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An automobile parts supplier manufactures a cylindrical engine part. The part is supposed to have an outside diameter of four centimetres. Parts with diameters that are too large or too small will not fit properly within the engine and must be discarded, resulting in a loss of time and materials. The quality control department routinely inspects the manufacturing process to determine if the parts are meeting the specification. The most recent random sample of 36 parts produced a sample mean of 4.005 cm. Assume that the population standard deviation of the diameter is known to be 0.014 cm. Is there sufficient evidence to suggest that the parts are not meeting the target diameter? Use the p-value method to conduct an appropriate hypothesis test at the 5% level of significance. Comment on the validity of your conclusion.
What is the probability that a randomly chosen package is improperly sealed?
How many business majors would be required to evaluate mean salary to within 10 with 95% confidence if population standard deviation is %200.
You are the manager in a small town in the lake district of a Midwestern state that enjoys a robust tourist season during the summer months but has only a small population of residents during the off season.
The pie chart below shows the distribution of the citizens' answers. If there are citizens in the community, how many chose Birds, Hamsters, or Dogs?
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female hispanic drivers in Boston
What types of variables are measured using Pearson coefficient, and what types variables are measured with chi square; I am looking for names of variables (e.g., nominal, interval)?
The seller offered free shipping to 25 customers for randomly selected products and then collected and reviewed the customers' approval scores. What type of statistical analysis is most appropriate to determine whether the offering of free shippin..
Shank's Inc., a nationwide advertising firm, wants to know whether the size of an advertisement and the color of the advertisement make a difference in the response of magazine readers.
a. Find the probability distribution of d1 and display it in a table. b. What is the expected value of d1? c. What is the value of the standard deviation of d1?
How could we rescreen for defective units from a population of 900 units and establish a 95% confidence that the whole 900 units are acceptable.? How many would we need to check out of the 900?
Each year Ms. Fontanez has the chance to invest in two different no-load mutual funds: the Go-Go Fund or the Go-Slow Mutual Fund. At the end of each year, Ms. Fontanez liquidates her holdings, takes her profits, and then reinvests.
suppose x has density function x2 for 0 lt x lt 2 and 0 otherwise. find the density function of y x2 - x by computing
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