provide a brief discussion of the following. Include examples in you response to enhance my understanding: systematic sample; stratified sample; weighted mean; standard deviation; mutually ex

Calculating sample variances and poolded variance

One sample has SS = 35 and a second sample has SS = 45. a. Assuming that n = 6 for both samples, calculate each of the sample variances, then calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances. b. Now assume t

Techniques for gathering data: Sampling, experiment, simulation, census

What technique for gathering data (sampling, experiment, simulation or census) do you think was used in each of the following studies? a) A computer program was used to model global weather patterns and to produce long-range weather forecasts for a rural agricultural region. b) A random sample of 1,000 residents of a major

Survey methods for marketing.

A food chain company based in Florida wants to expand in Georgia. You, as a part of the marketing team, are required to find the popularity of fast food among the younger generation. What method is best suited for such a survey? Draw the sample using the random number table and bring out the rationale of the procedure.

Sample spaces and sets, union and intersectons

Please see the attached file. ------ In control replication, cells are replicated over a period of two days. Not until mitosis is completed, can freshly-synthesized DNA be replicated again. Two control mechanisms have been identified - one positive and one negative. Suppose that a replication is observed in three cells.

Automotive Suppliers: Quality Control

An automotive industry supplier produces pistons for several models of automobiles. Twenty samples, each consisting of 200 pistons, were selected when the process was known to be operating correctly. The numbers of defective pistons found in the samples follow. SEE ATTACHMENT FOR TABLE a.What is an estimate of the prop

Sample Size - A New York Times article about poll results states, "In theory, in 19 cases out of 20, the results from such a poll should differ by no more than one percentage point in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.

A New York Times article about poll results states, "In theory, in 19 cases out of 20, the results from such a poll should differ by no more than one percentage point in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.

MCQs in Statistics - Answers and explanations are both required.

There are 10 multiple choice questions but i need all work shown and explanation for answers: 1. The Central Limit Theorem says that , if n exceeds 30, a histogram of the sample will have a bell-shape, even if the population isn't normal. A) True B) False 2. In a sample size calculation for a mean, if the

Random Sampling

You have 400 employees, numbered 1-400. you want to interview 15. Describe how to randomly select the employees. Please solve on excel spreadsheet.

Census, experiment, simulation, and sampling

I have to state if the answer is experiment, census, simulation, or sampling. I have my answers but I am not certain of one of them. 1)An Analysis of a sample of 20,000 people from LA had suggested that elderly and homeless sue for malpracticeat 1/4th the rate of wealthier patients. 2)The effects of wind on the takeoff an

Continuous Probability Distributions and Sampling Distributions

1. Consider a multiple choice examination with 50 questions. Each question has four possible answers. Assume that a student who has done the homework and attended lectures has a 75% probability of answering any question correctly. a) A student must answer 43 or more questions correctly to obtain a grade A. What percentage

Sampling Error - M&Ms

Total pieces was 57 Color Sample M & M Count Website Count (%) Sampling Error +/- Blue 23.2% 24% .8% Red 10.7% 13% 2.3% Yellow 12.5% 14% 1.5% Orange 17.9% 20% 2.1% Green 17.9% 16%

Mutual Funds in Random Sample

The Wall Street Journal provides the net asset value, the year-to-date percent return, and the three-year percent return for 555 mutual funds (The Wall Street Journal, April 25, 2003). Assume that a simple random sample of 12 of the 555 mutual funds will be elected for a follow-up study on the size and performance of mutual fu

Sample Distribution - New York Stock Exchange

This question has to deal with the sampling distribution of the sample mean. Please see attached file for full problem description. Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4% and a standard deviation of

Random Sample - An American Society of Investors survey found 30 percent

An American Society of Investors survey found 30 percent of individual investors have used a discount broker. In a random sample of nine individuals, what is the probability. a. Exactly two of the sampled individuals have used a discount broker b. Exactly four of them used a discount broker. c. None of them used a disco

Secondary Data on Reliable Tests

1) Please share 3 real world examples of problems, which occurred due to the use of secondary data. Be specific about the consequences as well the secondary data used. You may use your own organization or research the net or literature for this one. 2) Can a marketing survey to research consumers' taste be developed for a g

population and standard deviation

6.16 A population has distribution of unknown shape. The mean of the population is 3,500, and the standard deviation is 600. a. If a sample of 100 values is selected randomly from this population, what is the probability that the sample mean will exceed 3,600? b. If a sample of 200 is selected from the population what is the

Stats Exercise Questions

11. An example of a measurement made in a nominal scale is: a.the name of the college a student attends. b.a student�s weight in kilograms. c.a student�s class rank, such as 25th out of 364. d.a student�s sex (male or female). e.both (a) and (d). 12. The net asset value of a mutual fund has increased