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Advertisers. Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy the company's product. The re- sponse rate is usually quite low. Suppose a company wants to test the response to a new flyer and sends it to 1000 peo- ple randomly selected from their mailing list of over 200,000 people. They get orders from 123 of the recipients.
a) Create a 90% confidence interval for the percentage of people the company contacts who may buy something.
b) Explain what this interval means.
c) Explain what "90% confidence" means.
d) The company must decide whether to now do a mass mailing. The mailing won't be cost-effective unless it pro- duces at least a 5% return. What does your confidence in- terval suggest? Explain.
What is the mean of this uniform distribution? What is the standard deviation?
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
That the requirement is NULL AND VOID. To be PROVED UNWORKABLE and sink like the Titanic? It is WORTH a little delay to have such a desirable result, isn"t it?
Two sets, and 18% have three or more sets. If two households are chosen at random, what is the probability that at least one has a television set?
assume that a simple random sample has been selected froma normally distributed population and the test given
two students a and b are both registered for a probability class. neither student has a sterling attendance pattern.
The times that picture tubes operate until failure can be viewed as independent random variables. The company sells 100 television sets in a given period.
Let the null hypothesis be the landlord association claim and the alternative hypothesis be the housing authority claim. Doe the data support the landlord's association claim? What would you report to the housing authority?
Decide if the events A and B are mutually exclusive or not mutually exclusive. A card is drawn from standard deck of 52 playing cards.
Range from 5 to 30 rounds. Rounds.) Insert a 10 round.. Does this make it a different firearm?? You add the single shot rifle round adapter to it?? Different gun, based just on the magazine capacity (now 1)??
Use the p value method to determine whether or not to accept or reject the null and alternate hypotheses.
Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters.
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