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Supppose the replacement times for washing machines are normally distributed with a mean of 9.3 years and a standard deviation of 1.1 years. Find the probability that 70 randomly selected washing m
Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how do you use these three levels in relationship to evaluate
The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. Many school districts across the country seek to identify "Gifted and Talented" chi
The General Social Survey (GSS), conducted by the National Opinion Research Center at the University of Chicago, is a major source of data on social attitudes in the U.S. Once each year 1500 America
Find the smallest class size K for which the probability that two or more students have the same birthday exceeds 0.5.
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of $1100 and a standard deviation of $150. If an applicant is randomly selected, find the probabili
The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distributi
The serum cholesterol levels for men in one age group are normally distributed with a mean of 178.1 and a standard deviation of 40.7. All units ate in mg/100mL. Find the two levels that separate th
The number of calls received by a car towing service averages 21.6 per day (per 24-hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected ho
Suppose it is known that a transaction is for goods. Use the tabular form of Bayes theorem to find the probability that it is a cash transaction.
The amount of time necessary for assembly line workers to complete a product is a normal random variable with a mean of 15 minutes and a standard deviation of 2 minutes. 60% of the products would b
A mountain search and rescue team receives an average of 0.80 calls per day. Find the probability that on a randomly selected day. they will receive at most two calls.
A factory produces metal ships which average 1 defect per 25 feet. What is the probability that a randomly selected 50 foot strip has exactly three defects?
Many passengers on cruise ships wear skin patches that supply Dramamine to the body for the purpose of preventing motion sickness. A claim about the mean dosage amount is tested with a significance
You have applied to be an intern at company Big and company Huge. The personnel directors at Big and Huge have told you that the probabilities of getting the positions at their companies are 0.3 an
Scores on the SAt test have a mean of 1518 and a standard deviation of 325. Scores on the ACT test have a mean of 21.1 and a standard deviation of 4.8. which is relatively better: a score of 1840 o
In a 1-page memo to the Universal Credit product development team, indicate how many card holders should be sampled to meet the original requirements of the sample. Then explain the trade-offs that
A study is conducted to determine the amount of time customers spent using kiosks. The manager found that the amount of time closely follows a normal distribution with a mean of 500 seconds and a st
A November 2007 Gallup Poll of 1004 adults found that 572 are satisfied with the total cost they pay for their health care. The announced margin of error is ±3 percentage points. The announc
The number of cars, X, that pass through a certain intersection on any weekday is approximately normally distributed with a mean of 852 and a standard deviation of 143. The proportion of days when
Thirty-five sophomores, 39 juniors and 29 seniors are randomly selected from 475 sophomores, 517 juniors and 550 seniors at a certain high school. What sampling technique is used?
We wish to determine if there is sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the value of the test statistic.
An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately normal with mean 530 and standard deviation 80. Abo
A tobacco company claims that the amount of nicotine in its cigarette is a random variable with mean 2.2 mg and standard deviation .3 mg. In an examination, the sample mean nicotine content of 100 r
If you were president of the college you are attending and were employing goal programming to assist in decision making, what might your goals be? What kinds of constraints would you include in you