Explore BrainMass


Rape Victim Statistics

A report by the Department of Justice on rape-victims reports on interviews with 3721 victims. The attacks were classified by the age of he victim and the relationship of the victim to the rapists. The results of the study are given in the table below. Relationship of Rapist Age of Victim Family Acquaintance or Friend S

Home market sales probabilities

The Board of Realtors of a small city reports that 80% of the houses that are sold have been on the market for more than 6 months. The Board takes a random sample of 15homes that have recently been sold and counts the number that were on the market for more than 6 months. What is the Probability that of 15 homes in the sample:

Sampling plan and probability

Seiko purchases watch stems in lots of 10,000. Seiko's sampling plan calls for checking 20 items,and if 3 or fewer are defective, the lot is accepted. Based upon their sampling plan, what is the probability that a lot of 10 percent defective will be accepted.

Personal Probability vs. Population Proportion

Marital Status. The probability that a randomly chosen 40-year-old woman is divorced is about 0.15. this probability is a long-run proportion based on all the millions of women aged 40. Let's suppose that the proportion stays at 0.15 for the next 20 years. Bridget is now 20 years old and is not married. (a) Bridget think


1. How many ways can 15 girls be chosen to form a baseball team (need 9 players)? 5005 1,816,214,400 24 135 3. Use this table to answer questions #3 through #6. Some students were asked if they carry a credit card. Here are the responses. Class______ | Credit Card Carrier | Not a Credit C

Random Walk and 1-Dimensional Heat Equation and its Fundamental

Suppose that a particle, starting at the origin, has an equal chance of moving to the left or right by a distance ∆x in a time interval of ∆t. (a) Let n>0 be an integer, and let m be an integer, such that -n≤m≤n and n-m is even. By computing the number of ways that the particle can move a net distance

Additional rule of probability

1. During a 52 week period, a company paid overtime wages for 18 weeks and hired temporary help for 9 weeks. During 5 weeks, the company paid overtime and hired temporary help a. Are the events "Selecting the week that contained overtime wages",and "selecting a week that contained temporary help wages" mutually exclusive? Exp

Poisson distribution and unbiased estimator

I'm stuck on this problem and I was wondering if someone could help me out. My initial guess is that if you set e^-cY equals to e^-theta => you'll get that e^-c(ntheta) = e^-theta => c = 1/n. However, I'm not sure that this is right for a. I have no idea how to begin B and C, but I know that 1/n goes to zero as n -> infinity.

Correlation, Z-score, hypothesis, probability

1. True or false. a. The decision to use z-scores or Student's t-scores depends first on the size of the sample. b. When there is correlation between two data sets, there is always an underlying cause. c. The probability of an event plus the probability of the complementary event always equals 1. d. The population parame

MaxiMin - MiniMax, Expected Value

The marketing department of a soft-drink company wishes to determine the maximum expected payoff from introducing a new crystal-clear drink. Assume that the marketing department works in a risk taking company. Which decision would they likely pursue? (MaxiMax) Calculate the opportunity lost table. Assume that the mark

Statistical Probability Tree

See the attached file. Your firm is planning a new style of advertising and figures that the probability of increasing the number of customers is 0.63, while the probability of increasing sales given an increase in the number of customers is 0.651. Also assume that when there is no increase in the number of customers, there is

Statistics and Probability

A sample of 2,000 licensed drivers revealed the following number of speeding violations. Number of Violations Number of Drivers 0 1,910 1 46 2 18 3 12 4 9 5 or more 5 Total 2,000 What is the experiment? List one possible event? What is the probability that a particular drive had exactly two

Statistics Problems

1. What is the value of the binomial coefficient: combination 100 and zero? 2. If 60 percent of US households live with one or more pets and 4 of these US households are selected at random without replacement, what is the probability that the number of households has one or more pets, at most three? 3. A quantitative data set

Probability and Sample Size

See attached file for full problem description. 15. Captain D's tuna is sold in cans that have a net weight of 8 ounces. The weights are normally distributed with a mean of 8.025 ounces and a standard deviation of 0.125 ounces. You take a sample of 36 cans. Compute the probability that the sample would have a mean: a.

Probability & Usage Guarantee

11. A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes. a. Determine the height. b. How long does the typical test taking time? c. Determine the standard deviation of the test taking time.

What is probability?

What is probability? How is probability concept used in making business decisions? Please explain with real life examples.

Statistics Questions- Normal distribution, z score, survey, sampling methods,

14. On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the Z scores for persons who score (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z scores on this test are (d) 2.4, (e) 1.5, (f) 0, and (g) _4.5. 15. A person scores 81 on a test of verbal ability an

Age of Terminated Employees

Tri-States Mining has been forced to terminate 10% of its work force because of low market prices for the ore it produces. A group of recently terminated employees (age 55 and older) has filed a lawsuit claiming that age discrimination was practiced by the company during the termination process. Analysts have determined that 1

Find the number suits/ties available

In his wardrobe at home, a businessman has 7 suits and 8 ties. From those suits and ties he has on hand, he plans to take 3 of the 7 suits and 2 of the 8 ties with him to a conference in San Francisco. How many different possible suit-ties combinations can he choose from to wear PRIOR TO LEAVING FOR HIS TRIP? Consider:

Binomial Probability Description Preferences

See attached file for full problem description. The Baldwin Sisters from the Walton's TV series had a family recipe for moonshine (a strong, home-distilled alcoholic beverage)? Anyway, the Sister's made a slight modification in their father's recipe for moonshine. They conducted a test of taste preference between the new reci

Inventory Management Economic Order Quantity

1. Suppose that the R&B Beverage Company has a soft drink product that has a constant annual demand rate of 3600 cases. A case of the soft drink costs R&B $3. Ordering costs are $20 per order and holding costs are 25% of the value of the inventory per year. R&B has 250 working days per year and the lead time is 5 days. Identi

Probability Distribution

1) A test consists of 690 true or false questions. If the student guesses on each question, what is the mean number of correct answers? A) 0 B) 138 C) 345 D) 690 2) IQ test scores are normally distributed with a mean of 101 and a standard deviation of 13. An individual's IQ score is found to be 103. Find the z-score corres

Sales Goals for Telemarketer

Setting goals for your sales force is a balancing act: the goal should be high enough to be challenging but not so high that there is little chance of making it - that will just depress the sales force. In telemarketing sales, only one "completed contact" (the telemarketer gets to finish the pitch on the phone) in 20 ends up t

Suppose that WPC is only considering going directly to the national market or not (ignore the test market for right now). Which of these two alternatives has the highest expected return?

2. The WP Company (hereinafter, WPC) is trying to decide whether to market a new product. As in many new product situations, there is considerable uncertainty about whether the new product will eventually "catch on" (a technical marketing term meaning "sell a lot"). WPC believes it might be smart to introduce the product in a

Probability based on normal and binomial variable

Question 6 A manager must select 2 people from a list of 13 specialized employees to form a special group. In how many ways can the manager choose to select 2 people? [Hint: Fundamental counting principle] Question 7 57% of families say that their children have an influence on their vacation destinations. Consider a random

Binomial distribution formula

Solve for the probabilities of the following binomial distribution problems by using the binomial formula. b. If n = 6 and p = .50, what is the probability that x >= 1? c. If n = 9 and p = .85, what is the probability that x > 7? d. If n = 14 and p = .70, what is the probability that x<=3? Use Table A.2, Appendix A, to fin

Statistics Multiple Choice - Probability and Z Test

11. Find the area under the normal curve to the right of z - = -1.66 a. 0.9515 b. 0.9525 c. 0.0485 d. 0.0475 12. Find the area under the standard normal curve between z= 0 and z=3 a. 0.0010 b. 0.4987 c. 0.4641 d. 0.9987 13. Find the area under the standard normal curve between z =1 and z = 2. a. 0.5398 b. 0.


Data on the 30 largest bond funds provided one-year and five-year percentage returns for the period ending March 31,2000. Suppose we consider a one-year return in excess of 2% to be high and a five-year return in excess of 44% to be high. One-half of the finds had a one-year return in excess of 2%, 12 of the funds had a five-yea

Basic Statistics in PHStat

1) Need to create a statistical table & chart in EXCEL with corresponding verbiage that describes them - with at least 5 different visuals with verbiage. See the attached example [You may need PHStat2]. 2) Need a single word file containing the excel output and written descriptions, and the verbiage that would go with des