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Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud-the practice of someone clicking on an ad solely for the purpose of driving up advertising revenue-has become a problem. According to BusinessWeek 41 % of advertisers claim they have been a victim of click fraud. Suppose a simple random sample of 300 advertisers will be taken to learn more about how they are affected by this practice. Use z-table.
a. What is the probability that the sample proportion will be within 0.05of the population proportion experiencing click fraud? (to 4 decimals)
b. What is the probability that the sample proportion will be greater than 0.49? (to 4 decimals)
She plans on bringing three of the seven books with her in a road trip. How many different ways can the three books be selected?
suppose the equation of the regression line for the debt per capita for the years 1990-2001 is computed to be debt per
Use a significance level of 0.05. Comment on your conclusion: Are you saying that the percentage of dangerous fish is definitely 20%? Explain.
At the 0.01 level, is the bank loan financially sound (should the bank ask for additional collateral)? What is the decision rule?
Data are recorded on effects of each drug. Is research division by using dependent or independent samples? Explain why?
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86.
(a) Identify the null hypothesis and the alternative hypothesis.
If the company wishes to estimate, within 2 percentage points and with 99% confidence, the percentage of employees who are interested in participating in a new stock option benefits program, how large a simple random sample will be necessary?
What about drawing a random sample only from cell phone exchanges? Discuss the advantages and disadvantages of such a sampling method compared with surveying randomly generated telephone numbers from non - cell phone exchanges.
1.an experiment was performed to investigate lifetime of a component exposed to high heat. three different oven types
Develop a stem-and-leaf chart. Note: A typical row for the Stem & Leaf plot might look like 3ê0269. Where, the vertical line is obtained by using "Shift & |\" key. The line is inserted at the location of the cursor.
There is a statistical deception here. Explain what is deceptive about the bar graph.
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