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Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis
The average age of doctors in a certain hospital is 51.0 years old with a standard deviation of 10.0 years. If 9 doctors are chosen at random for a committee, find the probability that the mean age
The average number of mosquitos in a stagnant pond is 100 per square meter with a standard deviation of 8. If 9 square meters are chosen at random for a mosquito count, find the probability that the
The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 0.70 centimeters. If 9 sand dollars are chosen at random for a collection, find the probabil
The average diameter of sand dollars on a certain island is 4.50 centimeters with a standard deviation of 0.70 centimeters. If 9 sand dollars are chosen at random for a collection,
In 1960, census results indicated that the age at which American men first married had a mean of 23.3 years. It is widely suspected that young people today are waiting longer to get married. A rando
A certain 12:00 noon pollution level was found to be normally distributed and to have a mean of 7.9 and a standard deviation of 1.1. What is the probability of having a level between 3.3 and 7.4 at
Pipe is manufactured with a mean diameter of 1.01 inches and a standard deviation of 0.003 inches. Find the probability that a random sample of size 9 sections will have a sample mean between 1.012
The power of this test(as a percent with two decimal place precision) for H1: mu=3.25 is Blank 2 What minimum sample size (as an integer) would be required to reject the null hypothesis if H1: mu=3.25
Find the probability that a random sample of size 7 sections will have a sample mean between 1.011 and 1 inches. Present the probability as a percent with two decimal place precision and no % sign.
A certain 12:00 noon pollution level was found to be normally distributed and to have a mean of 7.7 and a standard deviation of 1.5. What is the probability of having a level between 3.4 and 7.5 at
The life of a magnetic disk follows a Weibull distribution with beta 0.61 and delta 572. Find the probability that the life of a disk falls between 590 and 710. Give your answer as a percent with tw
The length of stay at a certain emergency room has a mean of 2.4 hrs and is exponentially distributed. What length of stay is exceeded by 29%. Give answer in hrs with a two decimal place precision.
A certain bubble gum company includes a picture card of a famous basketball player in each pack of bubble gum it sells. A complete set of cards consists of n players. Suppose that every pack you buy
In the US, it is reported that 72% of woman have some type of piercing. The most popular piercing location is the ear. A recent study reported the following statistics on the popularity of alternati
The average hourly wage of workers at a fast food restaurant is $6.50/hr with a standard deviation of $0.50. Assume that the distribution is normally distributed. If a worker at this fast food resta
You toss a fair coin until you get a head for the first time, and receive $2i if this occurs at trial i. You are allowed a maximum of N trials. If tails occurs at each of the N trials, you win nothi
A typical donation is one pint, so assuming the typical donation and that each person only donates once, what amount of O-negative blood could the Red Cross have expected? Is this a minimum or maxim
The average hourly wage of workers at a fast food restaurant is $6.50/hr with a standard deviation of $0.50. Assume that the distribution is normally distributed.
A mandatory competency test for college students has a normal distribution with a mean of 350 and a standard deviation of 110. The top 3% of the students will receive a $200 stipend. What is the min
If a case of light bulbs contains 1200 bulbs, and the probability that any one bulb is defective is 0.015, estimate the probability of each of the following using the normal distribution technique.
The amount of time necessary for assembly line workers to complete a product is a normal random variable with a mean of fifteen ( 15 ) minutes and a standard deviation of two ( 2 ) minutes.
The heights (measured in inches) of men aged 20 to 29 follow approximately the normal distribution with a standard deviation of 2.8 inches. A random sample of 16 American men aged 20 to 29 yields a
A business trip is equally likely to take 2 , 3 , or 4 days. Aftera d - day trip , the change in the traveler's weight,measured as an integer number of pounds, is uniformly distributed between -d an
A researcher measures the following scores for a group of people. The X variable is the number of errors on a math test, and the Y variable is the person's level of satisfaction with his/her perform