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If 70 percent of the population of a large community is in favor of a proposed rise in school taxes, using the normal approximation to the binomial distribution, approximate the probability that a random sample of 100 people will contain (a) between 60 and 70 inclusive who are in favor; (b) fewer than 80 in favor.
assume that the number of students who successfully complete this course with a grade of lsquoc or better has a
A survey last week revealed that out of 400 viewers contacted, 94 watched the news on WBEN. Can we conclude that the percent of viewers has increased? Use the 0.05 significance level.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
Let sales be the independent variable and earnings be the dependent variable. Draw a scatter plot. Compute the coefficient of correlation Compute the coefficient of determination.
A recent article in The Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in percent):4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6
What is the probability that the total weight of eight people exceeds 1300 pounds? 1500 pounds? (Assume that the probability distribution is approximately normal).
a report issued by the american association of building contractors indicates that 40 of all home buyers will do some
a division within a transportation company is responsible for performing maintenance on the fleet of trucks used by the
Fip it 20 times and if it lands heads 17 times or more then the referee will designate that coin as the weighted one. a) If the coin the referee selects is fair, what is the probability that it gets designated as being weighted?
Calculate the sample mean, median, range, sample variance and sample standard deviation only for each of the four variables and explain what each value tells us about the motion picture industry.
Recall that in Exercise 45 the personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to length of service and wage rate.
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