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A hardware store has received two shipments of halogen lamps. The first shipment contains 100 lamps, 4% of which are defective. The second shipment contains 50 lamps, 6% of which are defective. Suppose that Emanuel picks a lamp (at random) off of the shelf and purchases it, and he later discovers that the lamp he purchased is defective. What is the probability that the defect came with the first shipment?
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
Create a 90% confidence interval for mean score on this placement exam for all students.
Is the dependent variable discrete or continuous? interval, or ratio) is used to measure the dependent variable?
Estimate a multiple regression model using revenue as your dependent variable. For independent variables, include population, average income, screens, theatre age, and dummy variables for mall and strip mall.
The manager for Select-a-Seat, a company that sells tickets to athletic games, concerts, and other events, has determined that the number of people arriving at the Broadway location on a typical day is Poisson distributed with a mean of 12 per hou..
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
State the decision rule. Compute the pooled estimate of the population varaince. Compute the test statistic
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
The perimeter of a rectangular painting is 344cm; if the width of the painting is 73 cm, what is the length?
What is the point estimate of the difference between the population mean expenditure for males and the population means expenditure for females?
if you assume returns follow a normal distribution, which investment has a better chance of giving you $40 million in returns.
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