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An official of the Iowa Department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2 with a standard deviation of 1.114 months. The official review 35 road stripes. For King Paint, the mean number of months was 37.0 with a standard deviation of 1.3 months. The official reviewed 40 road stripes. At the .01 significance level is there a difference in the useful life of the two paints? Compute the p-value.
Critically discuss the lower control limit for a proportion defective if the average daily production is 5000 units and the average fraction defective is .02?
Mention your decision regarding the null hypothesis. If H 0 rejected can we conclude that treatment 2 and treatment 3 differ? Use 95 percent level of confidence.
A radio station that plays classical music has a "By Request" program each Saturday night. The percentage of requests for composers on a particular night are listed below:
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles.
A share tipping service claims that its selections give an average return of 10% if held for 12 months. An investor wants to investigate this claim and records the returns of the last 20 shares that have met the 12 month period.
If Accrotime guarantees full refund on any defective watch for 2 years after purchase, determine percentage of total production will company expect to replace?
Evaluate percentage of households in town with one or more cars; attach standard error to be evaluate. If this is no possible, describe why not.
In a certain city, 50 percent of the people consider themselves conservative (C), 25 percent consider themselves liberal (L), and 25 percent consider themselves to be independent (I).
Thirty percent of the population in a southwestern community are Spanish-speaking Americans. A Spanish-speaking person is accused of killing a non-Spanish speaking American.
What is the best prediction for the number of products sold based on advertising costs of $7000?
Past studies have revealed that only 88% of booked passengers actually arrive for flight.) Determine probability that if airline books 17 persons, not adequate seats will be available.
How might you go about creating a stronger regression model? For example, you have a multiple regression model with an adjusted R-Square of 0.49, which would explain 49% of the variance of the dependent measure
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