A medical test for malaria is subject to some error. Given a person who has malaria, the probability that the test will fail to reveal the malaria is 0.06. Given a person who does not have malaria, the test will correctly identify that the person does not have malaria with probability 0.91. In a particular area, 20% of the
1. A large shipment of computer chips is known to contain 8% defective chips. Suppose you select 500 chips at random. (a) What distribution does the number of defective chips in the sample of 500 satisfy? (Please characterize its relevant parameters.) (b) Suppose that you wish to calculate the probability that the numb
Suppose that over the next several years, there will be 100 cardiac incidents at Silver's. Without a defibrillator, 30 victims will die before paramedics arrive. With a defibrillator, there is an 80% probability of saving a victim who would die without it. However, there is a 3% probability that improper use of the defibrilla
A standard surgery was performed on 50 patients with severe sinus infection, and 36 were cured. a) Find a 95% confidence interval for the population cure rate or proportion. =0.5955, 0.8445 b) Do these data indicate that the population cure rate or proportion is more than 70%? Do a hypothesis test. Use alpha=0.05. z=0.30
I need some help figuring this question out: Let x be a random variable that represents the speed of the first vehicle passing an observation point between 11am to 12n on a remote highway, automatically recorded by a police radar. Based on past recording over many days, the random variable has an approximate normal distributio
I need some help answering this conditional probability question: The following table is based on a random sample of 100 employee in a large fortune 500 company # of days a week one exercises 2 or fewer days 18 (Male) 12 (Female) 3 or more d
Looking for assistance to make sure I am calculation answers correctly for the following 2 scenarios. Please provide the answer and any formulas in excel spreadsheet. A standard deck of playing cards consists of fifty-two cards. The cards in each deck consist of four suits, namely spades (♠), clubs (♣), diamonds (♦)
Please solve the attached questions to do with expected value and standard deviation in a walking scenario.
Using the spread sheet that is attached, develop 95% and 99% confidence intervals for the following: The mean hours per week that individuals spend in their vehicles,the average number of miles driven per week, the proportion of individuals who are satisfied with their vehicle and the proportion of individuals who have at least
Question 1: A railway company operates a number of different services. One of these connects two cities and the journey time is assumed to be normally distributed with a mean of 125 minutes and a standard deviation of 5 minutes. The company operates a scheme where it refunds 25% of the fare paid if the journey takes longer t
Do you think the state has any intention of ever stopping the lottery, given the fact that the state relies on it to bring millions of dollars into its treasury? Is it possible that lottery can make everyone a millionaire? Is it ethical to suggest that the purpose of the lottery is to make everyone a millionaire? FORMAT I. I
1. According to an Ipsos poll, the perception of unfairness in the U.S. tax code is spread fairly evenly across income groups, age groups, and education levels. In an April 2006 survey of 1,005 adults, Ipsos reported that almost 60% of all people said the code is unfair, whereas slightly more than 60% of those making more than $
Given the research scenario, data points, set of population parameters and alpha set at p = .05, generate the correct: - Pair of hypotheses for each data point - A z statistic and p value for each data point - Decision about the null hypothesis for each data point - APA-formatted statement of results for each data point
In an online survey of 4,001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the Internet for its practical value (data extracted from M. Himowitz, "How to Tell What Kind of Tech User You Are," Newsday, May 27, 2007, p F6). Suppose you select a sample of 400 students at your
The U.S. Census Bureau announced that the median sales price of new houses sold in April 2008 was $221,600, and the mean sales price was $274,300 (www.census.gov/newhomesales, July 20, 2009). Assume that the standard deviation of the prices is $90,000.
Let X1, X2, and X3,... be independent identically-distributed Poisson (lamda) random variables. What is the value of P[Xn>n i.o.]? Does it depend on the value of lamda? (Be careful to justify your answer.)
Suppose you are playing Texas holdem and you hold the 8 and 9 of hearts. The flop comes the 3 of hearts, the jack of spades and the Queen of hearts. You now have an inside straight draw (needing a 10 for a straight) and a flush draw (needing a heart for a flush). a) What is the probability that you hit a straight or a flu
According to a report published by the Pew Research Center in February 2010, 61% of Millennial (Americans in their teens and 20's) think that their generation has a unique and distinctive identity (N=527) a. Calculate the 95% confident interval to estimate the percentage of Millennial who believe that their generation has a
You have been research for your statistics class on how nervous the American adults are in general, you have decided to use HINTS 2007 data set that has a scale (going from 0 to 24)measuring the psychological distress of the respondents. a. According to HINTS 2007 data, the average psychological distress score, for this sample
Elizabeth Bailey is the owner and general manager of Princess Brides, which provides a wedding planning service in Southwest Louisiana. She uses radio advertising to market her business. Two types of ads are available--those during prime time hours and those at other times. Each prime time ad costs $390 and reaches 8,200 people,
Suppose you are playing Texas hold'em poker and your two hole cards are the ace of spades and the king of spades. The flop is the two of spades, the seven of spades and the nine of clubs. Find the probability that you will draw a flush by the end of the hand.
Based on Questions tell whether True or False 1. For any normal distribution exactly 97.50% of the z-score values are less than z=1.96. 2. For any normal distribution, the proportion located between the mean and z=1.40 is 0.9192. 3. When determining the probability of selecting a score that is below the mean, you will get a
Suppose there are two types of Penn State Sports fans: Rabid (R), and Casual (R'). These fans either view a big game Live (L) or at Home (L'). Suppose 15% of Penn State fans are both Casual and watch the games at Home. If a fan watches at Home, the probability that he/she is Casual is 80%. Finally, suppose 10% of fans are Rabid.
Given that scores correspond with a raw score of 75.349, any individual with a raw score of 75.349 or higher would be included in your top 25%. If you have 100 scores, will this be the top 25 raw scores do you think? Why or why not?
Find the indicated probability. 1) A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170and 220. Solve the problem 2) For women aged 18-24, sy
(a) A student is taking a true-false exam with 20 questions. Assuming that this student guesses at all the 20 questions. (i) Determine the probability that this students gets either fourteen or sixteen answers correct. (ii) Approximate the probability obtained in part (i) by an area under a suitable normal curve. (b) (i) U
When someone buys a ticket for an airline flight, there is a 90% probability that a person will not show up for the flight. Air America books 15 people on a commuter flight that can only seat 13 passengers. What percent of the time will exactly 13 passengers show on time to be seated on the flight? What percent of the time
1. At a college, 70 percent of the students are women and 45 percent of the students receive a grade of C. About 30 percent of the students are female, but not C students. Use this contingency table. (See attached file) If a randomly selected student is male, what is the probability he is a C student? 2. The contingency tabl
A random sample of 20 people found that the number of mail-order catalogs that each had received in the last month were (in order from lowest to highest): 0 0 1 3 5 8 8 9 9 14 17 21 25 29 32 38 43 48 57 62 a) find the range, mean, median, and mode of the data set b) find the sample standard deviation. c) construct a hist
Briefly describe both the statistical measurements of discrete and continuous. Select one level of measurement and explain its relationship with statistical measurement.