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The incomes in a certain large population of electricians have a Normal distribution with mean $60,000 and standard deviation $8000. Four electricians are selected at random from this population to be shipped to another region.
A. The distribution of the mean, x-bar, is Normal with mean $30,000 and standard deviation $8000.B. The distribution of the mean, x-bar, is Normal with mean $15,000 and standard deviation $8000C. The distribution of the mean, x-bar, is Normal with mean $60,000 and standard deviation $2,000.D. The distribution of the mean, x-bar, is Normal with mean $60,000 and standard deviation $4000.
Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the 0.05 significance level, can we conclude that the mean waiting time is less than three minutes?
Estimate and interpret the p-value of the calculated test statistic above.
The data below are the numbers of hours of homework done as reported by 24 high school juniors for the last week in September 2006.
An engine system consists of three main components in a series, all having the same reliability.
Five children under twelve are selected at random. The probability that the average number of hours that they spend each week watching television is at least 30 is about?
Gerald takes the ACT mathematics test and scores 23. ACT math scores are Normally distributed with mean 22.4 and standard deviation 4.2. Find the standardized scores for both students.
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all worker's mileage is a Normal Distribution that ranges from 4 miles to 26 miles?
At a certain college, there were 700 science majors, 100 engineering majors, and 500 business majors. If one student was selected at random, the probability that they are an engineering major is?
When solving a quadratic equation using the quadratic formula, it is possible for the b2 - 4ac term inside the square root (the discriminant) to be negative, thus forcing us to take the square root of a negative number.
ACME Lumber Company selects a random sample of 36 customers. Customers are rated on their annual spend at ACME Lumber Stores.
A person's body temperature is found to be 101.00 °F. Is the result unusual? Why or why not? What should you conclude? What body temperature is the 95th percentile?
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