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It is found that on average each person who regularly visits the bar spends about $2500 per year in the bar with a standard deviation of $450. Construct a 99 percent confidence interval around the
A person has applied for positions at Company A, Company B and Company C. The probability of obtaining an offer from Company A is 0.4, from B is 0.3 and from C is 0.6. Assume that the three jobs of
The researcher wants to know if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A. than in Germany. What is the decision at
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 10% of the products to weigh mo
The fill volume of an automated filling machine used for filling cans of carbonated beverage is normally distributed with a mean of 12.2 fluid ounces and a standard deviation of 0.1 fluid ounce.
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least ho
Cooking oils that are low in both cholesterol and saturated fats are often recommended for people who are trying to lower their blood pressure or to lose weight. Many cooking oils that have no chole
Calculate a 99% two-sided confidence interval on the proportion of such tears that will heal. Round the answers to 3 decimal places. Calculate a 99% lower confidence bound on the proportion of such
A city council consists of 7 males and 4 females. Two councilors are selected at random to represent the city. What is the probability that
In a test of hypotheses, a researcher used the level of significance a = .05. Based on a random sample, she obtained a P-value of 0.052. Which of the following is true?
The average hourly wage of workers at a fast food restaurant is $6.50/hr with a standard deviation of $0.45. Assume that the distribution is normally distributed. If a worker at this fast food rest
For a normal curve with mean 15 and standard deviation 1.5, which of the following parts of the normal curve will have an area of approximately 68%? Answer from 6.5 to 19.5 from 5 to 11 from 13.5 to
Mr. Fix's reading class can read a mean of 181 words per minute with a standard deviation of 18 words per minute. The bottom 25% of the class will be placed in a special remediation class to assist
State the null and alternative hypotheses: Determine the test statistic from minitab: Determine the p-value from minitab:
The population mean grade is 78, with a standard deviation of 6 points. Determine the sample size needed to detect an increase of 5 points. Let ? = 0.02 and ? = 0.05 (10 points)
State the null and alternative hypotheses: Give the point estimate for the proportion of people who passed the test:
The error term is the difference between the observed value of the dependent variable and the predicted value of the dependent variable.
List Ho and Ha (Note : Remember you are not testing the mean, so "Y" should not be used). Find the critical value(s). Find X(2), the standardized test statistic
You wake up on Saturday morning and your roommate is not home. What is the probability that he is in jail?
Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 145 minutes with a standard deviation of 16 minutes. Consider 49 of the races. Let X-bar = the
If the test indicates that a person does not have the disease, what is the probability that the individual actually has the disease?
An applicant needs a minimum combined score of 1500 to gain admission. What percentage of applicants meet or exceed the minimum qualification?
A manufacturer of semiconductors has a 20 % defect rate in the semiconductors produced. Every hour, fifteen semiconductors are selected at random and inspected for defects. If more than two defectiv
The number of goals scored in a hockey match between the home team (X) and the visiting team (Y), respectively follows each of the probability distributions given below: