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Light Bulbs: A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 750 hours. A random sample of 25 light bulbs has a mean life of 745 hours. Assume the population is normally distributed and the population standard deviation is 60 hours. At α = 0.02, do you have enough evidence to reject the manufacturer's claim?
Assuming 7 classes with a class interval width of 4, plot the data and construct a curve. What type of distrubtuion is indicated by the curve?
Find the sample space S for this experiment.- List the outcomes in each of the events A, B, C, and D.- List the outcomes in the events C ∪ D and C ∩ D.
The mean salary offered to students who are graduating from Coastal State University this year is $24,275, with a standard deviation of $3643.
Calculate an approximate sample size that we may use in this situation.please can you solve it in details with the steps
An Internet report of a survey's results included a disclaimer that the sample was obtained in a purely "random, unscientific" way
What type of test is needed to analyze the data? What is the hypotheses (including the symbols used to state the hypothesis)?
Never forget that even small effects can be statistically significant if the samples are large. To illustrate this fact, consider a sample of 88 small businesse
A random sample of 64 employees is taken. What is the likelihood that the sample mean will be 9 hours or more?
a local real estate investor in orlando is considering five alternative investments a day spa a theater a restaurant a
What is the probability that the jockey weighs more than 53 kg - What is the probability that the jockey weighs between 50 and 54 kg?
Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all ten questions, what is the probability he answers at least half correctly?
Suppose that you have a sample mean of 49 and a standard deviation of 3, but now found those values from a sample of 20 observations. test the hypothesis allowing for type 1 error to equal .05.
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