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First USA, a major credit card company, is planning a new offer for their current cardholders. The offer will give double airline miles on purchases for the next 6 months if the cardholder goes online and registers for the offer. To test the effectiveness of the campaign, First USA recently sent out offers to a random sample of 50,000 cardholders. Of those, 1184 registered.
a) Give a 95% confidence interval for the true proportion of those cardholders who will register for the offer.
b) If the acceptance rate is only 2% or less, the campaign won't be worth the expense. Given the confidence interval you found, what would you say?
hiv infection among intravenous drug users. found that 40 light users and 55 were heavy users were hiv positive.1
a team of scientists is due to spend six months in antarctica carrying out research. one major piece of equipment they
a research study has stated that the taxes paid by individuals is correlated at a .78 value with the age of the
Quality Control A quality inspector checked for imperfections in rolls of fabric for one week. The random variable x represents the number of imperfections found.
Find values for the interval x‾ ± 2s, and explain why the result is evidence that the distribution of weekly hours spent using the computer is not bell-shaped.
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
What proportion of the assemblies will be nonconforming, assuming a normal distribution of the piston and cylinder diameters? Clearances more than 0.8 cm are undesirable. What proportion of the assemblies will not meet this stipulation?
suppose a committee of 3 people is to be selected randomly from a group consisting of 4 men and 5 women. what is the
A political telephone survey of 260 people asked whether they were in favor or not in favor of a proposed law. Each person was identified as Republican or Democrat. The following contingency table shows the results.
It's your first day at the Jedi Temple, working as a lightsaber manufacturer. Your first task on the job is to analyze the control and capability of this process. Your main concern is to see if the lightsabers fit within the required length specif..
Refer to Questionnaire color Problem 16.8 Explain how you would make the random assignments of supermarket parking lots to color in this single-factor study. Make all appropriate randomizations.
if a random variable can take on a countable number of values one would use a discrete
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