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Confidence interval for the population mean: Use of the t distribution.
A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests 10 children selected at random and finds that their mean attention span is 33 minutes with a standard deviation of 6 minutes. If we assume that attention spans are normally distributed, find a 90% confidence interval for the mean attention span of children playing with this new toy. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
What is the lower limit of the confidence level?
What is the upper limit of the confidence level?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
The Martin Company is in the process of planning for new production facilities and developing a more efficient distribution system design. At present, it has one plant at St.Louis with a capacity of 30000 units.
Determine the most economical monthly shipping schedule. Provide a table showing the routes and total costs.
Determine the probability that exactly 8 of them started smoking before 18 years of age.
Assume the population standard deviation is 1.2 hours. The standard error of the mean is:
Use the table to determine whether the correlations are significant and how you would interpret the results. The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.
The amount of time a bank teller spends with each customer has a population mean = 3.1 minutes and population standard deviation = 0.4 minute.
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
Compare the two forecasts computed in (a) and (b), using MAD. Which one should the dealer use for January of the next year?
Determine the probability of having more than 3 defects in a roll?
Recognize the given samples are independent samples or matched pairs.
You took a sample of your expenses for 20 weeks and found that the average is $285 and the standard deviation for the sample is $25. Set up your null and alternative hypothesis for testing whether your cists are different and do the analysis using..
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