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Before accepting a large shipment of bolts, the director of an elevator construction project checks the tensile strength of a simple random sample consisting of 20 bolts. She is concerned that the bolts may be counterfeits, which bear the proper markings for this grade of bolt, but are made from inferior materials.
For this application, the genuine bolts are known to have a tensile strength that is normally distributed with a mean of 1400 pounds and a standard deviation of 30 pounds.
The mean tensile strength for the bolts tested is 1385 pounds. Formulate and carry out a hypothesis test to examine the possibility that the bolts in the shipment might not be genuine.
Kay Manning is a sales manager with two salespeople working for her. The ability of each salesperson to secure new accounts has historically been: Jesse Burkett can generate 4 new accounts per 10 visits to prospects
using the standard normal table find the proportions for the areas listed belowa. the area between z 0 and z 2.13b.
Research the topic of Job Satisfaction using the Business Source Premier Database (EBSCO) and/or the ABI Inform Global database from the Internet.
christine wong has asked dave and mike to help her move into a new apartment on sunday morning. she has asked them both
The amount of growth during a set 15-day period for a population of sunflower plants follows a normal distribution with μ=3.07 cm and σ=0.40 cm.
Determine the least-squares regression line for pre- dicting the percentage of males who are overweight based on the number of calories consumed per day.
which a correlation analysis or regression analysis could contribute to a better decision. The situation can be from a work, of general interest, or experienced in private life.
Plot four different regression graphs (X v Y): Tomatometer v Audience, Budget v Gross, Budget v Tomatometer, Audience v Gross and find the best-fit line equation and correlation coefficient (r-value) for each one. X represents the independent var..
if the same mean is 11 the hypothesized population mean 10 and the population standard deviation is 4 compute the test
Please show work and provide excel formulas for plots so that I can understand how to do the assignment. The density function of a continuous random variable X, the total number of hours, in units of 100 hours, that a family runs a vacuum cleaner ove..
What is the population of interest to the researcher?- Identify the sample.- What inference was made by the researcher?- How might the nonresponses impact the inference?
We modify the M/M/1/4 queueing system as follows: the server always waits until there are at least two customers in the system before serving them, two at a time, at an exponential rate μ.
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