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You want to compare the daily sales for two different designs of Web pages for your internet business. You assign the next 62 days to either Design A or Design B, 31 days each. The summary statistics for the test are shown in part (d) on the next page. Suppose Design A is the current design and Design B is a proposed new design. The hypothesis is that Design B is superior to Design A.
a) Would you use a one-sided or two-sided test for this example.Why?
b) State the null and alternative hypothesis corresponding to your answer for (a).
c) What would the critical value be? Use α = 0.05
d) Suppose the following output is obtained from Excel. Conduct the significance test corresponding to your answer to (b) above. What is the result of the significance test? SOLVE AND INTERPRET CLEARLY AND THOROUGHLY.
In recent years the irradiation of food to reduce bacteria and preserve the food longer has become more common. A company that performs this service has developed four di erent methods of irradiating food. To determine which is best, it conducts a..
An engineering research center claims that through the use of a new computer control system, automobiles should achieve, on average, an addition 3 miles per gallon of gas. A random sample of 100 automobiles was used to evaluate this product
For a particular regression analysis, it is found that SST = 800.0 and SSE = 300.00. Calculate the coefficient of determination.
1. Do this exercise by hand. A famous brand-name manufacturer wants to know whether people prefer Nibbles or Wribbles. They sample each type of cracker and indicate their like or dislike on a scale from 1 to 10. Which do they like the most?
a) Explain why ground-wave propagation is more effective over sea water than dessert terrain. b) Why do stations in the AM broadcast band always use vertically polarized antennas
80% of those who take a certification exam pass it. Assume binomial distribution applies. 15 people have registered to take the exam in June. What is the probability that exactly 12 of them will pass the test?
Design that examines the effects of region of residence in northeast, south, mid-west, and west and income that is low, medium, and high
Ebola Test Kit Evaluation
What is the approximate minimum percentage of data in any frequency distribution that lies within 3 standard deviations of its mean?
Discuss the level of measurement, assumptions that can be made, statistics that can be calculated from these data, and the general quality of the data
What was the total number of participants surveyed for the study and what was the total number of participants who completed the entire survey?
Tim is a plumber who joined a barter club. This year Tim exchanges plumbing services for a new roof. The roof is properly valued at $2,500, but Tim would have only billed $2,200 for the plumbing services. What amount of income should Tim reco..
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