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Past surveys reveal that 30 percent of tourists going to Las Vegas to gamble spend more than $1,000. The Visitor's Bureau of Las Vegas wants to update this percentage.
The new study is to use the 90 percent confidence level. The estimate is to be within 1 percent of the population proportion. What is the necessary sample size?
The Bureau feels the sample size determined above is too large. What can be done to reduce the sample? Based on your suggestion, recalculate the sample size. (Hint: Use an allowable error in the range of 0.01 to 0.05)
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
mr. smith was admitted to the hospital for surgery on his left knee. when mr. smith woke up from the anesthesia he
The manufacturer has to replace or exchange 10% of its model I and 18% of its model II. If a model is selected at random, find the probability that it will be defective?
what is indicated by a large variance for a sample of difference scores?a consistent treatment effect and a high
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes. Assembly times can vary considerably from worker to worker, and the company decides to eliminate this effect by selecting a random samp..
suppose the amount of time it takes a popcorn kernel to pop is normally distributed with a mean of 150 seconds and a
a spinner is divided into 4 equal spaces. a player bets 2.00 on a given space. if the spinner lands on that space he is
What is the probability that the sample proportion will be within +/- .03 of the population proportion if a sample of size 1,200 is selected?
The store manager is under impression that his sales people do more business if they score higher on the social skills test which was administered this year. 5 victims were selected at random. Below, the results are X =test score, Y =weekly sales ..
Total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
question 1the monthly average sales of the smiling ninja computer company may be approximated to a normal distribution
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