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A sample of 25 light bulbs revealed that the average life span was 855 hours with a standard deviation of 130 hours. Assuming a normal distribution for the lifespan of the population of light bulbs, test the claim at a .01 level of significance that the mean life span of the population of light bulbs is less than 865 hours.
a) State the claim
b) State the Null Hypothesis:
c) State the Alternative Hypothesis:
d) Determine the type of test used:
e) Determine the critical value(s) CV
f) Find the Test statistic (TS):
g) Decision and conclusion
question the associated press reports that the mean trading volume for equity and index options contracts was 3.6
Assume the company wants to use a 0.05 significance level to test the researchers claim.
1.when using past data i have found that the proportion of items rejected by quality control personnel is about 3. we
1. A math student is interested in the number of credit cards owned by college students. She surveyed all of her classmates to collect sample data.
Measurements were taken on the length of call (defined as the difference, in seconds, between the time the person answers the phone and the time he or she hangs up). Analyze the data and compare the three independent groups of callers.
Each customer has probability p of being a home owner independently of all other customers. Let Y be the number of home owners registered. Show that Y~Poisson.
Which British institution was given independence from the government in 1997, four days after the Labour Party won the general election?
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
What justi?es the inclusion of a disturbance or error term in regression analysis?
That is, find the 80th percentile, which is the X that represents the weight of the suitcase. Assume that the variable is normally distributed.
Ghosts. A May 2001 Gallup Poll found that many Americans believe in ghosts and other supernatural phenomena. The poll was based on telephone responses from.
the number of calls received by a phone operator at an emergency department between 10-11am has a poisson distribution
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