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1. A local cable TV company, with customers in 15 towns is considering offering high-speed Internet service on its cable lines. Before launching the new service they want to find out whether customers would pay the extra $50 per month they plan to charge. An intern has prepared several alternative plans for assessing customer demand. For each, indicate what kind of sampling strategy is used.
a) Randomly select 20 customers from each town. survey these customers and combine the results into one sample.
b) Randomly select one of the towns and contact every cable subscriber in this town.
2. A consumer group wants to test a new brand of laundry detergent. They take pieces of white cloth and stain each with the same amount of grease. The cloths are washed in one of three water temperatures ( cold, warm, hot) using either a standard detergent or the new detergent. An optical scanner is used to measure the whiteness of the cloth ( on a scale 1-10) after washing.
a) Identify the response variable for this experiment:
b) Identify the factors:
c) How many treatments are there?
What can you conclude from chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches? Show all work.
If a random sample of 40 customers is taken, what is the probability that the sample average expenditure per customer for this sample will be 87.00 or more?
a clinical trial is conducted to investigate the effectiveness of an experimental drug in reducing preterm delivery to
Index number acts as a barometer for measuring the value of money. What are the characteristics of an index number? State its utility.
q1. records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed with a
Compute the coefficient of determination for bone loss and women's age and describe what this statistic means.
What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test (to 4 decimals)?
a retail store in des moines iowa receives shipments of a particular product from kansas city and minneapolis. letx
Explain the assignment model and how it is similar to a transportation problem. Give a real-world example of an assignment model to describe what is transported where.
The average amount of time between a score by either team in college soccer games is 15.2 minutes.
What percent of the Fords traveled 62.000 miles or less during the year?
The Central Limit Theorem states that the sampling distribution of means is:
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