Explore BrainMass

Quantative Analysis of Data

Multiple choice questions on Normal distribution, Confidence Interval

1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with m = 110 grams and Q(standard deviation)= 25 grams. A sample of 25 vitamins is to be selected. So, the middle 70% of all sample means will fall between what two values? a) 104.8 and 115.2 b) 108.4 and 112.5 c) 115 and 100.7 d) 85 and 12

Queuing: M/M/s model: Comparing no of servers based on total costs

1. Department Store has approximately 300 customers shopping in its store between 9 A.M. and 5 P.M. on Saturdays. In deciding how many cash registers to keep open each Saturday, Schmedley's manager considers two factors: customer waiting time (and the associated waiting cost) and the service costs of employing additional checkou

Batting Average and Company Claims Analysis

These are the only two review questions I would like assistance with. Thank You. 1. A batting average of .400 hasn't been attained for about 70 years. Go to the Baseball data set and compute the 99% CI interval for batting means statistically regarding the difficulty of hitting .400. Baseball Stats attached in Excel. 2.

Skew, coefficients of variation, class limits etc.

1. A group of 100 students were surveyed about their interest in a new International Studies program. Interest was measured in terms of high, medium, or low. 30 students responded high interest; 50 students responded medium interest; 40 students responded low interest. What is the relative frequency of students with high intere

1) develop a point estimate of the mean cost per treatment of the drug; develop a point estimate of the standard deviation 2) What is the probablity that a random sample of 75 students will provide a sample mean SAT score within 10 of the population mean? 3) Show the sampling distribution of p 4) find the value of the standard error of the mean 5) Develop a point estimate of the proportion who are bullish on the stock market

1) Assuming the following numbers are dollar amounts per treatment with a specific drug, develop a point estimate of the mean cost per treatment of the drug. Next, develop a point estimate of the standard deviation of the cost per treatment of the drug. 4376 5578 2717 4920 4495 4798 6446 4119 4237 3814 2) T

Confidence Intervals: Women Height, Package Weights

(23) Assume that the heights of women are normally distributed. A random sample of 20 women have a mean height of 62.5 inches and a standard deviation of 2.3 inches. Use the Chi-Square distribution to construct the 99% confidence interval for the population standard deviation a of women's heights. (24) FedEx Ground would like

Standard Deviation and The Central Limit Theorem

1. Assume that blood pressure readings are normally distributed with a mean of 117 and a standard deviation of a = 6.4. If one person is randomly selected, find the probability that their blood pressure will be less than 119. If 64 people are randomly selected, find the probability that their mean blood pressure will be l

Median, Model, Numerical Measures

Fore more details problems, you can see in attachment file 17. A home theater in a box is the easiest and cheapest way to provide surround sound for a hoem entertainment center. A sample of prices is shown here (Consumer Reports Buying Guide,2004). The prices are for models with a DVD player and for models without a DVD play

Rounding Off, Descriptive Statistics

Rounding Off 1. State the Round-Off Rule as described in Section 3.3. You will use this rule to decide how many decimal places to round the answers in this project. If you have not noticed by now, rounding off is important; at the very least, it can make the difference between a correct and incorrect answer. 2. What is .02

How to calculate mean, median, mode, and quartiles.

5. The Dow Jones Travel Index reported what business travelers pay to hotel rooms per night in major U.S cities (The Wall Street Journal, January 16,2004). a. What is the mean hotel room rate? b. What is the median hotel room rate? c. What is the mode? d. What is the first quartile? e. What is the third quartile? Th

This posting provides different problems on operation management including assignment and transportation problems for hardrock concrete company, ashley's auto top carriers and State of Missouri.

10-7 What is the enumeration approach to solving assignment problems? Is it a practical way to solve a 5 row X 5 column problem? A 7X7 problem? Why? 10-13 The hardrock concrete company has plants in three locations and currently working on 3 major construction projects, each located at a different site. The shipping cost per

Mean, Mode, Median, Variance and Standard Deviation

I need the attached discussion question answered as the solution in my textbook is too hard to understand. Please respond to the following discussion question. You are given the following data. Student Number Age Income/ thousands Hours Studying /Per Week Final Grade Gender 1 46 37 6 70 M 2 53 46 19 92 F 3 34 25 20 95

Quantitative Analysis - Break even

Really need help with this problem. Please show me how to set it up in the correct steps. a. Ryan is planning to finance her college education by selling programs at the football games for her team. there is a fixed cost of $400 for printing these programs, and the variable cost is $3. there is also a $1,000 fee that is p

Uses of statistical information in Healthcare

Hello, I need help with "uses of statistical information" in healthcare. I need to figure out what data in important to a healthcare organization, description of data, data definitions and type, and discuss the advantages of accurate interpretation. Word count 400 Cite and reference data (website) Example of data: Uses of

Statistical Form Report on a Dataset

Please assist with these problems and use two separate Excel for each problem. The same attached file information is used for both problems. 1.Using the water use data set analyze the data using Excel and report in proper statistical form/jargon about the dataset. 2. Using the water use data set analyze the data using Exc

Quantitative Methods Problem Solving

Please help with the following problems. The following table gives the marks (out of a total of 50 ) scored by 30 candidates in an examination : 5 5 7 10 10 11 12 15 16 17 19 19 19 20 20 20 20 21 26 26 27 28 30 30 33 36 37 37 40 45 1. Using class intervals equal to 5 marks, construct a less than cumulative frequency

What is the Mean, Median, Mode and Standard Deviation?

What is the Mean, Median, Mode and Standard Deviation using the following: SAMPLE DATA: 2, 5, 7, 11, 12, 16, 16 1) What is the mean of X of the data above (TO THE NEAREST 1/10)? 2) What is the median of the data above? 3) What is the mode of the data above? 4) What is the standard deviation of the data ab

Machine Operation Quantitative Analysis

The table below gives the times during working hours in a factory when a certain machine is not operating as a result of a breakdown: TIME(MINUTES) NO. OF BREAKDOWN 0 - 9 3 10 - 19 10 20 - 29

Discounts and Carrying Costs

A distributor of metal detectors has an annual demand of two thousand units for a certain type.The cost to the distributor is $400 per detector, carrying cost is estimated to be 20% of the unit cost and the ordering cost is $25 per order. If the Distributor orders in quantities of 250 or more, he can get a discount of 10% on the

When a pizza restaurant's delivery process is operating effectively

When a pizza restaurant's delivery process is operating effectively, pizzas are delivered in an average of 45 minutes with a standard deviation of 6 minutes. To monitor its delivery process, the restaurant randomly selects five pizzas each night and records their delivery times. a. For the sake of argument, assume that the p

True Mean and Standard Deviation

I have created 95% confidence interval estimates of the population mean µ from your data in columns E and F. I have used the fact that I know σ is 6.5, that the sample was from a normal population, and that you all took samples of size 10. Therefore, the interval becomes sample mean ± 1.96*6.5/3.16. (3.16 is the appro

Finding the mean and the median (3 questions)

(1.) Using a random sample from 2002 general Social Survey, you find the following grouped distribution Age Category Frequency 18-29 54 30-39 54 40-49 60 50-59 36 60-69 31 70-89 27 a- Calculate the median age category. b- Also,

Various stat questions

Section 1 - Applications of Unconstrained Optimization 1) A perfectly competitive pumpkin patch faces the following cost function: TC(Q) = 14Q2 - 650Q + 15 And the patch sells pumpkins for $15. What is the profit maximizing output? Is the output you found a profit max? Show. 2) A local hammer manufact