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According to the National Restaurant Association, 20% of fine-dining restaurants have instituted policies restricting the use of cell phones. From a sample of 100 fine-dining restaurants,
a) What is the probability that the sample has between 15% and 25% of restaurants that have established such policies?
b) The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Based on the sample findings, estimate the true mean of Saturday sales with 90% probability.
Compute test statistic for sample data that you would use to test whether sample mean varies from population mean of 10 pounds at a 5 percent level of significance in two-tailed test.
When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 100
What factors might cause the company to order a larger or smaller amount than the EOQ?
What are the endpoints of a 95 percent confidence interval for the proportion defective. (Round your answers to 3 decimal places).
Can one conclude at a level of significance of .01 that the new ball has improved his game?
A loan application is received this morning. What is the probability that:
A market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser based on the shape and color of the container. Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name.
The moment generating function of normal distributed random variable ,Y, with mean and variance .derive the moment generating function of X=-3Y+4.what is the distribution of X? why?
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
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