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The sample of six college wrestlers had the average weight of 276 lbs. with the sample standard deviation of 12 lbs. Determine the 90% confidence interval of true mean weight of all college wrestlers.
Statistics and Probability, Statistics
A student is gathering data on the driving experiences of other college students. One of the variables measured is the type of car the student drives. These data are coded using the following method: 1 = subcompact, 2 = ...
In a sample of 12 kids, their mean time on the internet on the phone was 3.9 hours with a standard deviation of 0.7 hours. Which distribution would be most appropriate to use?
Jen and Barry perform a survey of consumers about home meal salad preferences ("fresh" or "fast"). 395 consumers said they prefer to make fresh salad. 426 said they prefer to make salad fast (out of a bag). 331 said they ...
Alphonse contributes $542 per year at the end of each year to his pension plan. Assuming he can earn 6.62 per year from his plan, what is the total valve of his account at the end of 7 years?
100 people are invited to the party. Each guest is estimated to eat 0 or 1 or 2 sandwiches with probabilities 0.2,0.50.3 respectively. How many sandwiches should be ordered ro be approx 90% confident that there will be e ...
The distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal with mean 7.7 ounces and standard deviation 0.2 ounces. a) What is the probability that the average weight of a random sam ...
Your supervisor comes to you and says she would like a marketing research study. She says there is a budget of $30,000. She would like to conduct a simple random sample of consumers interested in using the services of th ...
Suppose the chance of selecting a female adult at random in the population is exactly π= 0.5 (ie: 50%). What is the probability that I choose 10 adults at random and I get the number of females in the sample to be betwee ...
Which level of risk considers sources of danger or uncertainties that have a direct and model-wide impact?
The number of people arriving for treatment at an emergency room can be modeled by a Poisson process with a mean of 7 people per hour. How many people do you expect to arrive during a 55-minute period?
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
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