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A lighting vendor has described its incandescent bulbs as having normally distributed lifetimes with a mean of 2000 hours and a standard deviation of 100 hours. The vendor is faced with an especially demanding industrial customer who insists on conducting a longevity test before committing to a very large order. The customer's purchasing department plans to test a simple random sample of 16 bulbs and to place the large order only if the sample mean is at least 2050 hours.
Given the longevity of the vendor's bulbs and the test the potential customer will be carrying out, what is the prob- ability that the vendor will get the contract?
write up answers 1-2 pages in length to each of the following.1. the essential components of hypothesis testing are the
Approximately 65% of all marketing personnel are extroverts, whereas about 50% of all computer programmers are introverts.
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
1.suppose we toss a penny and a nickel. let a be the event that the penny is a head and b be the event that the nickel
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
if a homecoming committee of 3 is to be chosen at random from a class of 13 students what is the probability of any
How many returns must he get in order to know the proportion that will support the bond issue within a standard error of 5% and a confidence level of 95%?
mean micro of 250 screws and a standard deviation ? of 8.30.find the probability that production will go below 238
The probability that Luis will pass his statistics test is 0.44. What is the probability that he will fail his statistics test?
use the frequency distribution table to construct a probability distribution. 12- the number of hits per name played by
A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the school's students
Determine the margin of error in estimating the population mean. a sample of 68 college students yields a mean annual income of $3248.
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