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1) A survey of adults who attend at least one music concert a year found that 67% say concert tickets are too expensive. You randomly select 100 adults who attend at least one music concert a year. What is the probability that between 60 and 70 will say concert tickets are too expensive?
2) Suppose a random survey is conducted of 9 U.S. mothers who recently weaned their children. The average weaning age was 12.1 months with a standard deviation of 5.8 months. Conduct a hypothesis test to determine is the average weaning age in the U.S. is less than 12 months old. Use a 5% level of confidence.
In your answer, show your hypothesis your calculated z or t score , and your decision to accept or not accept the null hypothesis
How would you communicate this information to the Vice-President of Human Resources in non-statistical language.
Discuss the following questions: Of what use is intervention and prevention for this population? What needs to be done in the American justice system to combat crimes committed by the group you have chosen to study?
The auto parts department of an automotive dealership sends out an average of 8 special orders daily. The number of special orders is assumed to follow a Poisson distribution.
The West End Boutiques company was founded by Libbie Williams in 1990 with a single store in College Station, Texas, and the company now has 21 shops located in the triangle of Dallas, San Antonio, and Austin, Texas.
Marketing communications are the means by which firms seek to inform, persuade, and remind consumers-directly and indirectly-about the products and brands that they offer.
A random sample of 1000 daily newspapers found that on average, each edition contained 3.01 local crime stories per day, with a standard deviation of 2.65. Answer the following questions assuming that the distribution of crime stories in newspaper..
What is the purpose of a post-hoc test with analysis of variance? What is probabilistic equivalence? Why is it important?
A study was conducted to determine the tension needed by various types of guitar strings in order to produce the proper frequency.- Conduct the appropriate test to check the hypothesis of no difference in population mean tensions.
Confidence intervals for the population mean number of that color of M&Ms in a pack. You may assume that the M&M are approximately normally distributed. Which form of the formula did you use and why?
The probability distribution of the daily demand for a product is shown below. What is the expected number of units demanded per day? Determine the variance and the standard deviation.
Gino Petralli is an enterprising businessman. He is in the process of starting up a pizzeria. Specifically, he needs to know if 10 tables in his dining area is enough
For the telephone switch of Example 10.28, we can estimate the expected number of calls in the system, E[M(t)], after T minutes using the time average estimate
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