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The makers of a soft drink want to identify the average age of its consumers. A sample of 55 consumers was taken. The average age in the sample was 21 years with a standard deviation of 4 years.
a. Construct a 95% confidence interval for the true average age of the consumers.
b. Construct an 80% confidence interval for the true average age of the consumers.
c. Discuss why the 95% and 80% confidence intervals are different.
Find the probability that on a given shift: (1) Exactly 2 workers will be absent; (2) More than 4 workers will be absent. [Given that e to the power of -3 is equal to 0.04979]
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with α=.05.
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
Choose the correct answer using sum of squared error (SSE).
A technician services machines as companies in the Phoenix area. Depending on the type of malfunction, the service call can take exactly 1, 2, 3, or 4 hours. The different types of malfunctions occur at the same frequency.
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
Find the probility that a randomly selected student has neigther credit card. Find the probability that a randomly selected student has a Mastercard or a Visa or both.
In a randomly controlled trial conducted with children suffering from croup, 46 randomly selected children were treated with ow humidity while another group of randomly selected children were treated with high humidity.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
What is the coefficient of x^5 in the polynomial -8x^5+0x^3+14? Find the slope of the line that contains points (-4,-2) and (1,1)
telephone calls arrive at the information desk of a large computer software company at a rate of 15 per hour.a what is
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. Find the probability that the family's monthly gasoline purchases will be between 86 and 96 gallons.
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