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Suggest the following linear trend equation of an industry's sales: yt = 120 + 12 t where t is measured in years and sales are measured in millions of dollars. Which is the most reasonable conclusio
Determine the area under standard normal curve between z= -0.5 and z= 0.5.
Many people think that the national lobby's successful fight against gun control legislation is reflecting the will of a minority of Americans. A previous random sample of 4000 citizens would need t
Which of the following would be most useful in checking the normality assumption of the errors in a regression model?
Using the sample of 63 observations, two variables X1 and X2 are regressed against the dependent variable Y yielding the fitted regression equation Y = 76.40 - 6.388 X1 + 0.870 X2. The standard erro
In determines the areas under the normal curve, if we wish to find out the area between A and B, and A is less than the mean while B is greater than the mean
In determining the areas under the normal curve, if we wish to determine the area between A and B, and both A and B are greater than the mean (with A further away from the mean than B)
Fuel economy determines for automobiles built in the certain year predicted a mean of 25.2 mpg and a standard deviation of 5.8 mpg for highway driving. Assume that a normal distribution can be appli
For specific truck traveling at 50 miles per hour(mph), the distance x needed brake to complete stop is basically distributed with mean of 120 feet and standard deviation of 12 feet. Assume that thi
What maximum time limit must be set for this test if it is desired to have no more than 8% of test takers fail to finish the test throughout that time limit?
Data gathered over the long period of time show that the length of time x to complete a specific college entrance test is normally distributed with average of 125 minutes and standard deviation of 1
The average time the subscriber spends reading local newspaper is 49 minutes. Assume the standard deviation is 16 minutes and that the times are normally distributed. Determine the probability the s
Assume that the random sample of size 20 is taken from normal distribution with unknown mean and known variance equal to 1, and the mean is found to be x ? = 10. A normal distribution was used as th
A plant manager knows that number of boxes of supplies received weekly is normally distributed with a mean of 200 and a standard deviation of 20. What percentage of the time will the number of boxes
Determine the point estimate of the population mean and margin of error for the confidence interval.
If other factors are held constant, what is the effect of increasing the sample variance on t-test?
Lottery A state lottery randomly selects 6 balls numbered 1 to 40. You select 6 numbers and purchase a lottery ticket the random variable represents the number of matches upon your ticket to the num
A sample has a mean of M = 63 and a variance of s2 = 36. If sample size is n = 4, what is the sample standard deviation (s)?
A company hopes to enhance customer satisfaction, setting as goal "less than 5% negative comments". A random survey of 350 customers found only ten with complaints. Does this provide evidence that
According to the study of 200 samples of ground meats, the probability that one of the samples was contaminated by salmonella was .35. The probability that the salmonella-contaminated sample was con
Determine a 95 % confidence interval for the mean maximum sentence of all murders. Assume a population standard deviation of 20 months.
Assume that the drying time for certain kind of paint under specified test conditions is known to be normally distributed with mean 75 minutes and standard deviation 5 minutes.
Assume 20% of all heart transplant patients do not survive the operation. Think about taking repeated random samples of 371 patients from this population.
You wish to estimate the proportion of adults that have ever used alternative medicine. Obtain a sample size that will ensure a margin of error of at most 0.01 for a 95% confidence interval.
You want to investigate attitudes of students at your school toward the school's policy on sexual harrasment. you have a grant that will pay costs of contacting about 500 students.