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The American Restaurant Association collected information on the number of meals eaten outside the home per week by young married couples. A survey of 100 couples showed the sample mean number of meals eaten outside the home was 3.45 meals per week, with a standard deviation of .75 meals per week.
a) Construct a 99% confidence interval for the population mean.
b) How would the interval change if you lowered the confidence level from 99% to 95%?
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
Find the probability that all 3 ignition systems are good.d- which is better: the answer from part (b) or the answer from part (c)? why?
The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.
The average cost of a gallon of regular unleaded fuel at gas stations nationwide was $3.23, with a standard deviation of $0.23. Assume the national average holds for Connecticut. What is the probability that a sample of 30 gas stations in Conne..
Make three-month and four-month moving averages for this time series. Does the three-month or four month moving average provide the better forecast? Explain.
Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.
The mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
Four movies are randomly selected. Their lenghts were 110, 96, 125, and 136 minutes. Find a 95% confidence interval of the average of the lenghs of the movie.
What is the chi-square goodness of a fit test? What is its purpose? What does it measure? Is there a way of telling when the test is over?
What is the probability the circuit will last more than 3000 hrs. What is the probability the circuit will last between 2500 and 2750 hours and what is the probability the circuit will fail within the first 2000 hrs.
the population of iq scores forms a normal distribution with a mean of micro 100 and a standard deviation of o
A research team conducted a study of soft- drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers and 130 are adults. The researchers secured the following re..
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